photoshop cs4基础知识在学习photoshop之前,应先对图像的基本（Photoshop CS4 basic knowledge, before learning Photoshop, we should first of all the basic image）

photoshop cs4基础知识在学习photoshop之前,应先对图像的基本（Photoshop CS4 basic knowledge, before learning Photoshop, we should first of all the basic image） photoshop cs4基础知识在学习photoshop之前,应先对图像的基本(Photoshop CS4 basic knowledge, before learning Photoshop, we should first of all the basic image) PS图象处理软件基础知识CS4 在学习PS图象处理软件之前，应先对图像的基本概念和色彩模式有一个基本的了解，然后再熟悉工作界面的组成、系统的优化设置以及PS图象处理软件中的一些图像编辑辅助工具等。掌握这些基本知识，将有助于对软件的整体了解和学习本章将对图像处理的基本概念、PS图象处理软件的工作界面、系统的优化设置和图像辅助工具等知识进行详细介绍CS4。 1.1图像处理的基本概念 PS图象处理软件是如今处理图像最为强大的软件，在学习软件的操作方法前，应对图像的基本概念有一定的认识和了解。下面将对图像的基本概念进行详细介绍。 1.1.1像素和分辨率 PS图象处理软件的图像是基于位图 格式 pdf格式笔记格式下载页码格式下载公文格式下载简报格式下载 的CS4，位图图像的基本单位是像素，在创建位图图像时需为图像指定分辨率大小图像的像素与分辨率均能体现图像的清晰度，下面将分别介绍像素和分辨率的概念。 1。像素 像素由英文单词像素翻译而来，它是构成位图图像的最小单位，是位图中的一个小方格。如果将一幅位图看成是由无数个点组成的，每个点就是一个像素。同样大小的一幅图像，像素越多的图像越清晰，效果越逼真。如图1-1所示为100%显示的图像，当将其放大显示到足 够大的比例时就可以看见构成图像的设计方格状像素，如图1-2所示。 图1-1 100%显示的图像图1-2放大显示像素 2。分辨率 分辨率是指单位长度上的像素数目。单位长度上像素越多，分辨率就越高，图像就越清晰分辨率可分为图像分辨率、打印分辨率和屏幕分辨率等，其含义分别如下。 ,图像分辨率:图像分辨率用于确定图像的像素数目，其单位有”像素/英寸”和”像素/厘米”。如一幅图像的分辨率为300像素/英寸，表示该图像中每英寸包含300个像素。 ,打印分辨率:打印分辨率又称输出分辨率，指绘图仪、激光打印机等输出设备在输出图像时每英寸所产生的油墨点数如果使用与打印机输出分辨率成正比的图像分辨率，就能产生较好的输出效果。 ,屏幕分辨率:屏幕分辨率是指显示器上每单位长度显示的像素或点的数目，单位为”点/英寸”。如80点/英寸表示显示器上每英寸包含80个点。普通显示器的典型分辨率约为96点/英寸，苹果机显示器的典型分辨率约为72点/英寸。 1.1.2位图和矢量图 电脑中的图形图像分为位图和矢量图两种类型，理解它们的概念和区别将有助于更好地学习和使用PS图象处理软件CS4。例如，矢量图适合于插图，但聚焦和灯光的质量很难在一幅矢量图像中获得，而位图图像则能够将灯光、透明度和深度的质量等逼真地表现出来。 1。位图 位图也称为点阵图或像素图，由像素构成，如果将此类图像放大到一 定程度，就会发现它是由一个个像素组成的。位图图像质量由分辨率 决定，单位面积内的像素越多，分辨率越高，图像的效果就越好。 用于制作多媒体光盘的图像分辨率通常设置为72像素/英寸即可，而 用于彩色印刷品的图像则需要设置为300像素/英寸左右，这样印出 的图像才不会缺少平滑的颜色过渡。 2。矢量图 矢量图是由诸如Adobe Illustrator、Macromedia Freehand、 CorelDRAW等一系列的图形软件产生的， It consists of some curves which are described in mathematical way, and the basic elements are anchor point and path. No matter how many times zoom in or out, its edge is smooth, especially suitable for the enterprise logo, the logo for both commercial paper, or poster, only one will be able to meet the requirements of electronic documents, can zoom, and the effect is as clear. 1.1.3 image format There are many formats of image files, and the commonly used image file formats in Photoshop include PSD, JPEG, TIFF, GIF, BMP, etc.. Select the "file / open" or "file / storage" command, open the corresponding dialog box, in the "file type" drop-down list box, you can see the required file format, as shown in figure 1-3. Figure 1-3 all file formats Here are some of the commonly used image file format. ? (PSD *.PSD), PDD format: the two image file format is Photoshop dedicated graphics file format, it has other file formats can include a channel layer, some special information, and only can support all of the image color mode format, but the image file is stored in PSD, PDD format also than the image file is stored in another format the disk space more. BMP (*.BMP; *.RLE) format: BMP image file format is a standard dot matrix image file format that supports RGB, grayscale and bitmap color patterns, but does not support Alpha channels. GIF (*.EPS) format: GIF image file format is a file format provided by CompuServe. This format is compressed by LZW, and this image file will only occupy less disk space. The GIF format supports color patterns such as BMP, grayscale, and index colors, but does not support Alpha channels. EPS (*.EPS) format: EPS image file format is a PostScript format, often used in drawing and typesetting. This format supports all color patterns in Photoshop, which supports transparency in BMP mode, but does not support Alpha channels. JPEG (*.JPG; *.JPEG; *.JPE) format: JPEG image file format is mainly used for image preview and hypertext documents. The image saved by JPEG format can be compressed by high magnification, and the image file can be smaller, but it will lose some imperceptible data, so it is not suitable to use this format in printing. This format supports color patterns such as RGB and CMYK. PDF (*.PDF; *.PDP) format: PDF image file format is an electronic publishing software used by Adobe company for Windows, Mac OS, UNIX (R) and DOS systems, which supports JPEG and ZIP compression. PICT (*.PCT; *.PICT) format: PICT image file format is widely used in Macintosh graphics and page typesetting program. The PICT format is very effective for images with large areas of monochrome. This format supports RGB color patterns with a Alpha channel and color patterns such as Indexed Color without Alpha channels. PNG (*.PNG) format: PNG image file format is usually used to lossless compression and display images on World Wide Web. Unlike GIF, PNG supports 24 bit images, producing transparent backgrounds without jagged edges. This format supports RGB, Grayscale color modes with a Alpha channel, and RGB and Grayscale color patterns without Alpha channels. TIFF (*.TIF; *.TIFF) format: TIFF image file format can exchange data between many image software, its application is very extensive, most of the scanners output TIFF format image file. This format supports RGB, CMYK, Lab, Indexed, Color, BMP, Grayscale and other color patterns, and supports the use of Alpha channels in RGB, CMYK and other modes. 1.1.4 image color pattern The commonly used color model with RGB (red, green and blue said) mode, CMYK (cyan, magenta, yellow, said black) model, HSB (hue, saturation and brightness) model, Lab model, gray model, index model, bitmap mode, double tone mode and multi channel mode etc.. In addition to determine the image color mode can display the number of colors, but also affects the channel number and the size of the image file, each image has one or more channels, each channel stored in the image color information element. The default number of color channels in the image depends on the color mode, for example, CMYK image has at least 4 channels, representing the green, magenta, yellow and black information. 1.RGB mode The RGB model is made up of 3 colors, red, green and blue, which are blended in different proportions, also known as true color mode, which is the most common color pattern. The color and channel information displayed in the color and channel control panel is shown in figure 1-4. Figure 1-4 "color" and "channel" control panel corresponding to RGB mode 2.CMYK mode CMYK mode is a color pattern used in printing. It consists of 4 colors: Cyan (cyan), Magenta (Yang Hong), Yellow (yellow) and Black (black). To avoid confusion with the Blue (blue) in the RGB three primary colors, the black is represented by K. The color and channel information displayed in the color and channel control panel is shown in figure 1-5. Figure 1-5 "color" and "channel" control panel corresponding to CMYK mode 3.HSB mode The HSB model is based on the human eye's view of color, and all colors are described by hue, saturation, and brightness. Hue is the property of the main wavelength of a color. Different wavelengths of visible light have different colors. Different wavelengths of light can be mixed in different proportions to produce different colors. Saturation means the purity of color, that is to say, the proportion of grey components in the color phase, and the black, white and other grey colors have no saturation. At maximum saturation, hue has the most pure chromatic hue. Brightness refers to the brightness of color, ranging from 0% to 100%, black at 0%, white at 100%. 4.Lab mode Lab model is a color model issued by the international lighting Commission, which is converted from RGB three primary colors. The L component image brightness values range from 0 to 100; the a component represented by green to red spectral changes, the range of -120 to 120; the B component represented by blue to yellow spectral changes, the range and the a component of the same. The color and channel information displayed in the color and channel control panel is shown in figure 1-6. Figure 1-6 "color" and "channel" control panel corresponding to Lab mode 1.2 know the working interface of Photoshop CS4 As with other application software, to master and use Photoshop CS4 to complete the graphic design work, first of all, it should have an in-depth understanding of its work interface, distinguish the role of each functional part of the interface. After installing Photoshop CS4, double-click the PS icon on the desktop to start the software. When you start the software and open an image at any time, it will appear the working interface as shown in figure 1-7. Figure 1-7 Photoshop CS4 work interface Photoshop CS4 interface mainly by the title bar, menu bar, tool bar, property toolbox, control panel, image window and status bar and other parts are explained below in each part of the function interface and method of use thereof. 1.2.1 title bar The title bar is used to display the version number of the current Photoshop, and the right and the right buttons are used to minimize, restore, and close the work interface. 1.2.2 menu bar The menu bar is set at the command in various applications, from left to right, file editing, image, layer, selection, filter, analysis, 3D, view, window and help 11 menu items, these menu items in a collection of hundreds of menu commands, understand the characteristics of each menu command in, can easily master the menu command. The most common way to select menu commands is to click the menu item first with the mouse, and then select the menu command in the pop-up menu or submenu. In order to improve work efficiency, Most of the Photoshop command in CS4 can use shortcut keys to achieve fast selection, if the system menu command set the shortcut keys to open the menu to see the shortcut key commands, as shown in figure 1-8. For example, to select the "open" command under the "file" menu through the shortcut keys, just press the Ctrl+O key. 1.2.3 toolbox The toolbox uses the most frequently used tools in the process of image processing, which can be used to draw images, modify images, create constituencies, and adjust the image display ratio. Its default position is on the left side of the work interface. By dragging its top, it can be dragged to any position of the work interface. There is a folding button at the top of the toolbox. Click this button to arrange the tools in the toolbox in a compact arrangement, as shown in figure 1-9. To select the tools in the toolbox, just click the icon icon corresponding to the tool. Some tool buttons lower right corner of a small triangle marked with a black, said the tool in a tool group, of which there are some hidden tools in the tool button press the left mouse button or use right click, can display the hidden tools in the group, as shown in figure 1-10. 1.2.4 tools properties bar When you select a tool in the toolbox, the tool attribute bar at the bottom of the menu bar displays the attributes and parameters corresponding to the current tool, and the user can adjust the attributes of the tool by setting the corresponding parameters. When you select different tools in the toolbox, the parameter options in the tool property column changes with the current tool. For example, in the toolbox, choose "gradient tool" and "copy stamp tool", and the tool attribute bar effects are shown in Figure 1-11 and figure 1-12 respectively. Figure 1-11 the tool property column corresponding to the gradient tool Figure 1-12 tool attributes column corresponding to the copy stamp tool 1.2.5 control panel In Photoshop CS4, the control panel is the main functional panel for selecting colors, editing layers, creating new channels, editing paths and revoking editing, and is also a very important part of the work interface. The control panel defaults to the right side of the interface, which helps the user to set and modify the image. By default, the system will display 3 groups of control panels, each consisting of 2~3 panels, as shown in figure 1-13. Figure 1-13 the default control panel group opened by the system In Photoshop CS4, you can also open all kinds of control panels through the "window" menu, as shown in Figure 1-14, in addition to the default 3 groups of control panels displayed in the tool interface. The control panel of Photoshop CS4 can be folded to display as an integrated panel block. The folding button click Control Panel on the upper right corner of the panel can be folded into the panel, only the name of the thumbnail, as shown in Figure 1-15, the folding button into the expanding button, click the button to return to an expanded panel. When you need to display a single panel, just click the name of the panel to display this panel. Figure 1-14 "window" menu figure 1-15 folding display control panel The control panel group is not fixed, and can be arbitrarily split, its operation steps are as follows: Select "file / open" command in the open dialog box to find the "Chrysanthemum" image, click the button to open it, and then select "window / navigator" command, open the panel, use the mouse to drag out the control panel in the group label. Until the dragged control panel is transparent, as shown in Figure 1-16, release the mouse to complete the split of the control panel, as shown in figure 1-17. Figure 1-16 drag to split the panel diagram 1-17 split control panel Users can arbitrarily assemble the split control panel, and combine the most commonly used control panel into a group to facilitate the use. The method is: drag a control panel to the label of another control panel, and release the mouse when the dragged control panel is displayed in wireframe in another control panel. 1.2.6 image window The image window is the main place for browsing and editing operations on the image, the image window title bar mainly displays the current image file name and file format (as), shows the proportion (as) and the image color mode (such as information). 1.2.7 status bar The status bar at the bottom of the window, the leftmost display shows the ratio of the current image of the window, press the Enter button to display the proportion in which the input values can be changed after the middle of the image; displaying the current image file size; the right end of the slide bar display, as shown in figure 1-18. Figure 1-18 status bar Click anywhere in the image information display area of the status bar, and press the left mouse button, it will pop up the display of the current image collage size panel, as shown in figure 1-19. Press the Alt key on the keyboard, click and hold the left mouse button in the image information display area, will pop up the display of the current image width, height, channel and resolution and other aspects of the information panel, as shown in figure 1-20. Figure 1-19 collage size panel 1-20 panel showing more image information 1.3 Photoshop CS4 system optimization settings In the Photoshop CS4, you can optimize the settings of the system, such as the interface and auxiliary line color settings, you can also cursor, ruler and so on. These settings help users to operate software more conveniently and quickly. 1.3.1 routine settings Select "Edit / preferences / general command will open, as shown in Figure 1-21 the preferences dialog box, set the" conventional "option in the dialog box, can control the clipboard information, color slide bar display, color picker type etc.. Figure 1-21 "general" option 10 color device In the color picker drop-down list box, there are two options for Windows and Adobe. Compared with the Windows color picker, the Adobe pickup is relatively complex. In Adobe color picker, you can pick colors according to 4 different color patterns. When setting, select the Adobe option in general. Select the Adobe color picker, click the toolbox in the foreground or background color will open, as shown in Figure 1-22 the color picker dialog box, click the button in the dialog box, the system will open the "color database" dialog box, as shown in figure 1-23. Figure 1-22 "color picker" dialog box 1-23 color Library dialog box Select the Windows color picker, click the toolbox in the foreground or background color will open, as shown in Figure 1-24 the color dialog box in the dialog box, click the button, the system will open the dialog box shown in figure 1-25. Figure 1-24 color dialog box 1-25 color dialog box 2. image interpolation When the image size or image transform command is used to change the image, Photoshop CS4 will generate or delete pixels according to the set interpolation method. In the image interpolation drop-down list box, there are 5 interpolation options, as shown in figure 1-26. Among them, the "adjacent (retaining the hard edge)" option will make the modified constituency appear jagged edge, so its quality is quite low. "Two linear" options, both from quality and speed, are better than "contiguous" (hard edge) options, but it's not the perfect pixel allocation. And "two cubic (for smooth smooth gradient)" option, whether from aesthetic appreciation or accuracy, is perfect, although its operation speed is slow, but the hue change is the most uniform. Therefore, in setting interpolation method, the general choice of "two cubic (suitable for smooth gradient)" option. 3. options and historical records In the "options" column, there are 11 check boxes, set the appropriate options, can make the operation more convenient. You can store and edit record items in the "history" column. 1.3.2 interface settings Select the "Edit / preferences / interface" command to enter the "interface" option in the preferences dialog box, as shown in figure 1-27. In which you can set the color and border color of the screen, you can also choose a panel and document folding and floating way, etc.. Figure 1-27 "interface" option 1.3.3 file processing settings Select "Edit / preferences / file processing system will open" command, as shown in Figure 1-28 the preferences dialog, the dialog box in the "image preview" and "file extension" drop-down list box and file compatibility "column, and prompt column version. Figure 1-28 "file processing" option There are 3 options in the image preview drop-down list, which are "total no storage", "always store" and "store query"". There are two options in the file extension drop-down list, namely, "use uppercase" and "use lowercase."". You can freely set the size of an extension. Generally speaking, lowercase extensions are easy to read. In the file compatibility column, there are 3 checkboxes and a drop-down list box. Among them, "check box to decide whether to allow the TIFF image format stored in the ZIP and JPEG compressed files before storage of layered TIFF files, the maximum compatibility lists for PSD and PSB versions to flatten the image file drop-down box can be stored for each file. 1.3.4 performance settings In the preferences dialog box, select performance options, and enter the dialog box shown in figure 1-29. The "memory usage" column on the left plays a very important role in optimizing the performance of Photoshop. The temporary disk is defined as some temporary space defined on the hard disk. If the Photoshop CS4 is running beyond the specified memory available by the computer, the system will put the file on the temporary disk. In the "temporary save" column, you can set 4 temporary disks freely. There are two drop-down list boxes on the right side of the dialog box: "history status" and "cache level". In the history status drop-down list box, you can set the maximum number of historical records that can be kept in the history panel. Caching enables Photoshop to speed up image reproduction during editing. The image cache maintains several copies of the file, so that the screen can be updated quickly during color adjustment and layer transformation operations. Cache settings range between 1~8, 2 or 3 cache settings are best for files below 10MB, and 4 for files around 10MB. 1.3.5 cursor settings In the preferences dialog box, select the cursor option to set the color and cursor display. The options are the same on the PC and on the Macintosh, as shown in figure 1-30. In this dialog box, there are 3 columns: "drawing cursor", "other cursor" and "brush preview". In the "painting cursor" column, you can set the display of the brush cursor, there are 4 radio buttons in this column. Among them, the standard radio button is selected to display the brush cursor as an icon, and the "precise" radio button is selected to display the brush cursor in a precise cross shape. In other cursor bars, you can set the cursor for other tools, and you can set the brush color in the brush preview column. 1.3.6 transparency and gamut settings In the preferences dialog box, choose transparency and color gamut options, and open the dialog box shown in figure 1-31. "Transparent regional settings" and "color warning" two bar in the dialog box, setting can be a transparent background in the "transparent locale" column, in the "color warning" column can be set to color warning colors. Figure 1-30 "cursor" option 1-31 "transparency and gamut" option Refers to a color can be displayed or printed color gamut range, the purpose is to indicate which color warning can be printed, which is not printed. 1.3. 7 units and ruler settings The unit can change the scale of measurement setting unit and scale option and specify the column width and clearance, select units and rulers "option system will open the dialog box shown in figure 1-32. The unit of measure scale there are pixels, inches, centimeters, millimeters, and 7 percentage points, pica. Press the Ctrl+R key to control the display and hide of the ruler. The column size of the ruler can be adjusted in the column size column. There are two radio buttons in the "point / pica size" column, usually select the "PostScript (72 DPI) radio button. In order to switch conveniently, you can switch the scale units directly in the "information" panel, as shown in figure 1-33. Figure 1-32 "unit and ruler" option figure 1-33 "information" panel 1.3.8 reference line, mesh, and slice settings Setting the "reference line, grid and slice" option helps users locate the units in the image. In the preferences dialog box, select the reference line, grid, and slice options, and open the dialog box shown in figure 1-34. Figure 1-34 "reference line, mesh and slice" option The reference line column is used to set the auxiliary line that is pulled out by the ruler. The color and style of the auxiliary line can be set here. In the grid column, you can set the grid into a variety of colors, and can be set to a straight line, dotted line or dot line and other styles. Set the grid line spacing and the sub grid two options to change the density of grid lines in the grid. 1.3.9 add tools settings As shown in Figure 1-34, click the button to open the "enhancement tool" preset dialog box as shown in figure 1-35. In this dialog box, there are two columns of "additional tool folder" and "extension panel". Figure 1-35 "add tools" option Synergy tool (plug-in) is developed by Adobe and third party dealers, filters in the Photoshop environment, installed in the Plug-Ins folder of Photoshop in default mode. If the installation position to change the filter, the filter is installed on the hard drive, and in the "goodies" preset dialog box select "additional enhancement tools folder check box, and then open the" browse for folder dialog box select installation directory, click the button. 1.4 image editing tools In the process of image processing, the image can be processed more accurately by using auxiliary tools. The auxiliary tools mainly include ruler, reference line and grid, which are introduced below. 1.4.1 scale Select the view / ruler command, or press the Ctrl+R key to display the horizontal and vertical rulers at the top and left of the image window, as shown in figure 1-36. Click the right mouse button on the ruler and change the ruler's unit in the pop-up shortcut menu, as shown in Figure 1-37. The system defaults to centimeters. Again, press the Ctrl+R key to hide the ruler. Figure 1-36 shows the ruler figure 1-37, setting the scale unit 1.4.2 ruler tool The ruler tool can easily measure the distance between any two points in the work area. Open an image, click the toolbox of the ruler tool, only need to press the left mouse button and drag the line in the starting position to the end of the line, will draw a line (this line will not print out), as shown in figure 1-38. Figure 1-38 measuring distance At this point, the measurement results between the two points will appear on the toolbar and the information panel, and the property bar is shown in figure 1-39. In the ruler tool attribute bar, X and Y represent the horizontal and vertical values of the starting point of the measurement respectively. W and H represent the horizontal and vertical distances between the two endpoints, respectively. A and L1 denote the angle between the line segment and the horizontal direction and the length of the line segment respectively. Figure 1-39 ruler tool property bar parameter 1.4.3 reference line The reference line is a straight line floating on the image, which is divided into horizontal reference line and vertical reference line. They are only used to provide the designer with position reference and will not be printed out. In order to use the reference line to assist the drawing, the reference line should be created first, and the operation steps are as follows: Select the view / new reference line command, and open the new reference line dialog box, as shown in figure 1-40. In the open dialog box, set the type and location of the reference line, and then click the button to create the reference line. In order to make the reader understand the importance of the ruler deeply, this paper introduces the material added to the graph as an example, and the steps are as follows: Open the "boat" image, press the Ctrl+R key to display the ruler in the image window, as shown in figure 1-41. Drag down the mouse from the horizontal ruler to the appropriate position in the image to create a horizontal reference line, such as As shown in figure 1-42. Figure 1-41 open the image and show the ruler figure 1-42 create a horizontal reference line Open the "bird single" image, drag the image directly to the boat image using the moving tool, and move the bottom of the bird single image to the reference line, as shown in figure 1-43. In the same way, open the bird twin image and drag it into the boat image window, then align its bottom with the reference line, as shown in figure 1-44. Figure 1-43 adjusts the first object graph 1-44 and adjusts second objects 1.4.4 mesh The main purpose of the grid is to look at the perspective relationship of the image and assist other operations to correct the wrong perspective relationship. Here is an example of correcting the wrong image perspective to introduce the display and function of the grid. The steps are as follows: Open the "house" image, select the "view / display / grid" command, and display the grid in the image window, as shown in figure 1-45. By observing the left side of the magnified image, it can be found that the grid in the vertical direction between the window and the wall does not form a parallel relationship, as shown in Figure 1-46, which indicates that there is an error in the perspective of the picture. Fig. 1-45 shows the mesh diagram 1-46 magnifying the relationship between the observation image and the mesh Selection of cutting tools, draw a cutting frame on the screen, and then select the attributes column of the "perspective" check box, use the mouse to adjust the cutting edge of the image frame, error correction step 2 observed, is shown in figure 1-47 the right perspective. The Ctrl+ key is used to hide the grid, and the corrected image is shown in figure 1-48. Fig. 1-47 correction of perspective relation 1-48 according to reference line effect of correct perspective 1.5 basic example -- defining the individual workspace The basic example of this chapter, by adjusting the display mode of the toolbox in the Photoshop CS4 interface, and the combination of the control panel, will be set into their familiar Photoshop interface. 1. operation thinking The operation of this example is as follows. 2. operation steps The following details the production of this method, the steps are as follows: Start Photoshop CS4, and select "window / workspace / basic" command. The interface will be replaced with the style shown in figure 1-49. Click the folding button at the top of the toolbox and arrange the tools and control panel in the toolbox, as shown in figure 1-50. Figure 1-49 changing the work interface diagram 1-50 shows the "history" control panel group Use the mouse to hold down the gray rectangle bar on the right side of the "adjust" control panel group and drag it out, as shown in figure 1-51. Then close the panel group. Drag the "histogram" control panel "color" control group to a group of grey rectangular panel, release the mouse when there is a blue line, with "histogram" and "historical records" control panel control panel, get the work area, as shown in figure 1-52. Figure 1-51 separating control panel panel 1-52 merging control panel 1.6 basic exercises In the process of image processing, it is necessary to convert the current color mode to another color mode according to the actual situation, and then the relevant operation of the color mode conversion is mastered through practice. This exercise converts the color pattern to the image shown in Figure 1-53, and gets the grayscale pattern effect shown in figure 1-54. Through practice, the reader can further understand the knowledge in this chapter. Fig. 1-53 RGB mode image file 1-54 image after adjustment The train of thought and hints of this exercise are as follows. Change gray mode image of color mode prompt dialog box Q: in addition to drawing bitmaps, can Photoshop CS4 draw vector maps? Answer: Yes, Photoshop CS4 can also draw vector graphics in addition to drawing bitmaps. Using pen tool set and shape tool group, the vector graphics can be drawn directly. Q: which color patterns are used more frequently in the actual work when rendering images in Photoshop? Answer: if it is their own amateur drawing, do not need to print, print, using RGB mode can. If the design draft for printing, you need to set the CMYK mode to design the image, if the other color mode of the image, before the output printing, it should be converted to CMYK mode. Q: why use the mouse to drag the reference line on the edges and left edges of the image? Answer: if you want to manually pull out the reference line, you should first show the scale. Select the "view / ruler" command, or press the Ctrl+R key to display the ruler, and then use the mouse to drag the edge and left edge of the image, you can get the reference line. Q: if you want to install Photoshop CS4, what are the requirements for the computer? Answer: Photoshop CS4 recommends configuring CPU over 1.8GHz, memory 1GB. In other respects, Photoshop CS4 does not support the installation of flash based devices. The installation of available hard disk space to 1GB, in the actual installation process for decompression and other factors, may also need additional disk space, so the C best kept at about 20GB. Photoshop is a graphics and image editing software launched by Adobe company. It is the best recognized graphics and image processing software on PC. The Photoshop version went from 1 in the early 1990 to 7 in 2002. In the subsequent development process, the official version number of Photoshop 8 is CS, 9 version number becomes CS2, 10 version number becomes CS3, and 11 version number becomes CS4. CS Adobe Creative Suite is behind a set of software in the abbreviation of two words, on behalf of the "creative collection" is a unified design environment, Adobe Photoshop, Illustrator, InDesign, GoLive and Acrobat Professional software and Version Cue, Adobe Bridge and Adobe Stock combined with Photos. Photoshop software has been widely used in graphic design because of its perfect drawing tools and powerful image editing function. The new Photoshop CS4 version, with vector image editing functions, and comprehensive application of image editing and auxiliary line, multi layer grid scale, and other auxiliary tools, design of advertising, VI, illustration, packaging, product modeling and photo processing.