"Adobe international certification" Photoshop software, about drawing tutorial?

Understand shapes and paths

Adobe Photoshop Drawing in includes creating vector shapes and paths . stay Photoshop in , You can use any shape tool 、 Pen tool or free pen tool . You can use the options of each tool in the options bar .

stay Photoshop Before starting drawing in , You must select a drawing mode from the options bar . The selected drawing mode will determine whether to create vector shapes on its own layer 、 Or create a working path on an existing layer or create a rasterized shape on an existing layer .

Vector shape Are lines and curves drawn with shapes or pen tools .（ See drawing shapes and drawing with the pen tool .） The vector shape is independent of resolution , therefore , They are resizing 、 print to PostScript The printer 、 Stored as PDF File or when importing into a vector based graphics application , Will keep clear edges . You can create a custom shape library and edit the outline of a shape （ Called the path ） And attribute （ Such as stroke 、 Fill color and style ）.

route It is an outline that can be converted to a selection or filled and traced with color . By editing the anchor of the path , You can easily change the shape of the path .

Work path It's in “ route ” Temporary path in panel , Used to define the outline of a shape .

You can use paths in several ways ：

• You can use the path as a vector mask to hide layer areas .
• Convert path to constituency .
• Use color fill or stroke path .

When exporting an image to a page layout or vector editor , Specify the stored path as the clip path to make part of the image transparent .（ See Creating transparency using image clipping paths at the end of the article .）

The drawing mode

When using shape or pen tools , You can use three different modes to draw . When selecting a shape or pen tool , You can select a mode by selecting the icon in the options bar .

Shape layer Create shapes in separate layers . You can use the shape tool or the pen tool to create shape layers . Because it can be moved easily 、 alignment 、 Distribute and resize shape layers , So the shape layer is very suitable for Web Page create graphic . You can choose to draw multiple shapes on one layer . The shape layer contains a fill layer that defines the shape color and a link vector mask that defines the shape outline . A shape outline is a path , It appears in “ route ” The palette .

route Draw a working path in the current layer , You can then use it to create a selection 、 Create a vector mask , Or use color fill and stroke to create grid shapes （ It is very similar to using painting tools ）. Unless the working path is stored , Otherwise it is a temporary path . The path appears in “ route ” The palette .

Fill pixels Draw directly on the layer , It is very similar to the function of painting tools . When working in this mode , What you create is a grid image , Not vector graphics . You can process the drawn shapes as you would any grid image . Only shape tools can be used in this mode .

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Create transparency using the image clip path

You can use the image clipping path to define the transparency of the image placed in the page layout application . Besides ,Mac OS Users can also embed... In some word processor files Photoshop Images .

In print Photoshop Image or when the image is placed in another application , You may only want to use a portion of the image . for example , You may only want to use foreground objects , And exclude background objects . Image clip path Enables you to detach foreground objects , And make other objects transparent when printing images or putting images into other applications .

Be careful : Paths are vector based , So they all have hard edges . When creating an image clip path , Cannot preserve feathered edges （ As in the shadow ） Softening degree of .

1. Draw a working path , To define the image area to display .

Be careful : If you have selected an image area to display , You can convert the selected area into a working path . About instructions , See convert selection to path .

2. stay “ route ” The palette , Store the working path as a path .

3. from “ route ” Select... From the panel menu “ Clip path ”, Set the following options , And then click “ determine ”：

• about “ route ”, Select the path to store .
• about “ Flatness ”, Leave the flatten value blank , To print the image using the printer's default values . If you encounter a print error , Please enter a flattening value to determine PostScript Explain how the program simulates curves . The lower the smoothness value , The more lines are used to draw the curve , The more accurate the curve is . The range of values can be from 0.2 To 100. Usually , For high resolution printing （1200 dpi To 2400 dpi）, It is recommended to use from 8 To 10 Flattening setting of ; For low resolution printing （300 dpi To 600 dpi）, It is recommended to use 1 To 3 Flattening setting of .

4. If you intend to print the document in print color , Please convert the file to CMYK Pattern .

5. Store the file by doing one of the following ：

• If you want to use PostScript The printer prints the document , Please use Photoshop EPS、DCS or PDF Format for storage .
• Use non PostScript The printer prints the document , Please use TIFF Format store and export it to Adobe InDesign perhaps Adobe PageMaker 5.0 Or later .