Autotek autocad raster design 2010 用户手册

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Changing Image Density
For editable image types, you can change the pixel density value, density
units, or both.
Common reasons for changing density are as follows:
Decrease the image density to reduce the file size of the image or of the
drawing.
Increase the image density to make more pixels available in your image.
For instance, circles and other curves look smoother at higher densities.
You can adjust the density of multiple images simultaneously if all selected
images have the same density and units.
 (page 303) displays the current pixel density
(using the current image units) and prompts you to enter a new density. After
you enter the new density value, you see what the image dimensions will be
if you apply the change.
 (page 382)
382), 
 (page 391), 
 (page 392), or 
 (page 393).
NOTE Changing the density of an 8-bit image using bilinear or bicubic resampling
may replace some existing colors in your palette. If you would like the image to
retain all of its colors you should increase the pixel depth before using bilinear or
bicubic resampling. For more information, see 
 (page 116).
Adjusting the density of an image can change the image file size, but it does
not change the image correlation, scale, or (in most cases) the image size in
AutoCAD units.
To change the density of a selected image
Click Image menu  ➤  Image Processing  ➤  Change Density.
Select the image or images you want to change, and then press Enter.
NOTE You can also select your image or images before you select the Change
Density command.
In the 
 (page 303) dialog box, enter a new density value
or pixel size. Optionally note the resulting change to image dimensions.
Convolving an Image | 115