Autotek autocad raster design 2010 用户手册

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For example, if your source image has a value of 200 dpi, and your destination
image has the value of 400 dpi, the destination image will retain the value of
400 dpi after you have performed a merge.
The destination image is expanded to encompass your source image(s). The
background will be filled with the transparency color. You can change the
transparency color in your image. For more information, see 
 (page 62).
To merge images together
Click Image menu  ➤  Merge  ➤  Images.
Select your source images.
Select your destination image.
You are prompted whether to remove the source images after the merge.
Click Yes to start the merge process.
Quick Reference
Menu
Image  ➤  Merge  ➤  Images
Raster Design Toolbar
Command Line
iimerge
Merging Vectors into a Raster Image
Merging vectors creates a raster equivalent of a vector entity.
 (page 391) drawing you can merge vectors into
an existing image or a new raster image. Vector merge allows you to make
precise changes to your raster image with AutoCAD, while keeping your data
in a raster format.
NOTE Vector merge can only operate on a single image at a time.
Merging Vectors into a Raster Image | 161