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CAD tip CAD tip # 7654:

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Three methods for transparent images in AutoCAD.

A - answer Sample GIF In AutoCAD 2011, you can use three different methods for setting full or partial transparency of certain areas in a raster image (also color image) inserted in a DWG drawing.

Transparency - 3 types

  1. The first way is using the image property "transparency" available in the raster formats GIF and PNG. This transparency is then used by the option "Background transparency", available in the AutoCAD context ribbon and in the Properties palette (Ctrl+1) and via the command TRANSPARENCY. If you enable this entity property, the respective area of the raster image will become fully transparent. The same property is available also for monochrome (black-and-white) raster bitmaps - e.g. scanned maps.
  2. The second method is the object property Transparency (new in version 2011). This property can be set for any type of drawing object, including raster images - you can use it to smoothly control the transparency level. Again, either through the ribbon or over the Ctrl+1. The sample image uses the transparency level of 20%. See also CHPROP.
  3. The third way is based on the clipping boundary inside the raster image (IMAGECLIP). This clip can have an arbitrary shape. The "Invert clip" option will clip the inside of the image, not the outer surrounds of the border - see the sample.
In the "mapping" versions of AutoCAD and Raster Design, you can also make transparent a specific color (hue) of a color bitmap image.
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22.11.2010    30571x  
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See also:
Tip 9976:How to make AutoCAD render without background (transparent)?
Tip 9549:Rendering of 3D models without background in Autodesk Showcase.
Tip 7761:Borders and X on decals in Revit.
Tip 6422:Which raster format to choose for transferring images?
Tip 4158:Transparent raster images in AutoCAD.

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