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CAD tip CAD tip # 7654:

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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.
ACAD2011MapCivilCO
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22.11.2010    87668×  
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See also:
Tip 13597:How to convert RGB color to Pantone, RAL, AutoCAD ACI, CMYK or vice versa?
Tip 13557:How to create an image with transparent background in Fusion 360?
Tip 12847:How to make transparent mask for raster maps in Autodesk Infraworks?
Tip 12361:Seamlessly connected images by irregular clipping in AutoCAD (or LT).
Tip 12214:How to set bitmap transparency in an Inventor drawing.
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