Migration Guide : A. Features Introduced in OpenROAD 4.1 : OpenROAD 4.1 New Features : Icon Images
 
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Icon Images
OpenROAD 4.0 support for icons is extremely limited. An icon file can contain multiple images. The OpenROAD 4.0 implementation uses only the first icon image in the icon file. It treats icons with transparent colors like a monochrome bitmap.
An icon may have a transparent area that is represented by the "transparent color." When an icon is placed on a form, OpenROAD 4.1 will honor the transparent color and allow colors below the transparent area of the icon to show through.