Article # 608, added by Geoworks, historical record
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How to have transparent backgrounds on bitmaps.
Q. Is it possible in GEOS, especially on the Nokia 9000, to have icons with transparent backgrounds? A. If you've got a PCX file that you want to convert to an icon, the 'm' switch in cvtpcx allows you to say that one of the colors is masked out. You need to know the decimal number corresponding to the color - a program like Paint Shop Pro or Neopaint should tell you this info. From the documentation on cvtpcx: -mPixel to be masked out. Any pixel containing this color (a decimal number) will be given a 0 bit in the mask for the color bitmap. Defaults to none. Light cyan is used for the transparent mask on the N9000. Specify that light cyan is the mask in the cvtpcx script with "-m11".