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That worked!! I knew it felt like I was missing something minor. It was the colormap -- I had no idea about the Rearrange Colormap feature. My hot dog meal works perfectly now! Thank you so much, binary!binary @ Jun 20 2017, 10:02 AM wrote: I haven't tried the lastest version of GIMP2, but here's what worked for me with the not-latest version.
Load image into GIMP2 then click Image - Mode - Indexed. For Colourmap, select "Generate optimum palette", set "Maximum number of colours" to 16, and then click Convert. (Note: if your image uses less than 3 colours, GIMP may save it as a 2-bit colour image, which will not be suitable for use in a download file.)
To specify the transparent colour, click Colours - Map - Rearrange Colourmap. A row of boxes containing each colour used in your image will appear. Drag the box containing your background colour into the left-most position, and then click OK.
To save your changes, click File - Save As. Set the Name as you wish. Hit Enter or click Save. When the "Save as BMP" dialog appears, make sure the "Run-Length Encoded" box is empty, and then click Save.