I can't speak for Clyde and GSAK, but GPSBabel doesn't want to be in the image manipulation business. Give us a file that works on the device and we'll pass it through. Trying to guess all the ways an image can be broken and all the undocumented nuances of Garmin's hardware isn't a game I want to play. Nor will we resize them, convert your PNG to a BMP, etc.
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