ImageMagick Colorize GIF and Preserve Transparency

Question

I have a small icon GIF that I would like to change the color. All opaque GIF pixels should be replaced by this new color, but preserve transparency for the gif. Then I need to place that new colored GIF over a background map, all in one command line. Here is what I have, but it's not changing all gif opaque pixels. Attached is the GIF icon. (Edit: I know im only targeting the white here, but just can't figure out how to target ALL opaque pixels in the GIF)

exec("{$convert} {$map_image} \( {$map_icon} -fill orange -opaque white -geometry +1700+600 \) -composite map2.jpg ");

Answer 1

Use +opaque none to fill all non-transparent colors in ImageMagick. The +opaque means everything "but" that color.

convert grid.gif -fill orange +opaque none x.png