With GIMP it is possible to change the HUE and TRANSPARENCY of an image. To change the HUE of an image navigate to the COLOR drop down menu and select the HUE/SATURATION tool. Notice that you can select from a number of presets for adjustment or create a new preset that you can change.
You can either adjust the hue for the master or for the additive and subtractive primary colors. You can also use the sliders to adjust hue, Lightness and saturation. To adjust the transparency of an image, navigate to the LAYER tab and select transparency.
Here you can add an alpha channel and select the threshold for that channel. You can also add a new transparent image using the NEW function from the drop down FILE men.
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