How do I make a specific color transparent? How do I make a specific color transparent? Guest (visitor) (OP) 16 Aug 02 11:09 I've searched and Red the FM but I can't figure out how to use GIMP to make a color transparent in a PNG. Suppose I want all white in an image to be 100% transparent. How do I do it? What menu do I go to? RE: How do I make a specific color transparent? chanio (Programmer) 15 Sep 02 10:35 First select the layer to apply the transparency.Over that layer selection (not over the image), right-click menu & select "add alfa channel". Now you can apply transparencies.Over the image, right-click menu & select: "Select/select by color". Now just click over the color of the selected image, and the right-click & select "Edit/Cut".Voilà! :))Help yourself!