Makes a certain color in an image transparent
Sometimes you want a certain color in an image to be transparent, that is, invisible. For example game developers need translucent regions in their images so that the things below are not hidden by an ugly rectangle.
transconv (transparency converter) makes the color, which appears in the upper left corner of the image, translucent and converts the image into the png format which supports transparency. This means, transconv saves time and doesn't forget to replace single pixels, which a human could easily miss, when doing the same task with an image editing tool.