I have a set of images. With each image, I want to pick the base color for that image.
For that image, I want to creage a rectangle that will serve as background for text.
I want the color of that background to match the base color for the image --- but do so with a 75% transparency applied. All of these text background rectangles to match the base color, with the transparency applied.
What formula or process can I use to calculate a starting RGB (w/o transparency applied) that -- once transparency has been applied -- will yield the base color RGB?
I really hope I made myself clear. Thanks in advance for any assistance.