How would one pick or select all of a single color within Photoshop, Paint.NET, or The Gimp?
The objective is to edit everything with that color afterwards, such as by brushing over it with another color. So if I were to select a certain red hue of an apple, then brushed it over with pink, only all of the parts of the apple with that red color would then be pink. I could use the magic wand tool, but don't know if there's something that can scan the image for every pixel with that color.