adobe photoshop - How can I select a single color within an image?

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.

Answer

This is a vague question so I'm just going to answer it with what I've used before.

You would use the eyedropper tool shortcut I.

You would use the color picker tool shortcut O.

In Paint:

Also called the Color Picker Tool

Imagemagick command line:

convert -unique-colors -depth 8 txt:- > output.txt

ImagickPixel Imagick::getImagePixelColor ( int $x , int $y )

jQuery/JavaScript:

• Color Thief: The documentation for it is bad but there project is solid.


• palette: Very simple tool.

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