Adding color to digital images

A computing device to implement an image colorization system for adding color to digital images in a digital medium environment, the computing device comprising:

• a memory to maintain a digital image to be color adjusted;
• and
• a processor system to implement an image colorization application at least partially in hardware of the computing device to:
• convert pixel content of the digital image to a LAB color space, the digital image displayed in an image editing interface of the image colorization system;
• determine a lightness value (L) in the LAB color space of the pixel content of the digital image at a specified point on the digital image;
• determine colors representable in an RGB color space based on combinations of A,B value pairs with the lightness value (L) in the LAB color space;
• determine a range of the colors for display in a color gamut in the image editing interface, the range of the colors corresponding to the A,B value pairs with the lightness value (L) of the pixel content at the specified point on the digital image, the color gamut including an indicated color of the range of the colors;
• and
• determine additional colors for display in a color saturation chart in the image editing interface, the additional colors having different saturations of the indicated color.

In a digital medium environment for adding color to digital images, a method implemented by a computing device, the method comprising:

• a step for determining colors representable in an RGB color space based on combinations of A,B value pairs with a lightness value (L) in a LAB color space, the lightness value (L) corresponding to pixel content at a specified point of a digital image to be color adjusted;
• clustering the colors into color clusters;
• and
• a step for determining a color palette for display in an image editing interface, the color palette including a respective color that is closest to a respective color center for each respective color cluster.