![]() Unfortunately you can't edit color separately from tonality while working directly with RGB colors because color and tonality are spread out over all three RGB channels. The familiar RGB color spaces (sRGB, AdobeRGB1998, ProPhotoRGB, Rec.2020, etc) are all defined relative to the XYZ reference color space. All the colors that the average human being can see can be precisely located inside the XYZ color space. ![]() The XYZ color space is based on experiments that map out the way humans perceive color. I'm sure you've heard of RGB, XYZ, LAB, and maybe even LCh, which are the color spaces we'll be taking advantage of in this tutorial: Three parameters to describe colorĪny way you slice it, it takes three parameters to describe color, except for when it takes five or six parameters - brightness, lightness, colorfulness, chroma, saturation, and hue - in which case the topic is color appearance models. There should be thunderous applause from the audience for the GIMP developers and contributors who made this possible - separate processing for color and tonality is one of the holy grails of image editing. GIMP's new LCh blend modes allow you to put your edits for color and tonality in completely separate layer groups, without having to "Make New from Visible" every time you make a change in whichever group underlies the other.
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