Unlike the HSV Color and Value blend modes (which mangle the image's color and tonality), LCH blend modes allow you to separate corrections to LCH Color from corrections to LCH Lightness.
#Fish krita tutorial how to
Section C shows how to use the LCH blend modes to colorize a black and white rendering of the repaired image. Section B below shows how to use the LCH blend modes to repair blown-out highlights in camera-saved jpeg. LCH Color is a combination of LCH Chroma and Hue, and corresponds to HSV Color, which is a combination of HSV Hue and Saturation (again, the names are the same, but the two blend modes are based on very different mathematics).LCH Hue corresponds to HSV Hue (the names are the same, but the two blend modes are based on very different mathematics).LCH Chroma corresponds to HSV Saturation.LCH Lightness corresponds to HSV Value.LCH is mathematically derived from the CIELAB reference color space, which in turn is a perceptually uniform transform of the CIEXYZ reference color space. "LCH" stands for "Lightness, Chroma, Hue". All the steps in the tutorial were subsequently tested in default GIMP, but I don't actually use default GIMP for image editing. Processing notes: The images on this page were processed at 32-bit floating point precision using my patched version of high bit depth GIMP 2.9 and working in a linear gamma version of the sRGB color space ("sRGB-elle-V4-g10.icc" from my profile pack). In my patched GIMP, if the image isn't in a linear gamma RGB working space, the LCH blend modes, the conversion to black and white using Luminance, and various other editing operations will be affected by "gamma errors" and so will produce wrong results. To follow this tutorial using my patched GIMP, first convert your image layer stack to one of the linear gamma RGB ICC working space profiles included in my well-behaved ICC profile pack (the linear gamma profiles all have file names ending in "-g10.icc"). My patched GIMP allows you to edit in any well-behaved RGB working space. If you use default GIMP, make sure to change the Precision to "Linear light", or else your layers won't blend properly.
When using default GIMP, if you try to edit images in color spaces other than the GIMP built-in sRGB color space, many editing operations will produce wrong results, including the LCH blend modes and converting to black and white using Luminance.
This tutorial assumes you are using default GIMP 2.10, which is an "sRGB only" image editor. The LCH blend modes never made it into GIMP 2.8, but are available in high bit depth GIMP 2.9/2.10.
#Fish krita tutorial code
GIMP attracts some pretty talented programmers, and the original bug report morphed into code that provides GIMP with the ability to blend colors using "LCH" blend modes in place of the HSV blend modes. Introduction: GIMP's new LCH color blend modes From bug reports, good things happenīack in 2006 a bug report was filed that asked for GIMP's color blend modes to emulate PhotoShop's color blend modes.
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