The vector … scope is a powerful tool to analyze the colors present in an image. **Is your feature request related to a problem? Please describe.** It seems awkward and fidgity to try to undo the display profile to get at the actual color, and it seems to me the only way to avoid these troubles is to have the global color picker jack into the pipeline earlier, when the data is still in the working space and untruncated. With the physically measured display profile, there is deviation on all of the reported values, even though they are all well within gamut (gamut check on the display profile shows nothing out of gamut). the builtins like sRGB, AdobeRGB, ProPhoto, etc.). Specifically, if I pick colors from a numerically-generated grayscale gradient, the picker shows the correct R=G=B values only if I override the display profile with an ideal profile (e.g. However, I am finding (using DT4) that colors are distorted regardless of relationship to display gamut. If you are using a display color space which is not “well behaved” (this is common for a device profile), then colors that are outside of the gamut of the display profile will clip or distort. >As the global c … olor picker runs at the end of the preview pixelpipe, it receives data in display color space then converts it to histogram color space. In #3271 and darktable-org/dtdocs#188, it was clarified that See here my screenshot taken in Darktable v4.4.2: Why is the Itten color wheel not displayed with pairwise opposing colors in Darktable RYB vectorscope?įor some colors the opposite placement is nearly correct, but for others not.With this in mind I will now reach my main question: I do not really care about the difference, because the basic principle of RYB color harmony is important. On the Wikipedia page the SVG image is with yellow sRGB =(224,228,54) = #f4e436 and on other websites you find the values sRGB = (244,229,0) = #f4e500. I will mention here only the yellow color as an example. Quite good is not only the collection from David Briggs on but even more the content of his whole website. And maybe there was later never an agreement about the colors of his wheel? In Wikpedia and on various websites, there are used a lot of different sRGB colors. Itten did not know, because sRGB was known and standardized much later. What are the sRGB colors of the color wheel of Johannes Itten?.Especialls the blue is much darker and the opposing colors really look pleasing and in harmony. If you have a look on good RYB color wheels like the one from Johannes Itten at en./wiki/Johannes_Itten you see that the colors are different. Therefor, to my humble opinion the RYB color wheel based on sRGB primaries is nonsense. Calculation can be done with this, but the integration based on the properties of the human eye is quite complicated, There is no simple formula, even when the paint is defined. The reason of confusion is, that RYB cannot be converted to RGB, because RYB is paint and subtractive addition of paints does require detailed knowledge about the spectral properties of the paint. And the RYB colors are totally different from RGB/CMY colors if you like to see them in sRGB color space. For example complementary colors with RGB/CMY like Red-Cyan or Blue-Yellow have nothing to do with color harmony, because with RYB, the harmonies are e.g. I learned RYB also in school.Ī couple of websites or tools about RGB, CMY and RYB are terribly wrong or do not inform about the assumptions of conversions. Apparently the ideas of color harmony are quite old and came from painting, when CMY paint was not available and RYB paint was available. Inspired by the good very videos of Boris s7habo on youtube at /user/s7habo I had a look on the history of color harmony.
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