Adds HSI and HSY' to the advanced colour selector.
So, I want to add Intensity and Luma(The latter would be like mypaint) to the advanced colour selector options in Krita. But for that I first need conversion functions. HSI, intensity, uses a system where a color is mapped to a tone scale depending on the sum of it's components. So basically, Intensity= (r+b+g)/3. HSY, Luma, is similar, but it weights the components instead. So Luminosity=(r*R'+g*G'+b*B'). Both are a little more intuitive to use for artists. Krita's Advanced c-pick currently uses QColor hsv and hsl functions through the display converter. This patch tries to add eight functions to KoColorConversions: *HSIToRGB, RGBToHSI, HCIToRGB, RGBToHCI. These functions are for converting from and to HSI, these functions use qreals in the range of 0.0-1.0. *HSYToRGB, RGBToHSY, HCYToRGB, RGBToHCY. These functions are for converting from and to HSY, these functions also use qreals in the range of 0.0-1.0. On top of that, they have extra parameters for setting the weights, which default to rec 601(http://en.wikipedia.org/wiki/CCIR_601) when not specified. The difference between the HSI, HSY and HCI, HCY functions is that HSI and HSY maps to a cyllindrical space using a weighted HSL algorithm. This is useful for colour selectors because the output is more intuitive and has no unexpected shifts in either direction. The HCI and HCY functions on the other hand are the basic formulas and I put them in for compatibility. Implementation: The code is implemented in the advanced colour selector through kis_display_converter, where it creates or converts a qcolor for the proper values. In the advanced color selector itself we can now select shapes that use HSI and HSY, and we can request the MyPaint shade selector to use HSL, HSI and HSY. These options have been added to the settings window, with tooltips and all.
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