How to convert UIRibbon type UI_HSBCOLOR to COLORREF and vice versa

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How to convert UIRibbon type UI_HSBCOLOR to COLORREF and vice versa

harborsiem 1

How to convert UIRibbon type UI_HSBCOLOR to COLORREF and vice versa.
Is there any api or code that I can use for a converter (translator) for the ribbon specific type UI_HSBCOLOR to COLORREF (or .NET Color type). The Microsoft documentation Convert RGB to HSB
is not really helpful because there are different converters for RGB to HSL with different results. The colors I get or set with these converters are not really the same I can see in the Ribbon.
Any help possible ?

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Answer 1

Castorix31 90,696

There are some functions in the Shell :
ColorHLSToRGB
ColorRGBToHLS
or in MS sources :
ColorConversion.cpp
How To Converting Colors Between RGB and HLS (HBS)

harborsiem 1 Reputation point

2023-01-08T16:36:20.437+00:00
@Castorix31 : Thanks for the hint to the Shell functions and the other sources. I recognize that the Shell functions have a range from 0 to 240 for H, S, L values. So I have done a pull request for the documentation for these functions.
I have tried all functions and compared them with functions I tried before. But I get no success for a good result value.

For comparing a good result value I have done the following steps:

I build a Ribbon application in C# WinForms.

I read the UI_HSBColor for the ApplicationButtonColor which have the text "File" (english version). I get a value 0x73C793. 0x73 is Brightness, 0xC7 is Saturation, 0x93 is Hue. All values in the range 0 to 255.

Then I make a screenshot of the Ribbon app and copy it by Microsoft Paint. I cut the ApplicationButton and save it to a 24 bit Bitmap file. With a HexEditor I can see a RGB-Color 0x0066B4 for the Background of ApplicationButton.

I think the secret doing the correct conversion is inside the code of the UIRibbon.

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How to convert UIRibbon type UI_HSBCOLOR to COLORREF and vice versa

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