Alan

That solves GetHue() because Cast(loColor.GetHue() As Integer gives a result of 0, but what about DarkGray GetBrightness returning 38174 ?

Also DarkSalmon RGB(233,150,122) is returning: R = 0 G = 0 B = 0 Cast(GetHue() As Integer) = 0 Cast(GetSaturation() As Integer) = 0 Cast(GetBrightnes() As Integer) = 0

Paul

On 30/06/2022 16:31, Alan Bourke wrote:

Try Cast(loColor.GetHue() as Integer) or Cast(loColor.GetHue() as Numeric(12, 2)) ...

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You are right Alan so I have implemented conversion routines based on the following

https://www.rapidtables.com/convert/color/hsl-to-rgb.html https://www.rapidtables.com/convert/color/rgb-to-hsl.html

I also found this site useful for checking results

http://www.workwithcolor.com/color-converter-01.htm

I will look into how GDIPlusX does its calculations for H, S and L.  Do you have a link for these conversions in .NET?

Paul

I also found this site useful for checking results On 01/07/2022 09:17, Alan Bourke wrote:

I don't think its implementation of these methods is correct Paul, comparing with what .NET would return.

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Except Microsoft which uses 0-255 !

On 01/07/2022 14:41, Alan Bourke wrote:

Paul

The .NET syntax is very similar:https://dotnetfiddle.net/b2uIkS

However it returns the lightness value in a range of 0 .. 1 so you have to multiply by 100 to express in a % which seems to be how everyone else does it.

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