how to use 16-bit Red, 16-bit Green, 16-bit Blue and 16-bit Alpha values in Color.FromArgb method

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I'm having 4 values of 16bit each: red, green, blue and alpha respectively. I'm trying to use these values in Color.FromArgb method to create a new color. But I'm getting an exception as Red value should be between 0 to 255. but i need to create a bitmap image with 16bit value for each of red, green, blue and alpha colors.. please help me as soon as possible

Posted 1-Dec-12 5:09am

Richa Vats

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Sergey Alexandrovich Kryukov · Answer 1 · 2012-12-01T13:15:00

Solution 1

The actual information per bit depends on the PixelFormat: http://msdn.microsoft.com/en-us/library/system.drawing.imaging.pixelformat.aspx[^].

[EDIT]

As Philippe Mori correctly pointed out in his comment, Color type cannot be used to solve this problem, it is designed to serve only the pixel formats using 8 bits per color component.

[END EDIT]

You can immediately fill in the pixel memory for any pixel format by using System.Drawing.LockBits:
http://msdn.microsoft.com/en-us/library/system.drawing.bitmap.lockbits.aspx[^].

Also, this is the best for performance. WPF also has similar approach.

—SA

Posted 1-Dec-12 13:15pm

Sergey Alexandrovich Kryukov

Updated 2-Dec-12 7:26am

v3

Comments

Philippe Mori 2-Dec-12 8:30am

If you carefully read the documentation for Color.FromRgb, it explicitly says that color are limited to 8 bits (per color channel). Thus, Color class cannot be used in OP case.

Sergey Alexandrovich Kryukov 2-Dec-12 13:22pm

You are right; thank you for correcting me. But second part of my answer is a solution.
I'll remove redundant part.
--SA

Sergey Alexandrovich Kryukov 2-Dec-12 13:26pm

Done, you correction is credited, after [EDIT].
Thank you again,
--SA