count of distinct colors in a bitmap

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Hello.

I am VERY new to C#. Is there a function that will give me a count of the distinct colors in a bitmap? How about a function that lists all these distinct colors?

Many thanks!

Posted 8-Mar-10 11:34am

gmculp

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3 solutions

Solution 1

A slow but sure approach to this would be to get every pixel in the bitmap and store the color of this pixel. This way you will be able to get all colors that make your bitmap.

Search on the internet and you should get some samples to get a pixel on your bitmap.

Posted 8-Mar-10 12:07pm

Abhinav S

Solution 2

I was hoping to do this with a byte array. I created the byte array but I'm having issues retrieving the RGB values. Am I on the wrong track? Thanks!

Posted 9-Mar-10 7:16am

gmculp

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Kythen · Accepted Answer · 2010-03-09T11:55:00

There is no single function built in to the .Net framework to give you histogram data like this for a bitmap. If you are using the System.Drawing.Bitmap[^] class, you can use the LockBits[^] method to get an BitmapData[^] object with a pointer to the image data and all the information you need about how to access it.