X Y Coordinates for BitmapData

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.NET3.5

Hi,

Could anybody explain how to find X and Y Coordinates from BitmapData Array. Also how to scan a specific area of a image for specific color pixels. The Image size is 1280x1024 24bit, I need to scan in area between X: 50-150 & Y: 500-1000 for the color black. Also, I don't want to use Rectangle because after scanning the specific area if the result is success then the respective pixel's X and Y coordinates are used for calculating other pixels in the same image which are outside of this area.

Thanks

Posted 19-Dec-12 5:03am

Member 8741232

Updated 19-Dec-12 5:10am

v3

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BC @ CV · Answer 1 · 2012-12-19T11:07:00

Solution 1

in the System.Drawing.Bitmap object you can use the GetPixel(x, y) to find the color of a pixel.

C#

Bitmap bmp = new Bitmap(@"C:\test.bmp");
for (int x = 0; x < 151; x++)
    for (int y = 500; y < 1001; y++)
        if (bmp.GetPixel(x, y).ToArgb() == Color.Black.ToArgb())
            MessageBox.Show("I found black!");

Posted 19-Dec-12 11:07am

BC @ CV

Updated 19-Dec-12 11:27am

v4

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Member 8741232 20-Dec-12 5:09am

Hi, Thanks for making a attempt. I too am using the same, but its too slow. Thus thought of using LockBits/UnlockBits to process image faster.

BC @ CV · Answer 2 · 2012-12-20T04:36:00

Solution 2

This article seems to be what your looking for.
Work with bitmaps faster in C#[^]

Posted 20-Dec-12 4:36am

BC @ CV

X Y Coordinates for BitmapData

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X Y Coordinates for BitmapData

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