How to find that all pixels in an image are grey scale or has R,G,B equal value for each individual pixel

Question

Please dont quote this How can I check the color depth of a Bitmap? or How to check if a picture is in grayScale

Because an image can be 24/32 bit per pixel even if

Answer 1

Bitmap.GetPixel() returns a Color structure which has fields R, G and B so you can just compare them however you want.

Do note that using GetPixel() is very slow, but if you don't need speed it will do.

Answer 2

Ok you need to take the RGB components of a bit sequence. Lets say the sequence is 24 bits so you have the following bit sequence:

RRRRRRRRGGGGGGGGBBBBBBBB

WhereR is a bit for red, G is a bit for green and B is a bit for blue. To separate this you can do it with bitwise operators.

color = Bitmap.GetPixel(iCounter, iCount).ToArgb();
blue  = color & 0xFF;          // Get the 1st 8 bits
green = (color >> 8)  & 0xFF;  // Remove the 1st 8 bits and take the 2n 8 bits
red   = (color >> 16) & 0xFF;  // Remove the 1st 16 bits and take the 3rd 8 bits