Need to calculate the Value of a pixel

Question

I have a RGBA values, R - 255, G - 103, B - 103, Alpha - 103.

Need combination of the (RGB) color value. Example - 26532.(combination of colour value/Pixel value)

Description - Image is made of pixels, each pixel has combination of colors(like - RGB). Need to calculate the mean of the image and we need to have the unique value of the pixel. Each pixel has 4 colour values but need the pixel value( combination of colour values)

How would *you* calculate that "value of a pixel"? Do you know how to get the ARGB value? — Hans Keﬆing, Sep 12 '11 at 08:21

score 2 · Answer 1 · answered Sep 12 '11 at 08:23

You can use BitConverter to convert the RGBA bytes to a single int value:

        byte[] components = new byte[4];
        components[0] = 103;        // blue
        components[1] = 103;        // green
        components[2] = 255;        // red
        components[3] = 103;        // alpha

        int pixelValue = BitConverter.ToInt32(components, 0);

score 0 · Answer 2 · edited May 23 '17 at 12:12

0

You should be able to do a loop through every pixel, and calculate the pixel value on the fly if you know the pixel color values.

Relevant questions:

How can I iterate through each pixel in a .gif image in C#?

How to calculate the average rgb color values of a bitmap

edited May 23 '17 at 12:12

Community

1
1

answered Sep 12 '11 at 08:25

Sprunth

725
6
10

score 0 · Answer 3 · answered Sep 12 '11 at 08:27

0

int value = Color.FromArgb(103, 103, 255, 103).ToArgb()

answered Sep 12 '11 at 08:27

Felix C

1,755
5
26
40

i got the result using this code. int r = objcolor.R; int g = objcolor.G; int b = objcolor.B; int rgb = ((r & 0x0ff) << 16) | ((g & 0x0ff) << 8) | ((b & 0x0ff)) – Yasar Sep 12 '11 at 13:39

Need to calculate the Value of a pixel

3 Answers3