CODEWITHSUNDEEP
c#arraysrgbpixel
Saad
Saad

Reputation:

how to decompose integer array to a byte array (pixel codings)

Hi sorry for being annoying by rephrasing my question but I am just on the point of discovering my answer.

I have an array of int composed of RGB values, I need to decompose that int array into a byte array, but it should be in BGR order.

The array of int composed of RGB values is being created like so:

pix[index++] = (255 << 24) | (red << 16) | blue;

Upvotes: 1

Views: 5661

Answers (5)

gam6itko
gam6itko

Reputation: 15888

Try to use Buffer Class 

byte[] bytes = new byte[ints.Length*4];
Buffer.BlockCopy(ints, 0, bytes, 0, ints.Length * 4);

Upvotes: 1

user21826
user21826

Reputation: 3644

C# code


        // convert integer array representing [argb] values to byte array representing [bgr] values
        private byte[] convertArray(int[] array)
        {
            byte[] newarray = new byte[array.Length * 3];

            for (int i = 0; i < array.Length; i++)
            {

                newarray[i * 3] = (byte)array[i];
                newarray[i * 3 + 1] = (byte)(array[i] >> 8);
                newarray[i * 3 + 2] = (byte)(array[i] >> 16);

            }
            return newarray;
        }

Upvotes: 4

Jay Bazuzi
Jay Bazuzi

Reputation: 46496

Using Linq:

        pix.SelectMany(i => new byte[] { 
            (byte)(i >> 0),
            (byte)(i >> 8),
            (byte)(i >> 16),
        }).ToArray();

Or

        return (from i in pix
                from x in new[] { 0, 8, 16 }
                select (byte)(i >> x)
               ).ToArray();

Upvotes: 1

Can Berk G&#252;der
Can Berk G&#252;der

Reputation: 113300

#define N something
unsigned char bytes[N*3];
unsigned int  ints[N];

for(int i=0; i<N; i++) {
    bytes[i*3]   = ints[i];       // Blue
    bytes[i*3+1] = ints[i] >> 8;  // Green
    bytes[i*3+2] = ints[i] >> 16; // Red
}

Upvotes: 1

Baczek
Baczek

Reputation: 1247

r = (pix[index] >> 16) & 0xFF

the rest is similar, just change 16 to 8 or 24.

Upvotes: 0

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