Question about array values

[elliptic]

So I have an array (several, actually), which holds the RGB values of an image. I'm then doing some calculations with each of these arrays (let's say we're doing Red. Then Red[i][j] is the intensity of "redness" at the pixel (i,j)). Red is of type int, raster is of type uint32. My calculations depend on Red[i][j] being some nice number less than 256. When I run gdb, and tell it to print Red[7], for example, I get something along the lines of

 (int*) 0xd3ff20

.
Can anyone tell me why it is doing this? Thanks.
Here is the relevant (hopefully) code

raster = (uint32*) _TIFFmalloc(npixels * sizeof(uint32));
    if (raster == NULL) printf("no memory");
    TIFFReadRGBAImage(tif, w, h, raster, 0); 
    for (i = 0; i<h; i++)
    {
        for (j = 0; j<w; j++)
        {

            z = raster[i*w + j]; 
            Red[i][j] = (z & 0xff);
            Grn[i][j] = ((z>>8) & 0xff);
            Blu[i][j] = ((z>>16) & 0xff);

        }
    }

[jafet]

Because red[7] is an array itself, and gets printed as a pointer. You do know pointers and arrays well, don't you?

[elliptic]

Oh. I thought that Red[7] would decompose to Red[0][7]. Sorry.

[VirtualAce]

A speedup:

raster = (uint32*) _TIFFmalloc(npixels * sizeof(uint32));
    if (raster == NULL) printf("no memory");
    TIFFReadRGBAImage(tif, w, h, raster, 0); 

    DWORD dwOffset=0;
    DWORD dwMaxOffset=w*h;
    DWORD dwColor=0;

    do
    {
       dwColor=raster[dwOffset];
 
       Red[dwOffset]=(dwColor & 0xFF);
       Grn[dwOffset]=((dwColor>>8) & 0xFF);
       Blu[dwOffset]=((dwColor>>16) & 0xFF);

       dwOffset++;
    } while (dwOffset<dwMaxOffset);

One offset. One multiply. Linear array traversal.

[King Mir]

1) Use descriptive variable names, expecially if you have other people read your code.

2) For values less than 256 you can use unsigned char.