Here is small sample if somebody not want to dig it.
void yuv2rgb() {
     // This code partially based on code from http://www.mikekohn.net/stuff/image_processing.php#download
     unsigned char *frameBuffer;
     unsigned int idxFrame, xx, yy;
     int y, u, v, r, g, b, u1, uv1, v1, y1;
 
     // Current frame buffer
     frameBuffer = (unsigned char *)FRAME_BUF;
     // Format is U Y1 V Y2, where Y1 and Y2 is brightness for pixels #1 and #2.  
     // U and V are common for both pixels.
     for(yy = 0; yy < imgHeight; yy++) {
           // Step each two pixels
           for(xx = 0; xx < imgWidth; xx += 2) {            
                 idxFrame = index(xx, yy);
                 // Common part for both pixels
                 u = frameBuffer[idxFrame];                  // U component
                 v = frameBuffer[idxFrame + 2];      // V component
 
                 // Start YUV -> RGB conversion
                 u -= 128;
                 v -= 128;
                 v1 = (5727 * v);
                 uv1 = -(1617 * u) - (2378 * v);
                 u1 = (8324 * u);
 
                 // Pixel #1
                 y = frameBuffer[idxFrame + 1];                        
                 
                 y1 = y << 12;
                 r = (y1 + v1) >> 12;
                 g = (y1 + uv1) >> 12;
                 b = (y1 + u1) >> 12;
                 if (r > 255) r = 255;
                 else if (r < 0) r = 0;
                 if (g > 255) g = 255;
                 else if (g < 0) g = 0;
                 if (b > 255) b = 255;
                 else if (b < 0) b = 0;
                 
                 // Use (rgb) for pixel #1
                 //putchar(r); putchar(g); putchar(b);
 
 
 
                 // Pixel #2
                 y = frameBuffer[idxFrame + 3];
                 
                 y1 = y << 12;
                 r = (y1 + v1) >> 12;
                 g = (y1 + uv1) >> 12;
                 b = (y1 + u1) >> 12;
                 if (r > 255) r = 255;
                 else if (r < 0) r = 0;
                 if (g > 255) g = 255;
                 else if (g < 0) g = 0;
                 if (b > 255) b = 255;
                 else if (b < 0) b = 0;
 
                 // Use (rgb) for pixel #2
                 //putchar(r); putchar(g); putchar(b);
           }
     }
}

I wonder if you switch that register if vc, vb, blob() etc. will work the same (except using rgb values, of course)... I suspect they will since the color values are still 3 8-bit values - I don't think it matters beyond that as far as the code goes.

How exactly can you change the register to RGB?