jpg_function.rar_BLUE

void RGBto422 (unsigned char *rgb, unsigned char *yuv, int width, int height) { int r, g, b, Y1, Cb1, Cr1, Y2, Cb2, Cr2, x, y; for(y = 0; y<height; y++) for(x = 0; x < width; x += 2) { r = *rgb++; g = *rgb++; b = *rgb++; Y1 = 0.2989 * r + 0.5866 * g + 0.1145 * b; Cb1 = (b - Y1) / (2. - 2. * 0.1145); Cr1 = (r - Y1) / (2. - 2. * 0.2989); r = *rgb++; g = *rgb++; b = *rgb++; Y2 = 0.2989 * r + 0.5866 * g + 0.1145 * b; Cb2 = (b - Y2) / (2. - 2. * 0.1145); Cr2 = (r - Y2) / (2. - 2. * 0.2989); *yuv++ = (unsigned char) (128 + (Cb1 + Cb2) / 2) * 224./255.+ 16; *yuv++ = (unsigned char) Y1 * 219./255/ + 16; *yuv++ = (unsigned char) (128 + (Cr1 + Cr2) / 2) * 224./255.+ 16; *yuv++ = (unsigned char) Y2 * 219./255/ + 16; } } //a nd for completeness 411: void RGBto420 (unsigned char *rgb, unsigned char *yuv, int width, int height) { int r, g, b, Y1, Cb1, Cr1, Y2, Cb2, Cr2, Y3, Cb3, Cr3, Y4, Cb4, Cr4, x, y; for(y = 0; y<height; y += 2) for(x = 0; x < width; x += 2) { r = *rgb; g = *(rgb+1); b = *(rgb+2); Y1 = 0.2989 * r + 0.5866 * g + 0.1145 * b; Cb1 = (b - Y1) / (2. - 2. * 0.1145); Cr1 = (r - Y1) / (2. - 2. * 0.2989); r = *(rgb+3); g = *(rgb+4); b = *(rgb+5); Y2 = 0.2989 * r + 0.5866 * g + 0.1145 * b; Cb2 = (b - Y2) / (2. - 2. * 0.1145); Cr2 = (r - Y2) / (2. - 2. * 0.2989); r = *(rgb+3*width); g = *(rgb+3*width+1); b = *(rgb+3*width+2); Y3 = 0.2989 * r + 0.5866 * g + 0.1145 * b; Cb3 = (b - Y3) / (2. - 2. * 0.1145); Cr3 = (r - Y3) / (2. - 2. * 0.2989); r = *(rgb+3*width+3); g = *(rgb+3*width+4); b = *(rgb+3*width+5); Y4 = 0.2989 * r + 0.5866 * g + 0.1145 * b; Cb4 = (b - Y4) / (2. - 2. * 0.1145); Cr4 = (r - Y4) / (2. - 2. * 0.2989); *yuv++ = (unsigned char) Y1 * 219./255/ + 16; *yuv++ = (unsigned char) Y2 * 219./255/ + 16; *yuv++ = (unsigned char) Y3 * 219./255/ + 16; *yuv++ = (unsigned char) Y4 * 219./255/ + 16; *yuv++ = (unsigned char) (128 + (Cb1 + Cb2 + Cb3 + Cb4) / 4) * 224./255. + 16; *yuv++ = (unsigned char) (128 + (Cr1 + Cr2 + Cr3 + Cr4) / 4) * 224./255. + 16; rgb += 6; } } void RGBto411 (unsigned char *rgb, unsigned char *yuv, int width, int height) { int r, g, b, Y1, Cb1, Cr1, Y2, Cb2, Cr2, Y3, Cb3, Cr3, Y4, Cb4, Cr4, x, y; for(y = 0; y<height; y++) for(x = 0; x < width; x += 4) { r = *rgb++; g = *rgb++; b = *rgb++; Y1 = 0.2989 * r + 0.5866 * g + 0.1145 * b; Cb1 = (b - Y1) / (2. - 2. * 0.1145); Cr1 = (r - Y1) / (2. - 2. * 0.2989); r = *rgb++; g = *rgb++; b = *rgb++; Y2 = 0.2989 * r + 0.5866 * g + 0.1145 * b; Cb2 = (b - Y2) / (2. - 2. * 0.1145); Cr2 = (r - Y2) / (2. - 2. * 0.2989); r = *rgb++; g = *rgb++; b = *rgb++; Y3 = 0.2989 * r + 0.5866 * g + 0.1145 * b; Cb3 = (b - Y3) / (2. - 2. * 0.1145); Cr3 = (r - Y3) / (2. - 2. * 0.2989); r = *rgb++; g = *rgb++; b = *rgb++; Y4 = 0.2989 * r + 0.5866 * g + 0.1145 * b; Cb4 = (b - Y4) / (2. - 2. * 0.1145); Cr4 = (r - Y4) / (2. - 2. * 0.2989); *yuv++ = (unsigned char) Y1 * 219./255/ + 16; *yuv++ = (unsigned char) Y2 * 219./255/ + 16; *yuv++ = (unsigned char) Y3 * 219./255/ + 16; *yuv++ = (unsigned char) Y4 * 219./255/ + 16; *yuv++ = (unsigned char) (128 + (Cb1 + Cb2 + Cb3 + Cb4) / 4) * 224./255. + 16; *yuv++ = (unsigned char) (128 + (Cr1 + Cr2 + Cr3 + Cr4) / 4) * 224./255. + 16; } }