static void CIELabToRGB16(float L, float a, float b, FIRGB16 *rgb) {
float X, Y, Z;
float R, G, B;
const float max_value = 65535.0F;
CIELabToXYZ(L, a, b, &X, &Y, &Z);
XYZToRGB(X, Y, Z, &R, &G, &B);
rgb->red = (WORD)PSD_CLAMP(R * max_value, 0, max_value);
rgb->green = (WORD)PSD_CLAMP(G * max_value, 0, max_value);
rgb->blue = (WORD)PSD_CLAMP(B * max_value, 0, max_value);
}
static void CIELabToRGB8(float L, float a, float b, RGBTRIPLE *rgb) {
float X, Y, Z;
float R, G, B;
const float max_value = 255.0F;
CIELabToXYZ(L, a, b, &X, &Y, &Z);
XYZToRGB(X, Y, Z, &R, &G, &B);
rgb->rgbtRed = (BYTE)PSD_CLAMP(R * max_value, 0, max_value);
rgb->rgbtGreen = (BYTE)PSD_CLAMP(G * max_value, 0, max_value);
rgb->rgbtBlue = (BYTE)PSD_CLAMP(B * max_value, 0, max_value);
}
void Film::WriteImage(Float splatScale) {
// Convert image to RGB and compute final pixel values
std::unique_ptr<Float[]> rgb(new Float[3 * croppedPixelBounds.Area()]);
int offset = 0;
for (Point2i p : croppedPixelBounds) {
// Convert pixel XYZ color to RGB
Pixel &pixel = GetPixel(p);
XYZToRGB(pixel.xyz, &rgb[3 * offset]);
// Normalize pixel with weight sum
Float filterWeightSum = pixel.filterWeightSum;
if (filterWeightSum != 0) {
Float invWt = (Float)1 / filterWeightSum;
rgb[3 * offset] = std::max((Float)0, rgb[3 * offset] * invWt);
rgb[3 * offset + 1] =
std::max((Float)0, rgb[3 * offset + 1] * invWt);
rgb[3 * offset + 2] =
std::max((Float)0, rgb[3 * offset + 2] * invWt);
}
// Add splat value at pixel
Float splatRGB[3];
Float splatXYZ[3] = {pixel.splatXYZ[0], pixel.splatXYZ[1],
pixel.splatXYZ[2]};
XYZToRGB(splatXYZ, splatRGB);
rgb[3 * offset] += splatScale * splatRGB[0];
rgb[3 * offset + 1] += splatScale * splatRGB[1];
rgb[3 * offset + 2] += splatScale * splatRGB[2];
// Scale pixel value by _scale_
rgb[3 * offset] *= scale;
rgb[3 * offset + 1] *= scale;
rgb[3 * offset + 2] *= scale;
++offset;
}
// Write RGB image
::WriteImage(filename, &rgb[0], croppedPixelBounds, fullResolution);
}
