Norrkross Tint is used to adjust the color balance of images. Color adjustments with original color near the pixel color are applied more, whereas color adjustments that differ in original color from the pixel color have little or no effect. This allows the changing of different colors separately (eg. make the gray greener but leave the white and black as they are).
Click in the image to add new color adjustments. You can add both colors that you want to change and colors you want to keep constant.
Click the color in the adjusted column in the color adjustment drawer to set it to set the target color you want. Pixels with color close to the original color will be adjusted to the target color. Letting the target color be the same as the original color for a color adjustment makes colors like the original color remain unchanged.