Keith Turkowski

Here's how you can do this more precisely using only the Curves+ plugin by pyrochild. https://forums.getpaint.net/topic/7291-pyrochild-plugins-2017-12-04/ Original Image (Layer 1) Duplicate to Layer 2 Switch to Layer 2 Magic Wand Select (Global, 0% tolerance) background Delete Adjustments -> Hue / Saturation Lightness: -100 Magic Wand Select (Contiguous, 0% tolerance) portions of Layer 2 that are the same color as each other Switch to Layer 1 Copy Paste into new Layer 3 (or 4, 5, 6, etc.) Repeat previous Step 2.3 for each distinct color in Layer 2 Switch to Layer 3 (or 4, 5, 6, etc.) Adjustments -> Black and White Magic Wand Select (Global, 0% tolerance) background Delete Use color picker to select the greyscale color of the portions in Layer 3 Expand Colors -> More Adjustments -> Curves+ (by pyrochild) -> Advanced In: Value / Brightness Out: Alpha) Invert the Curve, straight diagonal line from top left (0,255) to bottom right (255, 0) Adjust the curve with a third point to the greyscale value (from the color picker) on the top edge (<value>, 255) Note: if the original image background wasn't white You'll probably need to set a fourth point on the bottom edge to the greyscale value of the background (<value>, 0) Magic Wand Select (Global, 0% tolerance) background Delete Adjustments -> Hue / Saturation Lightness: -100 Switch to Layer 1 Use color picker to select the color of the portions in Layer 3 Expand Colors -> More Switch back to Layer 3 Adjustments -> Curves+ (by pyrochild) -> RGB Select Red ONLY, adjust the curve to the R: value on the left edge (0, <red value from color picker>) Select Green ONLY, adjust the curve to the G: value on the left edge (0, <green value from color picker>) Select Blue ONLY, adjust the curve to the B: value on the left edge (0, <blue value from color picker>) Repeat Steps 3.1 to 3.10 for each layer created in step 2.3 Note: If the different colors overlap with each other, you'll need to find a solution to fix the borders at the overlaps (e.g. use lasso select to copy from the original image).