Super Accurate Color Match Technique in GIMP

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First and foremost, create a check layer to better match the colour and lightness of the image.

Match the levels of the image with the help of black and white check layers.

Check Layer

  1. Create a new layer
  2. Fill it with black.
  3. Set the blending mode to LCH color.

Match Process

Use the levels tool (you can also use curves, if you like) to match the levels of your image.

(Match the luminosity by using sliders in levels, try to match it with the black levels and white levels of the background.)

 

Match the color of the image using the color check layer.

Check Layer

  1. Create a new layer
  2. Fill it with gray.
  3. Set the blending mode to Luminance.

Match Process

Use colour balance to match the color.

(With the check layer enabled, you can now move the color sliders to the color you want to match your background color.)

 

Extra

Add depth to the background.

By adding focus blur (you can also add bokeh by increasing the highlight factor)

 

Darkening the unwanted light area

  1. Create a layer group
  2. Put all the layers in that group.
  3. Create a new layer and fill it with black.
  4. Set the blending mode to multiply and add a layer mask to that layer.
  5. Then paint the layer mask with white using a hard brush.
  6. Then blur the mask to soften the darkness.

 

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