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Filtering that reddish color can be done fairly easy

• Transfer image to HSV color space
• Make sure that the H channel is in the range 0-50 or 310-360
• Make sure that V is in the range of 0.3-1
• The final combined mask will probably have the reddish colors
• Now apply a mask and set that mask to white, then merge both images together.

Threshold/range values found here: