ImageJ: overlay two images together

Sometimes, you need to compare the differences between two images in ImageJ; or you want to overlay the ROI mask on the original images. The easiest way to do is:

  1. make sure two images are in 8bit type (change them in Image > Type);
  2. Then, go to Image > Color > Merge Channels;
  3.  Use the original as Gray and the binary as one of the colors (green shows up well).

 

 

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