how to view dark image mask with class labels in rgb?

Open your mask (pixel value of 0, 1, 2, ...) using a normal image viewer only results in a dark image.

You can use:

• Fiji

  • Image > Adjust > Color Balance > Auto
  • Image > Adjust > Color Balance > Set > change 0~255 to 0~5 (assume: your class labels are 0 to 5)
  • (For tif files. To see all pages at once, go to the menu: Image > Stacks > Make Montage...)
  • (reference: DigitalSreeni-[208 - Multiclass semantic segmentation using U-Net] https://www.youtube.com/watch?v=XyX5HNuv-xE)

• XnView MP

  • Tool Bar > bar below > Automatic levels (ctrl alt l)

• FastStone Image Viewer

  • Tool Bar > Colors > Auto Adjust Colors (ctrl shift b)