Works for me. gmic med0.jpg med1.jpg balance_gamma , blend_median o med2.jpg
When you save the image, be sure you don’t clip it. E.g., if you do gmic med0.jpg med1.jpg balance_gamma , blend_median * 257 cut 0,255 o med2a.jpg, you get
Since I don’t have your original files, I can’t tell you exactly what to do. The above happens when you save something with a lower range than your data, or your image viewer doesn’t support the bit depth, and so the upper range is clipped.
@Reptorian You may have any number of input images.