Solved by ksz in post #4 
              
              
                To be honest I never used Albumentations. 


Is there an instruction in albumentations that looks like “transforms.Grayscale(num_output_channels = 1)


ToGray(always_apply=False, p=1.0). Here is a demo with code: https://albumentations-demo.herokuapp.com/ 


Is it interesting to use albumentations i…