Test time python script output fail

[RichardoTiono]

Hello,
I would like to ask regarding the test time script. I have tried to input a grayscale image but it always fails to colorize it and when I tried the sample command that is provided, I noticed that it request input of colored image instead of grayscale and somehow it output a grayscale image. So did I do something wrong or in order to try this model I need to retrain from scratch?
Thank you