How we do transfer learning using pretrained models with grey scale images as input

Question

if we planned to do a training using greyscale images with pretrained model. It will show error. Is there is any method to train these type of images. That means apart from RGB images, how we do the transfer learning

Neeta Dsouza · Accepted Answer

There might be many ways to go about it:
1. Copy and stack the image matrix three times to replicate the 3 channels of RGB
2. Stack two zero or identity matrices on top of the grey image matrix such that the Red channel has all the data and the other two channels are just place holders (not advisable)
3. Remove the other channel weights in the pre-trained model itself (very cumbersome)
 
This is an open-ended problem with many other creative solutions like using DeOldify GAN to color them first or just interpolating the other two channels in some way. The way to find the best solution would be to experiment with your data and pre-trained architecture

How we do transfer learning using pretrained models with grey scale images as input

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