Handle Transparency in evaluate.py about fast-style-transfer

[jonobr1]

So I noticed that you can change the format handled for the incoming images here: https://github.com/lengstrom/fast-style-transfer/blob/master/src/utils.py#L16 which I changed from RGB to RGBA based on the SciPy documentation. I get a new error saying Assign requires shapes of both tensors to match. My hunch is that I need to generate a checkpoint that's also RGBA format. Will continue to poke around and post updates here.

[lengstrom]

I think your goal is pretty underspecified right now. I'm not sure what "when alpha = 0 the style transfer isn't applied" means.

[onyedikilo]

He probably means that he has an RGBA image with an alpha channel as the transparency and he wants the style to apply only to the pixels where there is no transparency (opaque). Like an alpha mask.