question about JPG image

[xzhub]

I've read the Q&A about the JPG image issue. I am not quite understand the reason: after loading the image into memory, they are just array numbers, what are the differences between JPG's array(matrix) and PNG's array?

I did a test to convert JPG back to PNG then feed to CBDNet, I can see the result is much better. I am wondering if this is a matplotlib.pyplot/pillow issue? maybe it can not read the JPG data correctly?

BTW, I am using this code since it provides me a easy to use interface: https://gitlab.com/Yggdrasyll/cbdnet-denoiser

Here is the test result.
Origin:

Result directly processed from origin JPG image:

Convert JPG to PNG by Mac's preview, then feed to CBDNet: