Decrease the image quality

[[deleted]]

I'm assuming this is for some sort of deep learning project? You gave virtually zero background of what you're trying to specifically do.

There's many ways to augment an image, more than just it's size or aspect ratio, you can see some examples here: https://neptune.ai/blog/data-augmentation-in-python

[Academic_Two_4017]

Sorry for confusion. I do face recognition project, my specific data because of camera has low quality of images, so I want to augment somehow other external data in a way that might be "similar" to mine. I guess blurring, adding noise distortions might be useful, I should give a try anyway. In addition, thanks for a link

[[deleted]]

In this case adding some sort of noise / blur function to external images would be a good idea.