How to sort images by quality?

Question

PHP

Actually - a subject. There is an image gallery where users upload their pictures. The essence of the task is that on top of the gallery you need to show pictures with the best quality. (Although it is clear that this is quite subjective, it still seems to me that there is some way to more or less evaluate the quality of the picture using the PL). Approximate parameters are brightness, saturation and blur.
For users sometimes fill in full guano, so they don’t want to show them in the top, but on the contrary, somewhere below.
The question is - are there any ready-made libraries, or an algorithm that could be useful? Or at least push in the right direction.
At the moment, I have considered the GD, Imagick and SimpleImage libraries, but I did not find the necessary functionality
Thank you in advance)

Answer 1

2D Fourier transform, spectrum saturation estimation in different frequency domains. All previous ideas + machine learning.

Answer 2

jpeg has this parameter
superuser.com/questions/62730/how-to-find-the-jpg-...

Answer 3

you can try to evaluate the contrast of the image, the sharpness and the number of colors,
it must be assumed that the more unique colors and the greater the contrast, the less agorythms worked there.