Image resolution in uploading

[CristianMorGarcia]

Is your feature request related to a problem? Please describe.
More than a problem, it is an improvement. We have tags related to the resolution, like high-resolution, or absurd-resolution tags. It can be a great help at the time of uploading to see if the resolution truly it is better than others uploaded, or if I downloaded a smaller size one.

Describe the solution you'd like
Add a field upon uploading the image below the preview, telling the resolution of that image.

Describe alternatives you've considered
Apart from downloading, and going the slow way of reviewing that myself, not others. The other is to put the tags upon upload depending on the size, but I view that as so much more difficult than this manual option.