Deletion of Image conversion

Comment: As is, it's verging on #MANUAL. We don't do how-tos, per se, here. On the other hand a general discussion of this topic could cover several aspects such as histograms and lossless vs. lossy formats. Some of that is probably in other articles, though, so I'm not sure what the holes are here
Stance: comment
Cited policy: Wikipedia:What Wikipedia is not (WP:NOT)