Translations:Commons:First steps/Quality and description/58/en
PNG should be reserved for images that require high quality and/or that it can more easily compress, such as computer screenshots (or diagrams only available in raster form). Do not save JPEG images as "progressive".[1] Please optimize JPEG images (this reduces size at no cost to decoding).[clarification needed]
- ↑ Progressive images break the thumbnailer, because the whole image must be rendered, thus exhausting memory. See archived discussion and example.