User talk:The Great Butler

Revision as of 00:45, 5 August 2008 by Nyoo (talk | contribs) (New page: I'm writing these hints because of Image:Vlcsnap-175816.png and Image:Vlcsnap-175535.png. It would be better if you uploaded movie screenshots as JPG. PNG may be great for lossl...)
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I'm writing these hints because of Image:Vlcsnap-175816.png and Image:Vlcsnap-175535.png.

It would be better if you uploaded movie screenshots as JPG. PNG may be great for lossless archiving and it is the preferred format for simpler images like sprites and diagrams where it plays out its benfits over JPG: A sprite saved as JPG would look awful. If you use JPG in a rather high compression setting of 80 to 95, it should be just fine on images like photos AND anime screenshots whereas it wouldn't on a sprite.

Images with more complex colors such as photos and TV and movie screenshots (yes, usuallly anime and cartoons as well) can be compressed with JPG, because it is more suitable and artifacts don't turn out as bad as on a less complex sprite or diagram. Saying that JPG is generally bad for its lossiness isn't right, since that only gets significant when high compression is applied that really destroys alot of the image or when it gets compressed alot of multiple times. And since the screenshot is most likely from a video with a lossy video compression format already, most detail that you might have been able to retain with PNG ist lost aready anyway. In this case, I doubt there is any such detail to retain since it's an analogue TV screenshot.

The reason to not use PNG in such cases is because it generates huge filesizes that seem pointless when used on images that could be saved in JPG without significant loss of quality.

The last hint is that you should use more helpful filenames than "vlcsnap-SOMENUMBER", as it also says in the upload form to use a descriptive and concise title. --Nyoo 00:45, 5 August 2008 (UTC)