Commons talk:Preparing images for upload

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This page is very important and though almost orphaned...--Kozuch (talk) 17:53, 17 September 2009 (UTC)

Bit depth?[edit]

Could someone more knowledgeable than I say something further about what bit depth to scan photos at? — Sam Wilson ( TalkContribs ) … 09:29, 14 May 2013 (UTC)


The advice on this page for JPG is really out-dated and no longer good advice. We should absolutely not encourage users to save a few KB by removing metadata. The comment on blurred JPGs compressing smaller is beside the point -- nobody wants to see a blurred image. That JPEG's can be losslessly compressed is fairly irrelevant and so confusing for a guide intended for new users. The key points we should say are:

  • Use a high quality setting when saving JPG. The maximum quality setting is unlikely to be visibly different to the next step down, and considerably bigger in file size. For example setting 11 (out of 12) in Photoshop or setting 90 (out of 100) in Lightroom results in a very high quality image for reasonable size.
  • Include the EXIF data and colour profile in your JPG. The colour profile, in particular, is essential if you want your image to display in the correct colours in all browsers on all devices. The EXIF often contains information others find useful (such as camera settings) or information concerning copyright, licences and authorship, which should never be removed. If you are concerned the JPG may contain private data such as camera serial numbers, or the geolocation of your house, a tool such as Metadata Wrangler for Lightroom can selectively remove unwanted fields.
  • Try to avoid making repeated edits to a JPG, as the quality deteriorates each time. If an image on Commons needs some adjustment, first contact the author who may have access to the raw files and is better able to fix issues without quality loss.

I am reluctant to edit the page, since it is full of translation tags that I don't understand. -- Colin (talk) 19:58, 14 July 2015 (UTC)

Images to upscale?[edit]

Cross talk link: Commons:Village pump #Images to upscale (recommendation) User: Perhelion (Commons: = crap?)  16:02, 22 November 2015 (UTC)