Why are you uploading images under a brand new name, then replacing older images in articles with them? That's a practice known as "orphaning", where you leave an older image without any articles for it to be displayed on.
You obviously know how to replace pre-existing images by uploading over them (which is an acceptable practice) since you've done it before, so why aren't you doing that now? --UltimateKuriboh (talk • contribs) 18:17, 29 December 2020 (UTC)
- No problem. But in the last cases I just uploaded new versions of already existing files which were .jpgs. Yuga89 (talk • contribs)
- Just to clarify: the reason PNGs are preferred is because PNG is a lossless format, which means an image saved as a PNG doesn't get any new compression artifacts or lose any more information. By contrast, an image saved as a JPEG has some information loss from being saved, with compression artifacts appearing (though they may not actually be visible even with very careful inspection). Therefore, generally there's no point in just resaving JPEGs as a PNG; the information loss that happened when the image was first saved as a JPEG is still there in the PNG. Instead, replacement should involve creating a new image from the original source material, directly as a PNG, or finding the original source of the JPEG and hoping it was saved as PNG or a similar lossless format. This does mean that sometimes, it's just not possible to replace JPEG files, and that's fine. 「ディノ奴千？！」☎ Dinoguy1000 20:07, 22 July 2021 (UTC)
- I just use this extension: https://chrome.google.com/webstore/detail/save-image-as-png/nkokmeaibnajheohncaamjggkanfbphi?hl=en, or if you're using Lightshot or any screenshotting tool, make sure it's in your settings that it saves the screenshots as PNGs. MadRest (talk • contribs) 20:57, 22 July 2021 (UTC)
- That doesn't do anything useful if you use it on a JPEG. The information loss happens when the JPEG is saved, and resaving as a PNG (regardless of whether you do it by downloading the image, opening it in an image editor, and saving/exporting as PNG; or via a "Save as PNG" browser extension, or whatever other method you might think up) cannot reverse that information loss. For example, try saving this image using the "Save as PNG" extension, and compare the resulting PNG visually against the original JPEG - note that all of the very obvious compression artifacts in the JPEG remain untouched in the PNG. 「ディノ奴千？！」☎ Dinoguy1000 22:19, 22 July 2021 (UTC)
- I think we've had this same exact discussion before? The reason we want PNG images is not because of information loss, but because when we resize images for our thumbnails here, JPGs suffer from horrendous visual grain, unlike PNGs, which retain their original quality. And of course if you save an already-grainy image as a PNG, it won't undo the grain. I'm not saying the Save as PNG extension is a quality improver; it just serves to easily convert a JPG to a PNG image, but naturally you're supposed to find the JPG at a good quality in the first place. MadRest (talk • contribs) 23:05, 22 July 2021 (UTC)