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Different levels of compression for images
softpillowSTAFFMODによって2025年05月01日の5:34 AMに投稿
A mod has, in previous conversation said that images uploaded to this site may receive different amounts of loss in quality due to the compression that occurs on this site. I can no longer remember or find that previous conversation, but I would like to know if someone (preferrably a mod) can expand on why that happens, and more importantly if there is any way to predict which images are more likely to experience greater amounts of loss in quality (due to compression) from uploading. And in consequence, also which images are more likely to experience lesser if not almost negligible changes in quality.
One way this would be beneficial is being able to predict how an image is actually going to look like once its uploaded (which helps determine the "true" - or eventual quality of an image that you are considering to upload)....unless there is no way to know/its all just random?
Travis Bellからの返信
投稿：2025年05月02日 12:34 PM
Hi @softpillow, the original source JPEG's are encoded at 85% quality, standard across the board. However, this may not be the file you see in your browser since we do serve optimized WEBP files if your browser asks for them.
Most browsers have an extension that will let you download the source JPEG. This is one for Chrome as an example. This can let you compare the two versions side by side. Bottom line though, if you're only concerned with JPEG's, they're encoded at 85%.
softpillowからの返信
投稿：2025年05月03日 3:27 PM
How do I know if my browser asks for them (optimized WEBP files)? (eg. Is it based on what type of browser I'm using? eg. chrome vs firefox vs opera vs brave, etc.)
or do i just have to test it out myself and see if images from this site look the same downloaded (source JPEG) vs. viewed on a browser/internet/url?
Travis Bellからの返信
投稿：2025年05月04日 1:01 PM
Pretty much all major browsers today support WEBP, so generally you can just assume that's what you're looking at.
softpillowからの返信
投稿：2025年05月06日 11:30 PM
oh WOW....
I just tested it (that chrome extension) out with one image I uploaded... the difference is HUGE
So ultimately the actual quality of an image on this site isnt the way it looks when you open it on the browser, but when you download its source JPG? So when it comes to determining what images on the site are low quality or high quality it really should be done by looking at the downloaded source JPG and not how it looks when you just click on it right? In that case unless the mods are downloading the source JPG images when they look at image reports perhaps Ive gotten thousands of good images deleted from this site...
...or should we still judge which images to delete based off the way they look as WEBP?