What are the rules that determine what and how uploaded images get re-compressed? For example, I've recently uploaded the following poster image which was Saved for the Web at a quality level of 80 from Photoshop: http://kultiras.net/pics/GothamGirls.jpg Upon upload it has been re-compressed with some pretty noticeable artifacts. https://image.tmdb.org/t/p/original/5jFVck5TItyVu7bya3IZAgRMAFd.jpg
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Reply by lineker
on April 29, 2018 at 7:20 AM
Hi, I'm not sure how this works on site, but my instructions have always been to add the highest quality possible. Since I don't use Photoshop I'm not sure if level 80 is good or not, but for most programs I would want to go with at least 95 to ensure top quality. Often I use 98. Can you try saving in quality 95 and then re-add? That way we can see whether that setting is a problem or not.
Reply by Daelin
on April 30, 2018 at 7:27 AM
I've tried outputting the file with a quality of 95, but uploading to here is still then adding more compression after the fact. Here is the file with a quality of 95: http://kultiras.net/pics/GothamGirls2.jpg And here it is after it was uploaded: https://image.tmdb.org/t/p/original/nx5288muDMdOM5fNHEovKYEnDCo.jpg
It's probably only really noticeable with this file because of parts like the flat reds and purple gradients that don't play well with JPEG compression.
Reply by lineker
on April 30, 2018 at 10:19 AM
I think that must be the case. I haven't really thought about it before. However, now that I think of it, there have been a few old cases of posters with red in them that had the same slight issue.
Reply by Travis Bell
on April 30, 2018 at 11:03 AM
Yes, reds are the worst colour to try and compress.
The current image service is using a dynamic system that calculates the compression on a per image (and size) basis so every image is compressed differently. We do compress just a tad on the high side (by design) but that's just how we gotta roll due to TMDb being a free service and bandwidth being our single biggest expense.
But no matter what, always upload the best quality asset you can. That will at least give the system the best quality source file to work on.
Reply by Daelin
on May 1, 2018 at 5:21 AM
Okay, fair enough.
You can probably remove the duplicate image https://image.tmdb.org/t/p/original/5jFVck5TItyVu7bya3IZAgRMAFd.jpg now then.
Reply by lineker
on May 1, 2018 at 6:01 AM
Image deleted. Closing topic.