Suport de The Movie Database
Suport → Suport del lloc web
Image Compression Algorithm
publicat per DaelinSTAFFMOD el dia 28 , de 2018 a les 11:42 P.M.
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
Resposta per lineker
el 29 , de 2018 a les 7:20 A.M.
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.
Resposta per Daelin
el 30 , de 2018 a les 7:27 A.M.
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.
Resposta per lineker
el 30 , de 2018 a les 10:19 A.M.
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.
Resposta per Travis Bell
el 30 , de 2018 a les 11:03 A.M.
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.
Resposta per Daelin
el 1 de 2018 a les 5:21 A.M.
Okay, fair enough.
You can probably remove the duplicate image https://image.tmdb.org/t/p/original/5jFVck5TItyVu7bya3IZAgRMAFd.jpg now then.
Resposta per lineker
el 1 de 2018 a les 6:01 A.M.
Image deleted. Closing topic.