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Image File Size Compression On Airliners.net  
User currently offlineSulman From United States of America, joined Mar 2004, 2041 posts, RR: 28
Posted (11 years 5 months 3 weeks 6 days 21 hours ago) and read 5545 times:

Hi All,

I understand from the upload page that a.net uses image compression of some sort: "Do not worry about long download times for low compression files, our scripts will automatically optimize compression without loss in picture quality.". Indeed some of my images do appear to have smaller file sizes (to be honest I rarely check the size, as I've never had a problem with the 1024kb limit) sometimes 2/3 smaller.

To my eyes, the quality is still there in comparison to the original upload, so how do they do it? Is it just bog-standard jpeg compression? Have any contributors ever noticed quality problems due to it? Just curious.



It takes a big man to admit they are wrong, and I am not a big man.
3 replies: All unread, jump to last
User currently offlineUTA_flyingHIGH From Tunisia, joined Oct 2001, 6495 posts, RR: 48
Reply 1, posted (11 years 5 months 3 weeks 6 days 19 hours ago) and read 5485 times:

It seems like a useful feature as people ripping pics off a.net will not get the same level of quality than the original upload.


Fly to live, live to fly - Air France/KLM Flying Blue Platinum, BMI Diamond Club Gold, Emirates Skywards
User currently offlineChrisH From Sweden, joined Jul 2004, 1136 posts, RR: 14
Reply 2, posted (11 years 5 months 3 weeks 6 days 16 hours ago) and read 5449 times:

The a.net compression has some troubles with strong red colours. Ive uploaded some pics of Sterlings red 737 for instance where on the submitpage I chose not to, cause the sharpness got lost around windows and logos on the body.

Otherwise the algorithm seems top notch.

what seems to be the officer, problem?
User currently offlinePilottim747 From United States of America, joined Jul 2001, 1607 posts, RR: 4
Reply 3, posted (11 years 5 months 3 weeks 4 days 12 hours ago) and read 5363 times:

The scripts usually works fairly good, considering what they do. However, the originals are obviously better quality than the compressed files. It seems that the sharpness of the photo is affected (like ChrisH said).


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