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Too Much Jpeg Compression?  
User currently offlineLinco22 From United Kingdom, joined Jun 2005, 1375 posts, RR: 20
Posted (6 years 3 months 1 week 5 days 1 hour ago) and read 1084 times:

Hi all,

I have this one in the que. Problem on upload was that at minumum/maximum compression(ie set at 12) the file size was 1043kb. I knocked it down to 11, which was 650kb. Is there noticeable jpeg compression on this one? I uploaded at 1200x for more detail.

http://www.airliners.net/addphotos/b...ready/bmia321midhatbhd29106_03.jpg

Regards
Colin  Smile

12 replies: All unread, jump to last
 
User currently offlineSean377 From United Kingdom, joined Mar 2001, 1225 posts, RR: 51
Reply 1, posted (6 years 3 months 1 week 5 days 1 hour ago) and read 1074 times:

The quality looks ok to me. Can you see a visible difference between this and the larger file?

I tend to save at a setting of 10, the smaller of the maximum settings.

Sean


Flying is the second greatest thrill known to man... Landing is the first!
User currently offlineLinco22 From United Kingdom, joined Jun 2005, 1375 posts, RR: 20
Reply 2, posted (6 years 3 months 1 week 5 days 1 hour ago) and read 1069 times:

Not to my eye, but my eyes arent experienced enough to see those things just yet!

Thanks Sean

User currently offlineSean377 From United Kingdom, joined Mar 2001, 1225 posts, RR: 51
Reply 3, posted (6 years 3 months 1 week 5 days 1 hour ago) and read 1063 times:

Quoting Linco22 (Reply 2):
but my eyes arent experienced enough to see those things just yet!

Ah! Well if that's your criteria, then I would take my advice with a pinch of salt too!


Flying is the second greatest thrill known to man... Landing is the first!
User currently offlineDLX737200 From United States of America, joined May 2001, 1781 posts, RR: 27
Reply 4, posted (6 years 3 months 1 week 5 days 1 hour ago) and read 1054 times:

Hey! It looks great. A little unlevel but no jpeg compression that I can see.

-Justin


The public: They always know better, even though they often know nothing
User currently offlinePsych From United Kingdom, joined Nov 2004, 2909 posts, RR: 63
Reply 5, posted (6 years 3 months 1 week 5 days ago) and read 1042 times:		 Support Airliners.net - become a First Class Member!

Hello Colin - keeping well I hope.

I am intrigued that this photo was over 1 MB at 12. I have never had that experience myself, and I always make sure that I save at the highest quality setting. Do you know what caused that?

I agree that there doesn't seem to be a significant jpeg compression issue. But I do think the aircraft could possibly be a bit sharper (might be helped by having the edit at 1024 size), and I would say from an eyeball of the photo that there is a need for some CW rotation too - too many of those background verticals are leaning to the left.

Take good care.

Paul

User currently offlinePtrjong From Netherlands, joined Mar 2005, 3518 posts, RR: 23
Reply 6, posted (6 years 3 months 1 week 4 days 22 hours ago) and read 1022 times:

Hi Linco, Paul and all,

Quoting Psych (Reply 5):
I am intrigued that this photo was over 1 MB at 12. I have never had that experience myself,

This does happen to me occasionally. I believe this pic was one occasion:

View Large View Medium
Click here for bigger photo!
Photo © Peter de Jong


Somewhat complicated backgrounds do the trick I suppose. I think saving these pics at 11 doesn't hurt too much. But I wouldn't do it as standard Sean!

Peter


The only difference between me and a madman is that I am not mad (Salvador Dali)
User currently offlineTom3 From Luxembourg, joined Apr 2004, 228 posts, RR: 2
Reply 7, posted (6 years 3 months 1 week 4 days 22 hours ago) and read 1020 times:

Hello

When I save my pictures at 1200x , they always pass the 1MB mark , so it's better to resize to 1024x , so you can save at max. 12 !

But I don't see a big loss in quality when you save at 11 !

Cheers

Tom


Tom Mousel - Lap
User currently offlineAdministrator From Sweden, joined May 1999, 3251 posts.
Reply 8, posted (6 years 3 months 1 week 4 days 20 hours ago) and read 1007 times:		 AIRLINERS.NET CREW
SITE ADMIN

I must admit I don't see much of that jpeg compression problem. Maybe the screener mistook the exhaust behind the engines or the blurry upper parts of the background as a jpeg compression issue. In any case, the shot is good but not fantastic. If this is an aircraft that we have lots of photos of already in the database, you'll see that our requirements are pretty high and this one might not make it as it does not, in my view, have that little extra.

Regards,
Johan


Working on the site from morning 'till night that's livin' alright (1997-2007)
User currently offlineQ330 From Australia, joined Dec 2003, 1460 posts, RR: 29
Reply 9, posted (6 years 3 months 1 week 4 days 15 hours ago) and read 975 times:

The addtional jpeg compression from saving at quality 11 is almost imperceptible. I always try to save at quality 12, but I don't mind using 11 if needed, since the quality is hardly affected. Of course, as Johan said, the quality of this shot isn't that high. I think you'd be better off keeping it at 1024 px. wide and then you wouldn't have to worry about saving at quality 11 anyway.

-Q


Long live the A330!
User currently offlineLinco22 From United Kingdom, joined Jun 2005, 1375 posts, RR: 20
Reply 10, posted (6 years 3 months 1 week 4 days 10 hours ago) and read 960 times:

Morning folks,

Thanks for the responses to all, Paul, Q and Johan(Keeping well Paul, hope you are too. PLanning MAN on May day this year as I type this). Privilaged to have Johan reply to my thread I must say! I guess the shot will be pulled and a rework at 1024x. Thanks again all.

Regards
Colin  Smile

User currently offlineLinco22 From United Kingdom, joined Jun 2005, 1375 posts, RR: 20
Reply 11, posted (6 years 3 months 1 week 4 days 4 hours ago) and read 941 times:

Paul,

Can I send you the file to see how you get on with it?

Regards
Colin  Smile

User currently offlinePsych From United Kingdom, joined Nov 2004, 2909 posts, RR: 63
Reply 12, posted (6 years 3 months 1 week 4 days 3 hours ago) and read 931 times:		 Support Airliners.net - become a First Class Member!

Hi Colin.

You are very welcome to send along the original and I will see what I come up with.

Take good care.

Paul
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