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Too Much Compression After Upload?  
User currently offlineAviationIvi From Germany, joined Feb 2001, 777 posts, RR: 7
Posted (12 years 10 months 3 weeks 6 days 19 hours ago) and read 2652 times:

Hello there,
can anyone tell me why all pics are going to be compressed so much after upload?
Sure, to get a better file size, but isn´t it too much?
I uploaded this pic a few secs ago with no compression (was 1,11 MB big) and now it looks a little bit too much compressed after upload. What do you guys think?
Here my pic:
http://www.airliners.net/addphotos/big/0044ba737.jpg
Thanks for your help!
Regards,
Ivica


9 replies: All unread, jump to last
 
User currently offlineJderden777 From United States of America, joined Jan 2000, 1754 posts, RR: 30
Reply 1, posted (12 years 10 months 3 weeks 6 days 19 hours ago) and read 2550 times:

Nice shot! I'm not sure about compression, but I think it does look a bit soft..maybe try sharpening just a little..
btw, Where was that taken?



"my soul is in the sky" - shakespeare
User currently offlineAviationIvi From Germany, joined Feb 2001, 777 posts, RR: 7
Reply 2, posted (12 years 10 months 3 weeks 6 days 19 hours ago) and read 2549 times:

It was taken in Frankfurt on a nice winter evening. The a/c was parking at Terminal 2.
Thanks for your reply!
Regards
Ivica
btw: I did not want to sharpen it too much. I think it´s okay so.


User currently offlineHawaiian717 From United States of America, joined May 1999, 3176 posts, RR: 8
Reply 3, posted (12 years 10 months 3 weeks 6 days 18 hours ago) and read 2540 times:

I don't see any of the signs of too much JPEG compression in that photo. What you want to look for is odd dots around abrupt color changes. If you have any text added to the photo (like a copyright notice) often that will be vulnerable.

The way the JPEG file format works, the compression algorithm is applied every time time file is saved. So after Airliners.net adds the black bar at the bottom with your name and copyright and the site name, the file gets recompressed when it is saved. So to provide the best source image, using the minimum amount of compression your photo editing software allows will help.

Also for this reason, if you make several saves as you are editing the photo, you compound the problem. This is why you want to save your file in another format (TIFF, .tif, works well) until you are happy with it and ready to upload, then save a copy as JPEG. TIFF takes up a lot of disk space (which is why it is not used much on the Internet) so once you have the photo online and you're happy with everything you might want to delete it unless you have lots of disk space to spare. Archiving the TIFF files on a CD-R or similar large, inexpensive storage device is another alternative.

David / SAN


User currently offlinePUnmuth@VIE From Austria, joined Aug 2000, 4162 posts, RR: 54
Reply 4, posted (12 years 10 months 3 weeks 6 days 9 hours ago) and read 2524 times:

Hi+
I think the pics aren't compressed or altered anyway as long as they are stored at the .../addphotos/big directory at the airliners.net server. Just open the image and then click the right mouse button and view the properties of the file. You'll see that the size is still 1.1. MB which is exactly the size you are writing about in your first posting. So I think theres no difference between your pic and the one stored temporary at the addphotos directory.
Peter



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User currently offlineAviationIvi From Germany, joined Feb 2001, 777 posts, RR: 7
Reply 5, posted (12 years 10 months 3 weeks 6 days 8 hours ago) and read 2514 times:

Thanks for your replies!

Hawaiian717: I use jpg-Wizard and save my pics with almost no compression before I upload them. That´s all. Anyway, thanks for your help!

Peter: No, all pics are going to be compressed after upload. They do not keep their original size. This pic had more than 1MB! (I started uploading pics uncompressed because I saw the big difference in quality), and now it has a size of 34KB.
You will find it out too by checking your file size of your pics in the queue and comparing it with your "originals".

Any thoughts?
Regards,
Ivica


User currently offlinePUnmuth@VIE From Austria, joined Aug 2000, 4162 posts, RR: 54
Reply 6, posted (12 years 10 months 3 weeks 6 days 8 hours ago) and read 2514 times:

How do you get the size of 34KB? The properties are displaying the following
URL: http://www.airliners.net/addphotos/big/0044ba737.jpg
Size: 1167608 Byte
Dimensions: 1024 * 761 pixel
Are you shure that 34 KB isn't the size of the small one?
Anyway
Peter



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User currently offlineAviationIvi From Germany, joined Feb 2001, 777 posts, RR: 7
Reply 7, posted (12 years 10 months 3 weeks 6 days 8 hours ago) and read 2515 times:

Hello Peter, thanks again for your help. I don´t know why we get different properties. When I open this pic: http://www.airliners.net/addphotos/big/0044ba737.jpg
and view the properties by clicking the right mouse button it shows me 33959Bytes????? and I don´t know why it is compressed so much when you say that there is no compression as long as they "stay" there??

Gary, do you know?
Thanks,
Ivica


User currently offlineHawaiian717 From United States of America, joined May 1999, 3176 posts, RR: 8
Reply 8, posted (12 years 10 months 3 weeks 6 days 6 hours ago) and read 2508 times:

Ivica, I just checked the file, and its showing as over 1MB in my web browser, OmniWeb 4.0 for Mac OS X. Here's a screen shot:



Incidentally, this shows a good example of the degradation of text with too much JPEG compression. These kinds of problems are hard to see with photos (which is why the JPEG format is used for them), but they show up a lot in computer graphics which have large continuous areas of the same color. Which is why the GIF and PNG formats are preferred for graphics.

David / SAN


User currently offlineAviationIvi From Germany, joined Feb 2001, 777 posts, RR: 7
Reply 9, posted (12 years 10 months 3 weeks 4 days 21 hours ago) and read 2487 times:

Thank you very much David!
Regards,
Ivica


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