AviationIvi
Topic Author
Posts: 760
Joined: Fri Feb 16, 2001 2:49 am

Too Much Compression After Upload?

Thu May 31, 2001 5:28 am

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
 
jderden777
Posts: 1677
Joined: Fri Jan 21, 2000 9:56 am

RE: Too Much Compression After Upload?

Thu May 31, 2001 5:36 am

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
 
AviationIvi
Topic Author
Posts: 760
Joined: Fri Feb 16, 2001 2:49 am

RE: Too Much Compression After Upload?

Thu May 31, 2001 5:40 am

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.
 
hawaiian717
Posts: 3139
Joined: Tue May 18, 1999 2:46 am

RE: Too Much Compression After Upload?

Thu May 31, 2001 6:19 am

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
 
PUnmuth@VIE
Posts: 3119
Joined: Thu Aug 24, 2000 9:31 pm

RE: Too Much Compression After Upload?

Thu May 31, 2001 3:12 pm

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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AviationIvi
Topic Author
Posts: 760
Joined: Fri Feb 16, 2001 2:49 am

RE: Too Much Compression After Upload?

Thu May 31, 2001 4:05 pm

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
 
PUnmuth@VIE
Posts: 3119
Joined: Thu Aug 24, 2000 9:31 pm

RE: Too Much Compression After Upload?

Thu May 31, 2001 4:11 pm

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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AviationIvi
Topic Author
Posts: 760
Joined: Fri Feb 16, 2001 2:49 am

RE: Too Much Compression After Upload?

Thu May 31, 2001 4:40 pm

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
 
hawaiian717
Posts: 3139
Joined: Tue May 18, 1999 2:46 am

RE: Too Much Compression After Upload?

Thu May 31, 2001 5:52 pm

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
 
AviationIvi
Topic Author
Posts: 760
Joined: Fri Feb 16, 2001 2:49 am

RE: Too Much Compression After Upload?

Sat Jun 02, 2001 3:35 am

Thank you very much David!
Regards,
Ivica

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