AIRBUSRIDER
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Posts: 203
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Jpeg Compression Question

Tue Apr 18, 2006 11:01 pm

Hi all, I recently got a rejection for "too much JPEG compression" and it has me puzzled. I am shooting in "Jpeg Large Fine" with my 30D and when I start working on a photo, I have been using the "Save for web" and "Jpeg maximum" in PS7. I have never had a problem with this before and was wondering if anyone can tell me if there is a better way or if I have been doing it wrong all along.


http://www.airliners.net/uf/view.fil...6629&filename=11453685576Bidvj.jpg
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christeljs
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RE: Jpeg Compression Question

Tue Apr 18, 2006 11:03 pm

Put the compression to 10. That's what I do. And I just Save it.
Christel A Photography
 
viv
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RE: Jpeg Compression Question

Tue Apr 18, 2006 11:15 pm

"Save for web" is your problem.

Save in Photoshop using the largest file size (12).
Nikon D700, Nikkor 80-400, Fuji X Pro 1, Fujinon 35 f/1.4, Fujinon 18 f/2
 
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ZSOFN
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RE: Jpeg Compression Question

Tue Apr 18, 2006 11:30 pm

I don't actually see much of a compression issue personally, more of a softness issue. Did you use neatimage or try to do selective sharpening on the aircraft? It looks like the edge around the aircraft is a bit blurred in comparison to everything else. Also there's quite a lot of noise around the underside of the engines and the wingbox area.

Quoting Viv (Reply 2):
"Save for web" is your problem.

Save in Photoshop using the largest file size (12).

Seems he doesn't have Photoshop. (It's not cheap!  Smile )
 
viv
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RE: Jpeg Compression Question

Tue Apr 18, 2006 11:31 pm

Quoting ZSOFN (Reply 3):
Seems he doesn't have Photoshop

He mentions that he has PS7 ...
Nikon D700, Nikkor 80-400, Fuji X Pro 1, Fujinon 35 f/1.4, Fujinon 18 f/2
 
willo
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RE: Jpeg Compression Question

Tue Apr 18, 2006 11:38 pm

Viv is right, you should be using "save as" not "save for web".
 
AIRBUSRIDER
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RE: Jpeg Compression Question

Tue Apr 18, 2006 11:38 pm

I am guilty of selective sharpening but did not use neatimage. How would I save in photoshop?
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viv
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RE: Jpeg Compression Question

Tue Apr 18, 2006 11:44 pm

Quoting AIRBUSRIDER (Reply 6):
How would I save in photoshop?

Click on "Save as". Give the file a name. Make sure the Size slider is at 12. Click Save.
Nikon D700, Nikkor 80-400, Fuji X Pro 1, Fujinon 35 f/1.4, Fujinon 18 f/2
 
AIRBUSRIDER
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RE: Jpeg Compression Question

Tue Apr 18, 2006 11:59 pm

viv, once I "save as", do my work on the photo, just as an easier way to send it to anet, I usually send it to my "desktop" from photoshop. Am I compressing it again by sending it to desktop? Is that hurting the quality???
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IL76
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RE: Jpeg Compression Question

Wed Apr 19, 2006 12:03 am

Sometimes the wrong sharpening technique can leave artifacts that resemble JPG-compression.

E
 
AIRBUSRIDER
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RE: Jpeg Compression Question

Wed Apr 19, 2006 12:09 am

You know IL76, I was thinking the same thing because I have never had a problem with compression before. You may have even screened some of my shots in the past. Do you have any suggestions on sharpening that might work better for me?
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ZSOFN
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RE: Jpeg Compression Question

Wed Apr 19, 2006 12:13 am

Quoting Viv (Reply 4):
He mentions that he has PS7 ...

Oops! Crossed wires...
 
IL76
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RE: Jpeg Compression Question

Wed Apr 19, 2006 12:19 am

Anthony,
The example you posted has some weird things going on regarding shapening (no pun intended). Is it possible for you to post a full sized part (like the cockpit section) of the original shot? (our profiles now allow pictures to be uploaded). I can have a go for you...
Eduard
 
AIRBUSRIDER
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RE: Jpeg Compression Question

Wed Apr 19, 2006 12:29 am

http://www.airliners.net/uf/536886629/1145374053b2Wdoc.jpg

IL76, here is the original from the camera
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IL76
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RE: Jpeg Compression Question

Wed Apr 19, 2006 12:57 am

Have to agree, it's a tough one... Those little titles on the engine are hard to get sharp, if not impossible (at 1000x).

What I did:
- Crop
- Levels (a bit brighter)
- Shadow-Highlight on the shadows (+10, radius 0)
- Resize
- Duplicate layer
- Select the sky with the magic wand at treshold 15 and invert the selection.
- Expand the selection with 1 pixel, then 1 pass of USM 200, 0.2, 0
- Again expand the selection with 1 pixel, then 1 pass of USM 200, 0.2, 0
- rub out jaggies with the eraser.
- flatten image and save.

Ok, it was a rushjob, but you can see the difference best on the "Luis F. Kahl", the registation, the "Embraer 190" and the tail.



I hope it makes sense. Perhaps someone else can do a better job.

E

[Edited 2006-04-18 18:06:53]
 
AIRBUSRIDER
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RE: Jpeg Compression Question

Wed Apr 19, 2006 1:07 am

Ed, I have to say that is a major improvement! I always have a hard time with Jetblue. I will try exactly what you did and try to get it right but I must say a big THANK YOU for your time on explaining this and for the example. I think one of my mistakes is that I resize it first and then work on it. I also do not really get the duplicate layering thing but all in all I did learn a lot today from you. Thanks again and if you see this shot come your way while screening, have mercy !!! (lol) Thanks again, Anthony
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AIRBUSRIDER
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RE: Jpeg Compression Question

Wed Apr 19, 2006 2:11 am

http://www.airliners.net/uf/536886629/1145380137nDmj2F.jpg


OK, I tried as best I could to follow Ed's guidlines..........is this an improvement?
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viv
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RE: Jpeg Compression Question

Wed Apr 19, 2006 4:16 am

Quoting AIRBUSRIDER (Reply 8):
once I "save as", do my work on the photo, just as an easier way to send it to anet, I usually send it to my "desktop" from photoshop. Am I compressing it again by sending it to desktop? Is that hurting the quality???

No, I don't think so. But I save in a sub-folder of "My Photos".
Nikon D700, Nikkor 80-400, Fuji X Pro 1, Fujinon 35 f/1.4, Fujinon 18 f/2
 
philhyde
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RE: Jpeg Compression Question

Wed Apr 19, 2006 4:32 am

Quoting AIRBUSRIDER (Reply 16):
OK, I tried as best I could to follow Ed's guidlines..........is this an improvement?

It seems slightly un-centered on the horizontal to me. If you are going to crop tight with the stablizer on the arse end (which I do) then you should duplicate that spacing on the nose.

cheers,
Phil
Canon junkie - Aviation Nut
 
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ZSOFN
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RE: Jpeg Compression Question

Wed Apr 19, 2006 4:41 am

Unfortunately there are still a lot of jaggies, particularly on the tail and along the top of the fuselage.
 
AIRBUSRIDER
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RE: Jpeg Compression Question

Wed Apr 19, 2006 5:12 am

Yup, I see those damn jaggies.........can someone tell me how to rub out jaggies using the eraser? IL76 (Ed) mentioned how to do it but I can not figure it out. Also, I noticed the crop error Phil, I will probably re-do the whole shot (or scrap it I am so tired of looking at it) it was just sort of a practice using some of the techniques I am learning from this thread. I am using PS7....
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philhyde
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RE: Jpeg Compression Question

Wed Apr 19, 2006 5:17 am

Anthony, this workflow is pretty useful for learning the layered sharpening.

http://www.airliners.net/addphotos/PsProc.pdf

cheers,
Phil
Canon junkie - Aviation Nut
 
AIRBUSRIDER
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RE: Jpeg Compression Question

Wed Apr 19, 2006 5:40 am

Thanks Phil, I will work with that. I am imagining it is ok for PS7??
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