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Jpeg Compression Question  
User currently offlineAIRBUSRIDER From United States of America, joined Nov 2004, 208 posts, RR: 1
Posted (8 years 8 months 1 week 6 days 21 hours ago) and read 2372 times:

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


No Officer, I am not a Terrorist !
22 replies: All unread, jump to last
 
User currently offlineChristeljs From United Kingdom, joined Jun 2005, 533 posts, RR: 4
Reply 1, posted (8 years 8 months 1 week 6 days 20 hours ago) and read 2371 times:

Put the compression to 10. That's what I do. And I just Save it.


Christel Sinsen Photography
User currently offlineViv From Ireland, joined May 2005, 3142 posts, RR: 28
Reply 2, posted (8 years 8 months 1 week 6 days 20 hours ago) and read 2365 times:

"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
User currently offlineZSOFN From United Kingdom, joined Jun 2005, 1413 posts, RR: 5
Reply 3, posted (8 years 8 months 1 week 6 days 20 hours ago) and read 2357 times:

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 )


User currently offlineViv From Ireland, joined May 2005, 3142 posts, RR: 28
Reply 4, posted (8 years 8 months 1 week 6 days 20 hours ago) and read 2357 times:

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
User currently offlineWillo From United Kingdom, joined Dec 2003, 1352 posts, RR: 12
Reply 5, posted (8 years 8 months 1 week 6 days 20 hours ago) and read 2351 times:

Viv is right, you should be using "save as" not "save for web".

User currently offlineAIRBUSRIDER From United States of America, joined Nov 2004, 208 posts, RR: 1
Reply 6, posted (8 years 8 months 1 week 6 days 20 hours ago) and read 2351 times:

I am guilty of selective sharpening but did not use neatimage. How would I save in photoshop?


No Officer, I am not a Terrorist !
User currently offlineViv From Ireland, joined May 2005, 3142 posts, RR: 28
Reply 7, posted (8 years 8 months 1 week 6 days 20 hours ago) and read 2349 times:

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
User currently offlineAIRBUSRIDER From United States of America, joined Nov 2004, 208 posts, RR: 1
Reply 8, posted (8 years 8 months 1 week 6 days 20 hours ago) and read 2343 times:

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???


No Officer, I am not a Terrorist !
User currently offlineIL76 From Netherlands, joined Jan 2004, 2239 posts, RR: 48
Reply 9, posted (8 years 8 months 1 week 6 days 19 hours ago) and read 2342 times:

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

E


User currently offlineAIRBUSRIDER From United States of America, joined Nov 2004, 208 posts, RR: 1
Reply 10, posted (8 years 8 months 1 week 6 days 19 hours ago) and read 2339 times:

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?


No Officer, I am not a Terrorist !
User currently offlineZSOFN From United Kingdom, joined Jun 2005, 1413 posts, RR: 5
Reply 11, posted (8 years 8 months 1 week 6 days 19 hours ago) and read 2337 times:

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

Oops! Crossed wires...


User currently offlineIL76 From Netherlands, joined Jan 2004, 2239 posts, RR: 48
Reply 12, posted (8 years 8 months 1 week 6 days 19 hours ago) and read 2333 times:

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


User currently offlineAIRBUSRIDER From United States of America, joined Nov 2004, 208 posts, RR: 1
Reply 13, posted (8 years 8 months 1 week 6 days 19 hours ago) and read 2330 times:

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

IL76, here is the original from the camera



No Officer, I am not a Terrorist !
User currently offlineIL76 From Netherlands, joined Jan 2004, 2239 posts, RR: 48
Reply 14, posted (8 years 8 months 1 week 6 days 19 hours ago) and read 2326 times:

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]

User currently offlineAIRBUSRIDER From United States of America, joined Nov 2004, 208 posts, RR: 1
Reply 15, posted (8 years 8 months 1 week 6 days 18 hours ago) and read 2317 times:

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


No Officer, I am not a Terrorist !
User currently offlineAIRBUSRIDER From United States of America, joined Nov 2004, 208 posts, RR: 1
Reply 16, posted (8 years 8 months 1 week 6 days 17 hours ago) and read 2300 times:

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


OK, I tried as best I could to follow Ed's guidlines..........is this an improvement?



No Officer, I am not a Terrorist !
User currently offlineViv From Ireland, joined May 2005, 3142 posts, RR: 28
Reply 17, posted (8 years 8 months 1 week 6 days 15 hours ago) and read 2285 times:

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
User currently offlinePhilhyde From United States of America, joined Aug 2003, 678 posts, RR: 1
Reply 18, posted (8 years 8 months 1 week 6 days 15 hours ago) and read 2278 times:

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



HoustonSpotters Admin - Canon junkie - Aviation Nut
User currently offlineZSOFN From United Kingdom, joined Jun 2005, 1413 posts, RR: 5
Reply 19, posted (8 years 8 months 1 week 6 days 15 hours ago) and read 2273 times:

Unfortunately there are still a lot of jaggies, particularly on the tail and along the top of the fuselage.

User currently offlineAIRBUSRIDER From United States of America, joined Nov 2004, 208 posts, RR: 1
Reply 20, posted (8 years 8 months 1 week 6 days 14 hours ago) and read 2260 times:

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....


No Officer, I am not a Terrorist !
User currently offlinePhilhyde From United States of America, joined Aug 2003, 678 posts, RR: 1
Reply 21, posted (8 years 8 months 1 week 6 days 14 hours ago) and read 2257 times:

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

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

cheers,
Phil



HoustonSpotters Admin - Canon junkie - Aviation Nut
User currently offlineAIRBUSRIDER From United States of America, joined Nov 2004, 208 posts, RR: 1
Reply 22, posted (8 years 8 months 1 week 6 days 14 hours ago) and read 2249 times:

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


No Officer, I am not a Terrorist !
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