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|| SportsShooter.com: Member Message Board
Question about Jpgging...
Jack Howard, Photographer
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Somerville | NJ | USA | Posted: 2:23 PM on 11.20.04 |
->> I'm not sure if this is a silly question, but I cannot find a definitive answer anywhere.
If you have an image saved as a jpg and then update/change/modify the file info and resave the image, does PS resample/recompress/degrade the image again?
In other words, all I did was alter the XMP/IPTC fields, but did no further modifications to the actual pixels between saves (CMD+S save method), and I'm just curious if anyone knows for certain if or if not the image is recompressed/degraded when doing this?
Thanks! |
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Gary Lake, Photographer
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Morgantown | WV | USA | Posted: 2:26 PM on 11.20.04 |
| ->> Yes. Unfortunately, every time you resave a jpeg file it is degraded. |
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Nathan Simpson, Photographer, Student/Intern
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Santa Barbara | CA | USA | Posted: 2:47 PM on 11.20.04 |
| ->> Gary is right. To run a test grab a small jpg a couple hundred pixels wide set compression to low set up an action in ps and open, save and close it a hundred times. You will see. I always shoot raw and save psd to keep max image quality. but on the other hand I have to have several hundred gigs of hard drives |
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Elisha Page, Photographer, Student/Intern
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Athens | OH | USA | Posted: 2:48 PM on 11.20.04 |
| ->> How about if you add or change IPTC info with Photo Mechanic? Are you really resaving the image or just adding the file info? |
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Gary Lake, Photographer
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Morgantown | WV | USA | Posted: 4:29 PM on 11.20.04 |
| ->> As member Joe Rodriguez just pointed out to me, the best option for editing the data fields in a jpeg image is indeed a program like Photomechanic which allows you to add/modify data without having to actually resave/recompress the image. |
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Elisha Page, Photographer, Student/Intern
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Athens | OH | USA | Posted: 5:45 PM on 11.20.04 |
->> Thank you all for you responses. As I suspected photomechanic does not recompress the image.
Kirk Baker from Camera Bits just emailed me:
"Photo Mechanic does not resave the JPEG in order to caption it. The image quality is not degraded whatsoever." |
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Guy Rhodes, Student/Intern, Photographer
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East Chicago | IN | USA | Posted: 3:47 AM on 11.21.04 |
| ->> In Photoshop CS, if you use the file browser and open an image's file info box WITHOUT opening the image itself, you can modify the file info, close it out, and the changes stay, without ever having to pull down FILE --> SAVE. I'm not sure if this method still recompresses the file somehow, but I haven't noticed any degredation in quality when doing this. |
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Henry Hsu, Student/Intern, Photographer
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Arcadia | CA | USA | Posted: 6:29 AM on 11.21.04 |
->> What if you shoot in JPEG, then convert it to Tiff or PSD for editing?
A lab-tech at my school name David who shot professionally recommanded that I shoot in Tiff to get the best detail in shadows and highlights, but I simply can't do that with my D100. Slow processing and all. |
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Matt Barton, Photographer
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Lexington | KY | USA | Posted: 1:42 PM on 11.21.04 |
->> Henry, your tech is correct if he meant to shoot raw and then convert a JPEG file later. That's what I do for non-deadline stuff.
But it's very counter-productive to take a JPEG and re-save it as a TIF. Basically you still have the JPEG noise and crappyness with the added bonus of a giant file size. Pointless and it will get you no ladies. |
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Leslie Billman, Photographer
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Annapolis | Md | USA | Posted: 9:22 PM on 11.21.04 |
| ->> Matt: so what do you do with deadline stuff? |
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Henry Hsu, Student/Intern, Photographer
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Arcadia | CA | USA | Posted: 2:35 AM on 11.22.04 |
| ->> i don't think I can make the conversion to shooting raw, my D100 is too slow to handle that properly. |
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