Saving a JPEG losing as less data as possible.

Discussion in 'Photography Beginners' Forum' started by seagatefree, Mar 21, 2012.

  1. seagatefree

    seagatefree TPF Noob!

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    Hello there! My first post here and I am seeking help.

    - My JPEG photos are shot in 3872x2592, fine mode. Average photo size is 3,80MB
    - Camera is Nikon D80

    I have to edit my photos using Lightroom and photoshop to then upload them on a website as JPEGs; a standard of 300dpi, 8 bit per channel, RGB JPEG files that are at least 15inches/38 cm high (4500) pixels.

    Now how can I save a JPEG after editing series without losing much data and size, admitted that size affects resolution?
    Is saving my jpeg photo as tiff at the end of the first editing so I can perform as many editings I want on the same photo before finally saving as jpeg a good thing to do? Can I forget about tiffs and just save as jpegs while editing?

    I also have to switch to Picnik.com for editing after editing with Lightroom and Photoshop but in Picnik.com I can't work on my tiffs because the website accept only files inferior to 16 MB while mine are an avergae of 28MB so on Picnik.com I can only save as JPEG and I want to do it without losing much data. When i save there as jpeg my photo size drop to an average of 980 kb (original size 3,80mb)
    In the photoshop CS3 "image size" box, I apply 300 to resolution, 4500 to height, keep "scale Styles","Constrain Proportions","resample Image" checked and select "bicubic(best for smooth gradients)", When I save as jpg there the size increases to an average of 4,30 MB but I wonder how much data was lost in all the editing processes and if my photo would still be good for large prints.

    Thank you very much for your assistance!!!


     
  2. MReid

    MReid TPF Noob!

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    Yes, do the first save to tiff then you can edit and resave as many times as necessary as tiffs.
    When you are finished editing save as jpeg.

    Full size jpegs start to become visibly degraded after only 2 or 3 saves.

    Why do you have to switch to Picnik, that doesn't make any sense if you have Lightroom and Photoshop.
     
  3. Joey_Ricard

    Joey_Ricard TPF Noob!

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    OK you wrote so much up there I am spending time trying to figure out what you are trying to do, what picnic has to do with this I dont understand.
    going on what I think you are asking.



    1) if you have photoshop and are not finished with the image you should be saving to PSD file to be worked on later (or keep as master), you should only convert to jpg or should I say back to jpg when you are ready for final output

    .
    in LAYMANS terms here and just generalizing, although someone will come along and provide the key to the exact molecular structure of the carbon atom in an attempt to help you out or confuse you...

    2) if your dimensions of original jpg are 3872x2592 this would be about 51" x 24" at say 75 ppi monitor view, converted to 300dpi you'd end up with something like 12.9 x 8.5 or something close (not using calculator here) - in photoshop, resample up until you get either the size or pix dimensions that you require.

    but whatever, if working in photoshop, you should be saving your photoshop work to PSD file for later use.
     
  4. Village Idiot

    Village Idiot No longer a newbie, moving up!

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  5. KmH

    KmH In memoriam Supporting Member

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    Some of the information in that link is wrong.

    The conversion to JPEG greatly reduces the anount of color data, but leaves the luminosity data intact.

     
    Last edited: Mar 21, 2012
  6. The_Traveler

    The_Traveler Completely Counter-dependent Supporting Member

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    Just out of plain damn curiousity. what kind of work is it that makes you run stuff through PIKNIK (sp?) and then upload large files to a site?
     
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  7. DiskoJoe

    DiskoJoe Been spending a lot of time on here!

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    I was wondering this as well.
     
  8. seagatefree

    seagatefree TPF Noob!

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    Thank you heaps for the answers!
    Well, to answer the curious minds here, I DO wish I could do without picnik.com because it would be one "save as jpeg" less and then save some data but theres' one special effect there I apply to some of my photos that Photoshop and Lightrooms don't provide (or I'd rather say, I'm not good enough with the two softwares to reproduce myself)

    Joey, 'if working in photoshop, you should be saving your photoshop work to PSD file for later use.'. I first work on my photos in Lightroom then switch to photoshop for further editing; so saving as PSD in Lightroom is fine just the same, right?

    Then I bumped into this article. It would be interesting to read what you guys think about it.
    http://www.michaelfurtman.com/jpeg_myths.htm
     
    Last edited: Mar 21, 2012
  9. Joey_Ricard

    Joey_Ricard TPF Noob!

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    Correct, just make sure any layers you have created are saved.
     
  10. seagatefree

    seagatefree TPF Noob!

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    Thanks man, that was precious.
     
  11. MReid

    MReid TPF Noob!

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    I agree with most of the points in the jpeg article. I use jpegs a lot.
    Unless he is doing something I don't.....in my experience multiple over and over saves of a jpeg does degrade it, usually as quickly as after only 2 or 3 saves.

    What is PSD and why do you use it instead of TIFF?
     
  12. Gaerek

    Gaerek No longer a newbie, moving up!

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    PSD is Photoshop's native format. I may be missing something but as far as I know, TIFF format will do everything PSD can do, plus it's compatible with more stuff. Unless there's something I'm missing, you're putting yourself at a disadvantage saving as a PSD.
     

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