Re: saving jpegs in another format?

Terry <terry@xxxxxxxxxxxxxxxxxxxx> · Fri, 13 May 2005 13:58:07 -0600

And I am sure that works just fine unless like me 
you send your files out to be printed and the photo lab requires you to flatten 
all images, then I believe you do loose information once you flatten that image 
and do away with the layers.
Terry L. Mair
Mair's Photography
158 South 580 East
Midway, Utah 
84049
435-654-3607
www.mairsphotography.com

  ----- Original Message ----- 
  From: 
  herschel 
  mair 
  To: List for Photo/Imaging 
  Educators - Professionals - Students 
  Sent: Friday, May 13, 2005 11:56 AM
  Subject: Re: saving jpegs in another 
  format?

  You don't lose or chamge anything in the original if you use 
  adjustment layers. The original image stays the same and you just change the 
  adjustment layers which you can delete anytime you like. If you use the 
  adjustments directly such as colour balance or hue and saturation then you do 
  lose each time you change. But if you use a colour balance adjustment layer or 
  a hue and sat. adjustment layer, then the changes are independent of the 
  original image. You save all the adjustment layers in a PSD file.

  Herschel

Terry <terry@xxxxxxxxxxxxxxxxxxxx> 
  wrote:

    Hello Herschel
    I think you still loose information each time 
    you adjust a photo file weather you use PS or another photo editing program, 
    and no matter what format you save it to, just by making a simple color 
    change you loose information do this enough and you start to get 
    banding, there is no way around it make enough changes to the same image 
    file and you will loose it, and I don't think layers will help 
    assuming you make the adjustments and flatten the image for 
    printing.
    At lease this is what I have been told in my 
    work flow seminars, and have read in digital photo pro, and rangefinder mag, 
    to name two.

    Personally I am not a fan of jpg, I only shoot 
    jpg when I am taking snapshots and know I will not be making adjustments to 
    them and just want them for memories, every thing else is shot as RAW, and 
    most are saved as RAW, the exception to this are photos that I have worked 
    on to correct color and remove unwanted items and are sold as fine art, 
    those are saved as TIFF files, and I am not advocating TIFF over the other 
    non lossy formats it is just what I am familiar with, once I have my files 
    ready to print ( in the case of portraits ) I do convert to jpg and 
    then FTP them to my printers, tests have shown that once all the 
    changes have been made to a photo file and then converted to 
    jpg it makes no difference in printing, my lab took TIFF files, printed them 
    then converted the files to JPG printed them again in large print sizes and 
    you could not see any difference, but no changes where made to the file 
    once it was converted to JPG.
    Terry L. Mair
Mair's Photography
158 South 580 East
Midway, 
    Utah 84049
435-654-3607
www.mairsphotography.com

      ----- Original Message ----- 
      From: 
      herschel mair 
      To: List for Photo/Imaging 
      Educators - Professionals - Students 
      Sent: Thursday, May 12, 2005 11:27 
      PM
      Subject: Re: saving jpegs in another 
      format?

      Hi again Terry
      The PNG file format is a pretty good one although not all 
      applications support it. If you're using photoshop, the best format to 
      save your working images as is thye photoshop format (.psd) That way you 
      can make adjustment layers, snapshots etc. and keep everything 
      together in case you want to change it later. Disk space is really cheap 
      now and there's no reason to recompress your Jpegs. Most places can print 
      from PSD files too.Tell them bnot to touch anything.

      Herschel

Terry 
      <terry@xxxxxxxxxxxxxxxxxxxx> wrote:

Terry 
        L. Mair
Mair's Photography
158 South 580 East
Midway, Utah 
        84049
435-654-3607
www.mairsphotography.com
----- Original 
        Message ----- 
From: "Andrea Coffey" 
To: 
        "List for Photo/Imaging Educators - Professionals - Students" 

Sent: Thursday, May 12, 2005 
        9:51 PM
Subject: Re: saving jpegs in another format?

> 
        At 22:46 12 05 2005, Sally Mack wrote:
>>When I get my film 
        processed, I order CDs as well as prints. The files on 
>>the 
        CD are jpegs which I then edit. I understand from various sources 

>>that the jpeg format loses data.
>
> That is 
        correct. The extent of loss / how much compression is applied, can 

> be set in many programs. I've found juggling the compression 
        level more or 
> less can find an acceptable compro mise of file 
        size and image output 
> quality. This can often be a long way 
        from the common default of 85% 
> 
        compression.
>
>>Should I save the jpegs as tiffs or some 
        other file format? If so, at 
>>what point should I save in 
        another format, immediately, before editing? 
>>After 
        editing?
>
> Once the image has been loaded into a program, 
        then there are no 
> "accidental" losses of data. It's when the 
        image is _saved_ as a JPG that 
> the losses occur, in the saved 
        file. If you keep editing, the data is 
> still complete (as 
        originally loaded) in the program.

As I understand it each and 
        every time you make an ajustment to an image you 
loose 
        data,
TIFF, PNG, JPG, it doesnt matter, once you make an adjustment 
        you have 
changed information and have
lost information this is 
        why 16 bit is getting popular you only loose half 
or less of 
        the
information as you would loose in 8 bit.
> 
> I find 
        it useful to load the image, and immediately do a "Save As..." with 

> a different name specified, so I don't lose the original image. 
        A useful 
> format for me is PNG, which is not "lossy", so the one 
        file can be 
> repeatedly opened, edited and saved without 
        deterioration. Thus, if I 
> start from a JPG, I'll immediately 
        open it, save as PNG, and then work 
> from there. (Of course, 
        opening the _original_ JPG, which has not been 
> saved 
        over-the-top will still have all the information it ever 
        contained.)
>
> The Pentax Photo Laboratory will only save 
        JPG (five levels of 
> compression) or TIFF (8- or 16-bit), so I 
        save my PEF (Pentax RAW) as 
> TIFF, then open the TIFF in The 
        GIMP, and save as PNG. (Then delete the 
> TIFF, since they are 
        _much_ larger than PNG, with no extra information.) 
> 
        Alternatively, I'll open the PEF in IrfanView Thumbnails and save 
        directly 
> as PNG.
>
>
> &i 
        (:
>
> 

Herschel 
      Mair

H.O.D. Photography Dept, Higher College of Technology
Al 
      Khuwair
Sultinate of Oman
9899673 

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Herschel 
  Mair

H.O.D. Photography Dept, Higher College of Technology
Al 
  Khuwair
Sultinate of Oman
9899673

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