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forehand1
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file size changes in multiple file process

Mar 4, 2013 8:28 AM

how can in reatin my original jpg file sizes when processing multiple file in 11 using expert mode.  i am a new user.

 
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    Mar 4, 2013 8:54 AM   in reply to forehand1

    You can't. There's no reason to expect JPG file sizes will remaing the same when you are processing them. JPG is a compression method, and when you save a JPG, it gets compressed according to the algorithm, thus changing the file size. So the idea of obtaining the same (or even similar) file size after such a processing operation is one you should discard.

     
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    Mar 4, 2013 1:50 PM   in reply to dj_paige

    If you want to maintain file size change the file to a tif or psd.

     
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    Mar 4, 2013 2:50 PM   in reply to swharton07

    TIF or PSD file size would be much larger than the file size of a JPG, not the same file size

     
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    Mar 4, 2013 4:34 PM   in reply to dj_paige

    Are we talking about loss of resolution or number of bytes? If you don't want to lose resolution you need to create the pic as a tif or psd. Each time you save a jpg(being a lossy format) the resolution decreases as does the file size.

     
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    Mar 4, 2013 4:46 PM   in reply to swharton07

    The original question dealt with file size. You seem to be changing the question to resolution or number of bytes.

     

    Each time you save a jpg(being a lossy format) the resolution decreases as does the file size.

    Saving a JPG keeps the exact same resolution and the exact same number of bytes.

     

    Furthermore, you can save a JPG at a high quality level (like 10 11 or 12) and get a LARGER file size.

     
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    Mar 5, 2013 1:15 AM   in reply to dj_paige

    Do an experiment on a jpg picture. Note the size of the original, do a nominal change and save it again and  you will see a loss in size which affects resolution. I saved a jpg 4 times and it started at 8.4M, ended up at 6M, at a 12. I stand by JPG is a lossy format and affects resolution.

     
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    Mar 5, 2013 3:53 AM   in reply to swharton07

    It does not affect resolution. You are not using the word properly. The number of pixels remains the same. The resolution remains the same. The file size decreases. File size and resolution are not the same.

     

    If the photo was 3000x2000 pixels, and 300ppi, and you perform your experiment, the final photo is still 3000x2000 at 300ppi, the resolution and number of pixels has not changed.

     
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    Mar 5, 2013 8:14 AM   in reply to dj_paige

    We are both right in our own ways. I was wrong on resolution but if you do too many saves as a jpg it starts affecting the picture quality. The original question was regarding file size(which I interpret to mean physical file size) and you can only maintain the file size if you convert to a tif or psd, yes it will be a larger file but when converted back to jpg the file size would probably be close to the original.

     
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    Mar 5, 2013 8:45 AM   in reply to swharton07

    if you do too many saves as a jpg it starts affecting the picture quality

    Which was never a point of debate here

     

    you can only maintain the file size if you convert to a tif or psd, yes it will be a larger file but when converted back to jpg the file size would probably be close to the original

    A totally pointless thing to do; and furthermore I dispute your statement that it would "probably be close to the original" as the files size when converting a TIF or PSD to JPG depends on a lot of things, including the quality chosen by the user and the photo content

     

    But I guess we're really going off into the weeds here.

     
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