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Export and File Size Limit Problem

May 3, 2012 3:42 PM

Tags: #file #size #export #limit

Hi there,

im currently using LR 4.0 and found a problem with file export, I dont understand.

 

I have two tiff files:

Tiff 1: 283MB, full resolution ( 2336 x 3504 )

Tiff 2: 233MB, full resolution ( 2336 x 3504 )

 

Export witht: 574 x 1000 image width

JPG 1: 168kb

JPG 2: 194kb

Both jpegs have 600px x 887px (fram with mogrify plugin#) and 100%jpg quality.

 

Whe I set a limit to file size of 154kb, I receive following:

JPG 1: 102kb

JPG 2: with error ( couldn't create jpg which fit's the file size limit of 154kb )

 

But why?

If I export the second tiff manually with 90% jpg quality and no filesize, I get:

JPG 1: 114kb

JPG 2: 135kb

 

So it seems that the "limit file size" isn't really working.

Anyone have seen this?

 

Also it seems that Valus between 92 and 100 ends in: same as 100.

Why?

 

Jörg

 
Replies
  • Currently Being Moderated
    May 3, 2012 4:09 PM   in reply to Joerg.Lang

    Why? Since the programmer at Adobe probably isn't going to pop in here and explain, we will probably never know.

     

    Quality levels between 92 and 100 probably are the same. There really aren't 101 different quality levels, there are probably only 13 distinct quality levels.

     
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  • Currently Being Moderated
    May 3, 2012 5:25 PM   in reply to Joerg.Lang

    I had major problems using file-size limiter when I tried it (a good while ago, probably Lr3)

     

    Inexplicable results, and worse - inexplicable errors.

     

    Perhaps some people have had better experiences with it?

     

    Rob

     
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  • Currently Being Moderated
    May 4, 2012 2:28 AM   in reply to Joerg.Lang

    that´s old news.

     

    http://regex.info/blog/lightroom-goodies/jpeg-quality

     

     

     

    Conclusions

    First of all, you can't directly compare Lightroom's JPEG quality settings with any other application. The settings may well map directly to Photoshop's save-as-JPEG 0〜12scale, and they may well partially map to Photoshop's “Save for the Web” settings, but all bets are off when it comes to the JPEG quality setting on non-Adobe applications. They're just totally unrelated to how Adobe does it. (I should make it clear that the difference is neither good nor bad; I've presented nothing here about how any other application creates JPEGs, so there are no conclusions to draw about which might be better or worse than Lightroom; the important point is to recognize that the scales, even if sharing the same “0〜100”labels, are absolutely completely unrelated.)

    The Lightroom default JPEG export quality of 75, falling in the 70〜76range, seems to provide for as good a visible result as the highest quality setting for all the samples except for the bridge, which seems to suffer at least slight posterization banding at all levels, including even“lossless TIFF”. The file size, even at this relatively high 70〜76setting, is still about one third that of the 93〜100setting, so is well worth it in most situations. Those who blindly use the maximum setting for their exports likely waste a lot of local disk space, upload bandwidth, and remote storage space. But conversely, those who blindly use some lesser setting risk posterization in the occasional photo with an unlucky sky gradient.

     
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  • Currently Being Moderated
    May 4, 2012 2:33 AM   in reply to Joerg.Lang

    yep possible you encountered a bug with the 100% setting.

     
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  • Currently Being Moderated
    May 15, 2012 6:36 PM   in reply to Joerg.Lang

    Agreed that the file size limitation in both LR3 and LR4 simply does not work, giving significantly lower file sizes than what is input within the export dialogue box. Use the save for web command within PS if you need to limit file size.

     
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