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peyreoli
Participating Frequently
May 21, 2020
Question

Smart preview dng file exceeding 500 mo size

  • May 21, 2020
  • 5 replies
  • 1758 views

Dear reader, 

I'm seeing in my smart previews folder/package some dng files having exceptional huge size, around 500 mo!!! That gives to the total SP package a size of 200Go 😞 They are smart previews from jpg pictures. Some might be coming from corrupted pictures (one does at least). Most of my other dng files in the smart previews package do not exceed 2 or 3 mo. I  have nearly onnly jpg files and no RAW pictures in my catalog.  

Anyone having the same problem?   Any solution about this to reduce the SP package? 

Thanks

This topic has been closed for replies.

5 replies

P
peyreoliAuthor
Participating Frequently
June 8, 2020

Hello and thanks for all your comments so far. But the question of why do I have dng files of 500mb each has not been really answered. Any idea maybe? 

Zero carbon world tour on bicycle, sailboats and paraglide 2008-2015
dj_paige
dj_paige
Legend
May 22, 2020

Maybe this is a language translation problem or a typo, but I don't know what "500 mo" is.

 

Specifically, I don't know what "mo" is.

    JohanElzenga
    Community Expert
    JohanElzengaCommunity Expert
    Community Expert
    May 22, 2020

    o = b

    -- Johan W. Elzenga
    B
    boomstam
    Participant
    May 25, 2020

    Hi all,

     

    I am researching whether or not it is possible to use smart previews for non-raw pictures as well. There is little information on this, since the smart previews shine on RAW. My catalog consists mostly of RAW images but there are also a substantial number of JPG's and a fair few very large PSD and TIFF's.

     

    What happens with the non-RAW images, are they being processed to DNG as well?  From Peyreoli's posting and kind answers below it seems possible for JPG at least. Love to hear other people's experience on this topic and find out about any considerations to make prior to applying smart-previews to a 75k images catalog 🙂

    GoldingD
    GoldingD
    Legend
    May 21, 2020

    Why would the OP be seeing DNG files in the SmartPreviews folder?

     

    dj_paige
    dj_paige
    Legend
    May 21, 2020

    In Lightroom, you can delete selected (or all) smart previews, but you can't really change the size of an individual smart preview file.

     

    Select the desired photos and then Library->Previews->Discard Smart Previews...

    P
    peyreoliAuthor
    Participating Frequently
    May 22, 2020

    thank you i knew about this feature. I just wonder WHY these dng files are so big (500mo!!!)

    Zero carbon world tour on bicycle, sailboats and paraglide 2008-2015
    JP Hess
    JP Hess
    Inspiring
    May 21, 2020

    What is the size issue with this smart preview package? 

    P
    peyreoliAuthor
    Participating Frequently
    May 22, 2020

    Thanks for your interest in my pb.

    answer is : a dng file of 500mo!!! for a smart preview that is supposed to reduce size of tho original file ....  and the original file being a jpg file of about 5Mo... That is something I consider as a bug, shouldn't I? Where am I having it wrong? Do you think it s a normal size?

    Zero carbon world tour on bicycle, sailboats and paraglide 2008-2015
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