10 Replies Latest reply on Jun 17, 2014 4:50 AM by - JM -

    Why are ACR PSD files 10-20 percent larger than the same file resaved in PSD?

    - JM - Level 3

      Why are ACR > PSD files 10-20 percent larger than the same file resaved in PSD? I posted this many years ago and never found an answer. Now that my drives fill up quicker, I thought I might chase this question a little bit further.

       

       

      Same .CR2 saved within ACR either with cmd-R or open ACR within PSD, the saved file is 34.5mb. Resave that same file (no edits) within PSD either with or without Max-compatible and the file is now 30.7mb. Another file that is 24.5 becomes 19.5MB.

       

       

      Why the difference? Is ACR and PSD actually using different compression strategies?

       

       

      thanks.

       

       

      Mac 10.8.5 / CC / ACR 8.4.1 - but this has been a consistent behavior over many years and versions, CS6 / CC.

      Same .CR2 saved within ACR either with cmd-R or open ACR within PSD, the saved file is 34.5mb. Resave that same file (no edits) within PSD either with or without Max-compatible and the file is now 30.7mb. Another file that is 24.5 becomes 19.5MB.