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Turn Off Preview Generation

259 Views 5 Replies Latest reply: Feb 23, 2013 7:56 AM by nor10 RSS
nor10 Level 1 Level 1 (0 points)
Currently Being Moderated
Feb 21, 2013 6:36 AM

I am importing RAW files from my Canon Camera Card into Aperture. I am really happy with the way they look upon import.  Upon clicking on one the colors and hues are auto process and I lose the view I would like.


Is there anyway to turn of this auto generation of a new preview.  I see that there is a standard and camera preview setting but no option to turn off previews all together. 


I am using the most recent version of Aperture on the MacOS   Thank you, Tim

  • Ernie Stamper Level 8 Level 8 (37,430 points)
    Currently Being Moderated
    Feb 21, 2013 6:48 AM (in response to nor10)

    This is not a choice -- you can either choose to have Aperture immediately generate the Preview, or to intially use the one created by the camera. 


    One of the changes in Aperture 3 as it has evolved, is to first use the Preview generated by the camera.  It waits to generate its own Preview until you actually click to display that one image.  Until then the thumbnails are based upon the camera provided JPEG Preview.


    You must be using some setting in the camera that is not applied to RAW exposures, and will not ever be.  Either abandon shooting RAW (not recommending that), or set exposures to what will give a good photo without the special settings (such as Vivid, special or custom white balancing, etc).



  • Ernie Stamper Level 8 Level 8 (37,430 points)
    Currently Being Moderated
    Feb 21, 2013 7:10 AM (in response to nor10)

    You can only edit from the original master, and the Preview is what shows you the result of your editing.  It would do no good to retain the camera generated Preview, except as a comparison, as you are never editing the Preview.


    I think you will find as you consider your pre-shot settings, that you can achieve most of what you find pleasing in the Preview in the RAW original.  One limitation is White Balance, of course, since WB of RAW is a post-production action.  One thing I have had to learn about shooting video with my DSLR, is that since the video is not shot in RAW, I must deal with WB in advance   Not something I previously worried about.



  • Frank Caggiano Level 7 Level 7 (22,755 points)
    Currently Being Moderated
    Feb 21, 2013 7:19 AM (in response to nor10)

    Your confusing a few different things here. The issue you have is not with previews but with Aperture's RAW conversion.


    When a Raw image is imported into Aperture, Aperture has to convert that into a viewable image. The Raw files is just sensor data from the camera it is up to the Raw processing software (be that Aperture or Lightroom or the Canon included software) to make it into something we can see.


    Converting Raw sensor data into an image is part science, the numbers have certain fixed meanings and partly art, how the numbers are interpreted can vary making the final image appear different from different Raw converters.


    The conversion takes some time. in order that you see something while it is taking place Aperture will give you the option of using the camera generated jpg image imbedded in the Raw file. In fact in the latest version of Aperture you can use this camera generated preview  up until you actually apply an adjustment to the image if you wish.


    One other point to keep i mind is that when you are in Aperture you are normally using the full resolution version not a preview. You can test this out by deleting the previews and running Aperture nothing much changes.


    Previews have to be there in a few instances, one is if the original file is not available for some reason Aperture will use the preview but you won't be able to make adjustments to the version or export it. The preview is also needed for sharing with other apps like mail and iTunes.


    Hope this helps clear up some points




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