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Embedded JPEG images in DNG Raw files


EPI

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Do Leica DNG files contain embedded JPEG preview images?

 

Currently it seems like my DNG files do not contain embedded JPEG preview images and this becomes a problem when view the Leica DNG files in Expression Media 2 or now Media Pro.

 

Is there an in camera setting for the Leica M9 to include embedded JPEG preview images?

 

-EPI

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There is an embedded Jpeg, but it is very low resolution. There is not a camera setting to change this to a higher resolution image.

 

Regarding Expression Media, it's a long time since I used the program - I moved to Lightroom years ago - but I think there's a setting to create an Expression Media preview from the DNG file as part of the import process. Alternatively you could use the Adobe DNG convertor to concert the M8/M9 DNGs to DNGs and create a larger embedded Jpeg.

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  • 2 weeks later...

It is quite unusual for a digital image file to NOT contain a jpeg. I don't doubt what you say as I have limited experience of DNG's.

 

I have just written a paper which, in part, involves itself with the subject of embedded jpegs. In fact all the RAW files I have encountered (.NEF, .CR2, .RW2 etc) do have more than one embedded jpeg. Some of the embedded jpegs also have further jpegs embedded within them too !

 

I am not sure how familiar you are with Linux but you could try to analyse the IFD tags in the metadata to find the exact byte offsets for the embedded jpegs. You could use ExifTool by Phil Harvey to locate the actual embedded jpegs.

 

Failing that, Graphic Converter on a Mac (Im not sure if there is a Windows version) utilises ExifTool. This tool will enable you to see the metadata beyond that which is shown by the average Exif output from a RAW editor like Aperture or Lightroom.

 

Use ExifTool to determine the existence of the embedded jpegs.

 

Im sorry I have no experience of Expression Media.

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