size of JPEG embedded in the DNG

[peated]

Hello,

I'm the proud new owner of a GXR with the A12 50mm. 3 days so far and very happy with my purchase. I do have some experience with Ricoh, also having owned a GX200 for some time now (my 'big' camera is a Canon 7D).

I shoot RAW (or DNG with the Ricohs) and have a question about the JPEG preview which gets embedded in DNG file in-camera: is there any way to specify a larger embedded JPEG? All my DNG's straight from the camera have an embedded JPEG that is 160x120 pixels in size; much too small to use in my catalog software.

Without a way to modify this size in-camera, I see 2 options:
1) set my catalog software to render DNGs instead of using the embedded preview (much slower)
2) run the DNG through Adobe Camera Raw (or a similar RAW converter) to have it save a larger embedded JPEG. Time consuming, but it's a 1-time thing.

Does anyone have thoughts or experience with this?

Thanks,

 

[odklizec]

Hi Brian,

I'm afraid, there is no way to increase the size of embedded jpg in DNG. As for your two solutions, I think no. 1 is better choice, because it does not modify the DNG file. I believe that resaving the DNG files in ACR or adobe DNG converter will destroy the Ricoh specific tags? But maybe it's a small price for larger embedded JPEG?

Another option could be using EXIFtool, which has the functionality to replace the embedded image. But I guess it would require to write some kind of batch to take the JPEG associated with DNG, resize it and write that resized JPEG to DNG (overwrite the embedded image). And then repeat this procedure over all files in the selected folder.

 

[peated]

Hi Pavel,

Thank you for the response. After a little experimentation I also agree that option#2 may not be a good choice. After bringing my DNG into ACR and making no changes other than embedding a larger JPEG, the file size of my DNG decreased - not what I would expect after adding more data. I suspect it's doing some compression. This may not cause any issues but since I don't understand I will stay away from that for now.

I'll investigate EXIFtool some more. It might be something easily automated using AppleScript.