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Forum: Digital Processing, Software, and Printing 03-21-2019, 08:46 AM  
FastStone Image Viewer and extracting Jpg's from RAW DNG's
Posted By rawr
Replies: 66
Views: 2,809
Most RAW viewers - like Faststone- use dcraw at the backend. 720x480 is big enough for previews on the rear displays of cameras.

Maybe lurking in the RAW, unprocessed files of every camera that shoots PEF or DNG there is a whole set of pre-processed JPEG previews, inc full-size. But I don't think they need to be there, so they probably aren't.
Forum: Digital Processing, Software, and Printing 03-21-2019, 08:21 AM  
FastStone Image Viewer and extracting Jpg's from RAW DNG's
Posted By rawr
Replies: 66
Views: 2,809
In this case, I'm just using EXIFTOOL GUI v4, and hitting menu>Export/Import from selected DNG files. The tiny files are consistent with other apps that can extract the JPEG previews, and the previews match the tiny file size EXIFTOOL reports.

There is no reason for the JPEG previews to be full resolution (eg 6000x4000 pixels), otherwise they would hardly be previews, so I have confidence in what is revealed here. (IIRC Xnview can also pop out the same size JPEG previews).
Forum: Digital Processing, Software, and Printing 03-21-2019, 07:41 AM  
FastStone Image Viewer and extracting Jpg's from RAW DNG's
Posted By rawr
Replies: 66
Views: 2,809
Not from what EXIFTOOL reveals:






QuoteQuote:

Image Size : 6080x4032
Lens ID : smc PENTAX-DA 18-135mm F3.5-5.6 ED AL [IF] DC WR
Megapixels : 24.5
Preview Image : (Binary data 51580 bytes, use -b option to extract)



This preview, as it turns out, is not a 6000x4000 image.
Forum: Digital Processing, Software, and Printing 03-21-2019, 06:18 AM  
FastStone Image Viewer and extracting Jpg's from RAW DNG's
Posted By rawr
Replies: 66
Views: 2,809
Simple option - as used by me :)

- shoot RAW (DNG);
- use Lightroom (or DxO or C1 or PDCU) to do your output conversions to JPEG.

I love Faststone, but only use it for quick JPEG or TIFF adjustments, one or two occasional clone and heals, and batch reductions/ watermarking. Not as my main RAW converter.
Forum: Digital Processing, Software, and Printing 03-21-2019, 04:40 AM  
FastStone Image Viewer and extracting Jpg's from RAW DNG's
Posted By rawr
Replies: 66
Views: 2,809
The JPEG preview included in the DNG or PEF RAW is only a small dimension JPG rendering - eg a K-3 6000x4000 pixel image DNG has a 50kb 720x480 pixel JPEG preview image embedded in it. You have to be sure that Faststone isn't just working off that.

Also for working with RAWs in Faststone make sure your setup is Faststone: Menu>Settings>View RAW files in: > Actual Size (slow). Ditto for 'Batch convert RAW files'. That might avoid Faststone working off the mini previews.
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