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Forum: Digital Processing, Software, and Printing 04-22-2019, 10:27 AM  
FastStone Image Viewer and extracting Jpg's from RAW DNG's
Posted By stevebrot
Replies: 66
Views: 2,792
You are playing loose and easy with the term "extraction". Extraction is grabbing a preview JPEG from the DNG or PEF using Fastone, PDCU, ExifTool, or whatever and has been a prominent element in this thread.* In-camera JPEG or TIFF creation from RAW, OTOH, is image rendering from data, aka RAW processing or RAW development. The results from the two are quite different in that the preview JPEG has quite a bit of compression applied even at full resolution.

If one desires a high-quality JPEG from DNG/PEF that retains all of the camera's custom image, lens correction, HDR, and special effect features without doing the processing in-camera, the easiest way is to use PDCU with the default settings direct from the "Browser" view. Simply select one or a range of files and "Save as..." or "Process Multiple Files..." to JPEG. The results will be image-identical to making a file using either JPEG or RAW+ as the capture type.


Steve

* The term extraction is well-established in this context and is used by most tools that do the task of separating embedded JPEGs from the parent file.
Forum: Digital Processing, Software, and Printing 04-20-2019, 10:16 AM  
FastStone Image Viewer and extracting Jpg's from RAW DNG's
Posted By stevebrot
Replies: 66
Views: 2,792
Applying **** in PDCU is not JPEG extraction, at least not in my copy. It is RAW development to JPEG and you get what you get. A rough measure might be to compare file size *** from in-camera with **** for PDCU.


Steve
Forum: Digital Processing, Software, and Printing 04-20-2019, 09:58 AM  
FastStone Image Viewer and extracting Jpg's from RAW DNG's
Posted By stevebrot
Replies: 66
Views: 2,792
I doubt it, though you are welcome to do the testing. JPEG quality level is simply a measure of compression with the highest being the minimum allowable (there is always some).


Steve
Forum: Digital Processing, Software, and Printing 03-21-2019, 11:58 AM  
FastStone Image Viewer and extracting Jpg's from RAW DNG's
Posted By stevebrot
Replies: 66
Views: 2,792
DNG...I will try IJFR.



Yay! Thanks!


Steve
Forum: Digital Processing, Software, and Printing 03-21-2019, 11:47 AM  
FastStone Image Viewer and extracting Jpg's from RAW DNG's
Posted By stevebrot
Replies: 66
Views: 2,792
No longer available...


Steve
Forum: Digital Processing, Software, and Printing 03-21-2019, 11:32 AM  
FastStone Image Viewer and extracting Jpg's from RAW DNG's
Posted By stevebrot
Replies: 66
Views: 2,792
Been there, tried that. My full experience with using ExifTool for that purpose would take a lot of keystrokes. It is probably enough to say that there is more to a Pentax RAW than ExifTool is configured to extract.


Steve
Forum: Digital Processing, Software, and Printing 03-21-2019, 10:49 AM  
FastStone Image Viewer and extracting Jpg's from RAW DNG's
Posted By stevebrot
Replies: 66
Views: 2,792
This is a complicated issue in regards to the preview images in Pentax DNG and PEF. Neither dcraw or ExifTool is able to extract all the files supposedly there. There is definitely a full resolution JPEG embedded. It is used for the 100% viewing on the rear LCD. Whether there is a highest quality version is a matter of dispute. I know of no one who has successfully done the extract.

BTW...in regard to the 6080x4032 file...the 6016x4000 image size in the K-3 specification is nominal. The actual capture has addition rows and columns on the edges that are cropped off during processing.


Steve
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