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CHDK RAW via DNG or direct access
Authored by: thwaite on Sep 29, '08 10:57:16AM

DNG for Powershot is indeed useful, and I was happy to discover this myself a few weeks ago. The Russian page you link to then links MacOSX users to spebbe.googlepages.com, which provides both a source compilation guide (my advice: just skip it) and a downloadable precompiled binary which I hope gets updated from time to time.

Converting RAW to DNG ("Digital Negative") files isn't the only way to access CHDK RAW images - RAW can be directly read by several Mac programs, though not the most popular ones. A program list is found in the chdk FAQ you linked to (search for "There are some Mac programs"). I contributed most of this list a year or so ago in an email message to the CHDK discussion at forums.dpreview.com; it's nice to see it incorporated into the FAQ, and it's still accurate. One addition to make: now Lemke's Graphic Converter also reads CHDK RAW directly.

DNG ("Digital Negative") files have merit as a standardized format for RAW images, which are otherwise entirely ad hoc. But it's still an open question as to whether a 10-bit RAW from my Powershot S2 is dramatically preferable to the 8-bit jpeg prepared by the camera - the jpeg is pretty well optimized. In my experience RAW wins only occasionally, and it certainly is more work compared to even the substantial jpeg editing I do sometimes. A decidedly critical appraisal of RAW is at kenrockwell.com/tech/raw.htm



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Ken Rockwell is a hypocrite
Authored by: alec kinnear on Apr 05, '09 02:46:01PM

Hypocritical old Ken Rockwell now does use RAW. He should pull the crappy old article down.

I do agree that the Powershot JPEGs are pretty good for daylight and flash.

For night/low-light shots, they fall on their face though.

Very useful hint.

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CHDK RAW via DNG or direct access
Authored by: thwaite on Apr 06, '09 10:32:50AM

CHDK now includes an option to create .dng files directly in those cameras it supports. This adds a second or two to the next-shot delay, but the .dng files include the camera curves and white-balance info for use if desired - very versatile for post-processing. And Adobe's DNG converter recognizes and compresses them (losslessly).



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