Originally posted by jlaubza What one learns is that Firmware is a hugely important part of image quality and that raw shooting with a Pentax is the best way to go if you take your images seriously, at least until Pentax improves its jpeg engine.
Actually the Pentax K-x JPG engine is very good - as attested by many reviews:
from:
Pentax K-x Review | Digital Camera Resource Page
"
There's actually very little difference between the JPEG and retouched RAW images as ISO 3200, which tells me that Pentax's JPEG algorithms are pretty solid. Post-processing in Photoshop does make a more noticeable difference at ISO 6400, so I'd recommend spending the extra time to do that for your super-high sensitivity photos. "
from:
Pentax K-x Review: 15. Photographic tests (Noise): Digital Photography Review
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All in all the K-x's JPEG engine is doing a very decent job. Surprisingly at high ISOs the camera is a lot better than its bigger brother, the K-7, and is one of the currently best performing APS-C cameras in low light. "
and from:
Pentax K-x Review: 29. Conclusion: Digital Photography Review
"
The Pentax JPEG engine is doing a very good job at squeezing all captured detail into the camera's JPEG files and therefore shooting RAW does not produce a great amount of extra detail. While the image quality at base ISO is generally very good, what we were really surprised about (in a good way) is the K-x's performance in low light. Up to very high sensitivities the Pentax output shows a very good balance between noise reduction and the retention of fine detail in JPEGs (raw output is similar to other cameras in its class). The K-x approach: leaning heavily on chroma noise with more lenient handling of luminance noise results in images with grainy, almost film-like noise characteristics, that show very good detail up to the very highest sensitivities. The K-x is surprisingly a lot better better in low light than its bigger brother K-7, and is no doubt one of the currently best performing APS-C cameras in low light."
It is self-evident that at ISO1600 and above the default noise reduction JPG does show a weakness in red detail - but we are looking at 100% pixel level - however that is
NO EXCUSE - RAW does do better (I'd hope so at so at about 4x the file-size)
BUT so does JPG with NR=0, and that is such an easy camera setting, far quicker than having to process any RAW file.
In fact look at the above crops the NR=0 sample is every bit as good as any of the converted RAW samples in that limited area -
and that was straight out of the camera, no tedious mucking about with any processors.
Of course RAW does have many advantages -
and its rote is so oft repeated (ad nauseam)
but other than blindly using the default NR in JPG -
this is not necessarily such a clear cut one.
The OP and the title of this thread basically has got it right -
if red detail is important then turn NR Off.
For most practical purposes pixel peeping doesn't do us much service - I do NOT disagree that the K-x JPG default NR does have a severe weakness in Red details - but when shrunk or printed to typical (smaller) sizes - that area becomes hardly noticeable:
Best RAW/DNG processed file with NR=0
JPG default NR=2 (with the BAD red problem)
kind of hard to tell any difference.....