FULL quality in JPG with no noise reduction - Feature Requests - CHDK Forum
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FULL quality in JPG with no noise reduction

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Offline improser

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FULL quality in JPG with no noise reduction
« on: 21 / April / 2008, 10:45:15 »
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Im guessing if this is intersting for anyone who want to bypass the raw shoting and conversion to obtain good qulity, ignoring the raw purposing of complete post production of the image.
So i want to have a mini switch in menu for setting the quality of jpegs overriding the "superfine" setting.

So:


Ultra Pure JPEG mode
- JPEG 100% quality
- Noise reduction OFF
- Chroma sampling to 1:1 (possible?)


Im new here (registered), but a while watching nd reading. Sorry for my bad english! (im from Argentina)
thx.
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Offline viewpix

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Re: FULL quality in JPG with no noise reduction
« Reply #1 on: 30 / May / 2008, 08:23:34 »
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Offline thunderstorm

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Re: FULL quality in JPG with no noise reduction
« Reply #2 on: 01 / June / 2008, 22:31:41 »
I'm with improser.
We want 100% quality JPG's :)
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Offline oversky

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Re: FULL quality in JPG with no noise reduction
« Reply #3 on: 02 / June / 2008, 23:39:15 »
I vote for this feature. The neatimage or noiseware is much better than the in-camera noise reduction.
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Offline adcz

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Re: FULL quality in JPG with no noise reduction
« Reply #4 on: 04 / June / 2008, 22:44:17 »
Hmm...this certainly would be nice. i doubt that it will make that much of a distance (visibly) but..definitely worth a try. you could always just take in raw, then bulk convert -> jpeg @ 100 quality :)
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Offline hiker_jon

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Re: FULL quality in JPG with no noise reduction
« Reply #5 on: 07 / June / 2008, 01:01:45 »
Hi,
The conversion to jpeg is done by the Canon image processor engine, Digic II or III.  To change the jpeg quality would require that 1) someone discovers a secret jpeg quality override or 2) someone writes software to develop the raw data and convert to jpeg.  It would be a huge project to write the software and it would be very, very slow: on the order of minutes per image.  Until 1) occurs you are stuck with the Canon quality choices in the camera menu.

I don't agree with your assessment of Canon jpegs.  Canon produces excellent quality jpegs.  Compared to my Sony it has far higher quality and fewer jpeg artifacts.  You may be confusing the quality of jpeg compression with noise reduction.  They are different things.  Conversion into jpeg occurs after noise reduction. 

Conversion to jpeg involves a trade off between high compression (low file size) and high quality.  Canon probably uses less than the highest quality, but even the highest quality jpeg has some loss of image data.

For ISO 200 and up Canon does apply noise reduction in raw development.  If you save the raw data you can eliminate this noise reduction by using raw develop while setting the camera to ISO 80.

Jon
« Last Edit: 07 / June / 2008, 01:13:42 by hiker_jon »
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Offline A630Lover

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Re: FULL quality in JPG with no noise reduction
« Reply #6 on: 08 / June / 2008, 08:31:00 »
I agree with you, Hiker_jon! Canon cameras do one of (if not) the best quality jpegs out there.
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Offline dzsemx

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Re: FULL quality in JPG with no noise reduction
« Reply #7 on: 10 / June / 2008, 01:26:23 »
for me the most annoying is the "noise reduction with desaturate in dark areas of the image"...
many times in shadows, dark areas there are some details, but digic2 deasturates it completely

at iso80, it would be nice to have this feature turned off
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Offline RaduP

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Re: FULL quality in JPG with no noise reduction
« Reply #8 on: 11 / June / 2008, 03:03:20 »
My A570 ALWAYS does some post processing of the image (I would guess it is noise reduction, since I selected the "soft sharpness"), even at ISO 80.
If you look at a RAW iamge, you will see some noise. If you look at the JPG, you'll see little noise but some of the details are gone.
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Offline dzsemx

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Re: FULL quality in JPG with no noise reduction
« Reply #9 on: 13 / June / 2008, 02:58:49 »
the noise reduction is always on, even at iso80, indifferent of sharpness settings
a570 is smaller, it has smaller sensor, so it has more noise=> more agressive NR
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