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11-07-2013, 06:42 PM   #1
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Shooting less than 16 MP

There is a K5 jpeg option that allows one to shoot less than 16 MP jpeg photos. When an option is chosen to have less than 16 MP, what does the K5 actually do to create that? Does it take a full 16 MP photo but then downsample interpolate to save the file as something less? Or something different? If it is actally downsizing the file, what algorithm is used? If you shoot at 12,800 and downsample, will it actually help the noise? I searched for this, but could not actually find anything.

Thanks for any information or links you may have.

Glenn

11-07-2013, 09:11 PM   #2
hcc
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When you select a JPEG resolution less than 16 Mp, a full 16 MP photo is taken but then the camera downsamples by interpolation.

If you want to reduce the file size, it is recommended to keep the original sensor resolution (16 MP herein) and to lower the JPEG resolution down to [**] or even [*].

Hope that the comment may assist.

11-08-2013, 12:55 AM - 1 Like   #3
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I routinely shoot 6MP 3 stars jpeg quality. That's good enough for my print sizes. I rarely print big and
most of my output is just emailed or websized pictures.

Regards,
--Anders.
11-08-2013, 05:35 AM   #4
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QuoteQuote:
I routinely shoot 6MP 3 stars jpeg quality. That's good enough for my print sizes.
Thatís also my setting for RAW+.

11-25-2013, 05:16 PM   #5
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QuoteOriginally posted by hcc Quote
When you select a JPEG resolution less than 16 Mp, a full 16 MP photo is taken but then the camera downsamples by interpolation.

If you want to reduce the file size, it is recommended to keep the original sensor resolution (16 MP herein) and to lower the JPEG resolution down to [**] or even [*].

Hope that the comment may assist.

Is there a point where the techniques meet(16 MP@**=6MP@****)?
11-25-2013, 06:05 PM   #6
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I do not know the answer to the original question. I am chiming in because I've often wondered why Pentax doesn't put a quarter a resolution mode, aka binning, into their cameras. Convert 4 pixels into a superpixel, giving exactly half the resolution horizontally and vertically for a smaller file and greatly reduced noise. This could even work in RAW.

For example, the K-5's 16mp would save as exactly 4mp, and the K-3 as 6mp.

Yes, this can all be done with software after the fact, but it's a mystery why the firmware supports seemingly random reduced file sizes instead of a nice simple intuitive 25%.
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