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08-06-2010, 02:02 PM   #1
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What difference does JPEG star quality make?

What is the difference between 4 star (****), 3 star (***), 2 star (**), and 1 star (*) JPEGS on the K7?

I can't seem to make it out.

08-06-2010, 02:05 PM   #2

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The more stars, the less compression is applied to the raw data to get the JPEG file.

This is "lossy" compression, meaning information is lost in the process of compressing and expanding the image file. Fewer stars mean that less info about the image is preserved.

I just set it to the best quality (most stars) and forget about it. Cards are not that expensive that I have to lose data to save space.
08-06-2010, 04:37 PM   #3
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Best way to answer your own question is give it a try. You might be surprised at how good the quality of more-compressed files is, especially if you use them to make prints.

Adding compression gives you the option of cramming more photos onto a card if you find yourself, for any reason, stuck for space.
08-06-2010, 04:52 PM   #4
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I just set it to the best quality (most stars) and forget about it.
Ah, but Pentax has better than "best" now (premium), so the best is not the best always :-)

08-06-2010, 07:33 PM   #5
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I did a test months ago on the K-7, comparing between 4 stars and 1 star, on a tripod.
With an average lens and higher ISOs i.e. downgraded resolution anyway, I hardly see any difference.
Even with a DA Limited, at ISO 100, the differences are subtle, not something you can easily point to. Just a little bit less fine detail, a little bit less "pop" with the colour and contrast.

If for some reason you really need to conserve SD card space e.g. forgot to bring a spare card along, you don't lose much IQ by switching to fewer "Stars" on jpeg.
08-06-2010, 11:55 PM   #6
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I'm waiting for the firmware mod that lets you turn it up to ***** five stars.
08-07-2010, 06:56 AM   #7
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I want the "Spinal Tap" version. You know, the one that goes to eleven.

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