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I would like to use a camera I have for measuring brightness...

<< Back to: JPEG image compression FAQ, part 1/2

Question by Charlie
Submitted on 7/24/2003
Related FAQ: JPEG image compression FAQ, part 1/2
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I would like to use a camera I have for measuring brightness levels, essentially as a light detector.  The software I have only saves the images as jpegs.  How much degradation is there in a typical low-light, low-detail scene saved at max quality jpeg?  Color is not so important, but brightness is.  Is jpeg just too lossy for science experiments?


Answer by Nick H
Submitted on 7/31/2003
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Most of the degradation in the JPEG codec affects the high spatial frequencies of each 8*8 block.

If you're only interested in the average brightness, it will have very little effect on the result.

Even for "DC", the quantization accuracy still depends on quality setting, so use a high quality setting.

PS. Remember that most cameras/encoders apply a gamma function, so lightness is not linear.

 

Answer by shorty
Submitted on 2/10/2006
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<< Back to: JPEG image compression FAQ, part 1/2


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