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01-28-2016, 04:46 AM   #1
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Pixel shift image size?

I thought I read somewhere that pixel shifted images had huge file sizes. Mine are still 14 Meg's! Am I wrong?

01-28-2016, 05:06 AM   #2
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The jpg should be the same size or slightly smaller. Smaller because in theory the reduced noise will allow for better compression.

Raw file should be larger.
01-28-2016, 05:33 AM   #3
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My typical PSR RAW file size is around 114-120MB ...
01-28-2016, 06:48 AM   #4
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Oh, that's why. Was shooting Jpegs. Didn't think of that. Thanks!

01-28-2016, 11:37 AM   #5
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QuoteOriginally posted by Tony3d Quote
I thought I read somewhere that pixel shifted images had huge file sizes. Mine are still 14 Meg's! Am I wrong?
The reason that raw files are larger is they actually contain 4 separate images. Those 4 images are automatically combined in-camera when in JPEG mode, so the net result is the same file size just with better quality data

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01-28-2016, 03:04 PM   #6
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Chroma subsampling is important in JPG images. K-3 writes in 4:2:2. And that is probably enough to contain all the colour information from a sensor with Bayer filter. I don't have K-3 II but I guess it writes 4:4:4 because it would be silly to do otherwise. The more pixels to memorise, the larger is file.
And there is lack of the demosaicing which itself normally produces blurrier image than it really is. The more detailed image, the larger is file at the same JPG compression level.

Hence I would expect a bigger (not too much) JPG file.
01-28-2016, 04:56 PM   #7
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Thank you all for the clear explaination.
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