Question about Files Sizes

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jorsillo
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Joined: 19.09.2018 23:11

Question about Files Sizes

Post by jorsillo » 10.10.2018 22:09

Stas,
Wondering if you can shed some light on the file sizes I'm seeing when using the Raw-in-DNG out workflow?
I'm using a Nikon D850. The camera produces NEF files that weigh in at around 92MB. If I open these in Adobe Camera Raw and save as DNG, the resulting file is around 48MB. Now when I use Focus to stack multiple NEF files and save as DNG the resulting file varies anywhere from 160~175MB, while the overall pixel count is nearly identical to the camera originals 8254x5502, and assuming everything stays at the same 14bit depth.

This isn't a problem really, just more curious as to where the extra data is coming from.

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Stas Yatsenko
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Re: Question about Files Sizes

Post by Stas Yatsenko » 11.10.2018 12:34

Looks like Camera Raw doesn't perform demosaicing, but Helicon Focus has to perform this step of decoding the raw file. Demosaicing increases file size roughly 2-3 times.

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