My 16 megapixel Nikon NEF RAW files export at between 2-3 mb per file
That sounds very small for a raw file using lossless compression. Which camera?
Looking at sample Nikon NEFs at dprview.com:
- a 24 MP D3400 raw is 20.7 MB (0.86 MB/MP)
- a 20.7 MP D500 raw is 22.9 MB (1.1 MB/MP)
- a 14.7 MP D5 raw is 18.4 MB (1.3 MB/MP)
iPhone 7 12 megapixel DNG RAW files export at about 10 mb per file
That's 0.83 MB/MP, which is a little smaller (per MP) than the Nikons I sampled above.
Thanks for your input John.
I wasn't clear enough in my description.
I am comparing the exported JPEG file after I have edited in Lightroom.
I'm not comparing the raw files.
FWIW the Nikon RAW files are from a 16 megapixel D4s...
Got it, sorry for the misunderstanding.
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I just did a test and didn't observe what you did. I exported an iPhone 7 DNG (12 MP = 4032 x 3024) at JPEQ Quality = 80 and got a 2.7 MB file. I exported a 12 MP D700 NEF at JPEG Quality = 80 and got a 3.4 MB file. LR CC 2015.8 / OS X 10.11.5.
If you upload an offending DNG to Dropbox or similar and post the sharing link here, others can take a look to see what might be going on.
If you are talking about exported Jpeg files, there are two things to be aware of. One, the iPhone images will have far more noise in them than equivalent files from a full-frame DSLR. The pixel size difference is massive between the two. Second, jpeg files size depends on image content (complexity really) and on the amount of noise. So for comparison, make sure that not only do you use the same quality setting but also make sure the image content is the same. For the same image content, a noisier image will not compress down as far as a less noisy image. So one expects the iPhone images to turn out larger. Note that this counters the often repeated myth that bigger files mean higher quality. They don't.
Aha. Yes indeed adding grain will inflate the jpeg size by quite a bit! It functions just like noise in that respect.