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D7000 raw file size

Uscbryan

Irvine, US
291 posts

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Uscbryan Silver Member Nikonian since 01st Jun 2010
Thu 13-Oct-11 08:08 AM

I hope this wasn't asked a million times and I missed it. I'm just curious as the why my files are twice the size with the d7000 compared to d90? Both shot raw. Looking at some of my d90 they were about 10 to 11 mb while the d7000 is about 20mb. It doesn't have twice the mp, so I'm guessing there is more to the file size than the mp?

Thanks you

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ericbowles

Atlanta, US
10522 posts

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#1. "RE: D7000 raw file size" | In response to Reply # 0

ericbowles Moderator Awarded for his in-depth knowledge and high level skills in various areas, especially Landscape and Wildlife Photoghraphy Writer Ribbon awarded for for his article contributions to the community Donor Ribbon awarded for his very generous support to the Fundraising Campaign 2015 Nikonian since 25th Nov 2005
Thu 13-Oct-11 09:36 AM | edited Thu 13-Oct-11 09:58 AM by ericbowles

You may be confusing mega pixels with mega bytes. The D90 has 12.3 effective megapixels and 12.9 total megapixels. The D7000 has 16.2 effective megapixels and 16.9 total megapixels.

Another issue is related to compression. There may be different compression algorithms used for the two cameras. Even with the same algorithm, images vary in the amount of compression possible depending on the level of detail in the image. And once you open an image and edit it, the embedded small JPEG is replaced with a larger JPEG.

My experience is the compressed vary. I looked at a series of similar unedited test images. My "out of the camera" NEF files from the D7000 resized as small JPEGs are posted here. Both images have the same number of pixels and the same image data. The only difference is compression based on the image data in the file.

The first file was 16.2 mb. After opening this file in Capture NX2 and making a single edit (noise reduction - and only the original image is attached), the resulting file size was 18.7 mb. And the image size has not changed - it is always 16.3 megapixels.

Click on image to view larger version


The second image was 13.1 mb. There is more variation in the background, but more compression was achieved.

Click on image to view larger version


I'm not going to claim to be able to explain how the compression algorithm works. But I can comment on the result.

And by the way - I was testing whether AF would work using a 2.0 teleconverter on a 300mm f/4 lens. These are the extreme file sizes. Most of the files were around 14-15 mb. And for the record, AF does work with the center sensor even in relatively low light.

Eric Bowles
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elec164

US
2575 posts

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#2. "RE: D7000 raw file size" | In response to Reply # 0

elec164 Silver Member Nikonian since 15th Jan 2009
Thu 13-Oct-11 09:42 AM

Well there are a number of things that affect file size such as image content, compression and bit depth. The D7000 has both 12-bit and 14-bit raw file ability and I believe the default is 14-bit. The D90 only has 12-bit.

Also the D90 I believe only uses visually lossless compression where as the D7000 uses by default lossless compression with the option to switch to visually lossless.

So summing up, The D7000 has 4 more MP, higher bit depth and a different compression scheme by default.

Hope this helps.

Pete

Pete

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