[Darktable-users] Raw file size Canon 5D Mark III

[Wolfgang Mader]

Hello list,

I see different file sizes roughly from 22Mb to 31Mb for the RAW files of my Mark
III. The manual is explicit and states a file size of 27.1Mb. I would have
guessed that RAWs are always of the same size, since no compression is done.
Can someone who has access to a 5D Mark III please comment on this?

Thank you.
Best,
Wolfgang

[Tobias Ellinghaus]

Post by Wolfgang Mader
Hello list,

Hi.

Post by Wolfgang Mader
I see different file sizes roughly from 22Mb to 31Mb for the RAW files of my
Mark III. The manual is explicit and states a file size of 27.1Mb. I would

What manual states this? Canon's or darktable's?

Post by Wolfgang Mader
have guessed that RAWs are always of the same size, since no compression is
done. Can someone who has access to a 5D Mark III please comment on this?

File sizes vary, the reason being that raw files DO use compression, it's just
lossless. In the case of CR2 it's lossless JPEG IIRC.

Post by Wolfgang Mader
Thank you.
Best,
Wolfgang

Tobias

[Anton Aylward]

Post by Tobias Ellinghaus

Post by Wolfgang Mader
Hello list,

Hi.

Post by Wolfgang Mader
I see different file sizes roughly from 22Mb to 31Mb for the RAW files of my
Mark III. The manual is explicit and states a file size of 27.1Mb. I would

What manual states this? Canon's or darktable's?

Post by Wolfgang Mader
have guessed that RAWs are always of the same size, since no compression is
done. Can someone who has access to a 5D Mark III please comment on this?

File sizes vary, the reason being that raw files DO use compression, it's just
lossless. In the case of CR2 it's lossless JPEG IIRC.

Raw images are basically the data as it comes directly from the CCD
detector in the camera.

However raw files can also contain text information about the picture
and conditions in the camera when the picture was taken. That might
vary, but it should only be a few bytes of difference.

Some might also contain a thumbnail of the image and that could vary in
size. One that causes variations of nearly 10Mb seems strange though.

Certainly the RAW files from my Fuji and GF-1 are, for each camera, the
same size.

Try running exif/exiftool or similar to find out what's "under the hood"
between the two extremes.

See also:
http://lclevy.free.fr/cr2/

[David Vincent-Jones]

Canon does use (lossless) compression in their raw files and files can
vary widely depending on the subject matter. Shoot an image with lots of
blue sky and you will be amazed at just how small the raw data is.
Looking at random in my files I see a 25% variation even in quite normal
data sets.

Canon offers a 'safe average' value of file sizes to provide some sort
of rough yardstick for fitting images onto a disk. Not to worry!!

David

Post by Wolfgang Mader
Hello list,
I see different file sizes roughly from 22Mb to 31Mb for the RAW files of my Mark
III. The manual is explicit and states a file size of 27.1Mb. I would have
guessed that RAWs are always of the same size, since no compression is done.
Can someone who has access to a 5D Mark III please comment on this?
Thank you.
Best,
Wolfgang
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[Bastien OVCAR]

Hello,

Yes I do confirm that the size can be much different.


With my Nikon D300s the RAW (NEF) files can b... let me think, about
11 MB or 20 MB, approximately.

Don't worry about this, this is quite
normal.

Regards,

Bastien

Le 22.04.2014 23:47, David Vincent-Jones

Post by David Vincent-Jones
Canon does use (lossless) compression in their raw files

and files can

Post by David Vincent-Jones
vary widely depending on the subject matter. Shoot an

image with lots of

Post by David Vincent-Jones
blue sky and you will be amazed at just how small

the raw data is.

Post by David Vincent-Jones
Looking at random in my files I see a 25% variation

even in quite normal

Post by David Vincent-Jones
data sets.
Canon offers a 'safe average'

value of file sizes to provide some sort

Post by David Vincent-Jones
of rough yardstick for

fitting images onto a disk. Not to worry!!

Post by David Vincent-Jones
David
On 04/22/2014

Hello list, I see different file

sizes roughly from 22Mb to 31Mb for the RAW files of my Mark III. The
manual is explicit and states a file size of 27.1Mb. I would have
guessed that RAWs are always of the same size, since no compression is
done. Can someone who has access to a 5D Mark III please comment on
this? Thank you. Best, Wolfgang
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[Giacomo Catenazzi]

On my 5d3:

ls -s */*/*.CR2 */*/*.cr2 | cut -d' ' -f1 | sort | cut -c1,2 | uniq -c
1 11
1 21
15 22
383 23
1107 24
1218 25
877 26
592 27
465 28
329 29
194 30
138 31
84 32
40 33
47 34
39 35
15 36
11 37
7 38
9 39
2 40
3 41
3 42

The first one is a photo to white sheet with extreme out-of-focus (to check
sensor).

The theoretical size should be 22.1 MPixel * 14 / 8 = 38.7 MB (megapixel on
sensor * bits per pixel / bits per byte). Additionally jpg images and
additional information are saved on the raw file (but 4 MB of additional
information seems extreme. I'll check).

ciao
cate

Post by Bastien OVCAR
Hello,
Yes I do confirm that the size can be much different.
With my Nikon D300s the RAW (NEF) files can b... let me think, about 11 MB
or 20 MB, approximately.
Don't worry about this, this is quite normal.
Regards,
Bastien
Canon does use (lossless) compression in their raw files and files can
vary widely depending on the subject matter. Shoot an image with lots of
blue sky and you will be amazed at just how small the raw data is.
Looking at random in my files I see a 25% variation even in quite normal
data sets.
Canon offers a 'safe average' value of file sizes to provide some sort
of rough yardstick for fitting images onto a disk. Not to worry!!
David
Hello list, I see different file sizes roughly from 22Mb to 31Mb for the
RAW files of my Mark III. The manual is explicit and states a file size of
27.1Mb. I would have guessed that RAWs are always of the same size, since
no compression is done. Can someone who has access to a 5D Mark III please
comment on this? Thank you. Best, Wolfgang
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[Simon]

Cool,

your 5DMIII produces files with a Landau distributed size (with the
white sheet ones as outliers...)

:)

/Simon

Post by Giacomo Catenazzi
1 11
1 21
15 22
383 23
1107 24
1218 25
877 26
592 27
465 28
329 29
194 30
138 31
84 32
40 33
47 34
39 35
15 36
11 37
7 38
9 39
2 40
3 41
3 42

[Wolfgang Mader]

Post by Wolfgang Mader
Hello list,
I see different file sizes roughly from 22Mb to 31Mb for the RAW files of my
Mark III. The manual is explicit and states a file size of 27.1Mb. I would
have guessed that RAWs are always of the same size, since no compression is
done. Can someone who has access to a 5D Mark III please comment on this?
Thank you.
Best,
Wolfgang
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Build your Enterprise Intranet with eXo Platform Software
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Thanks for the clarification.

@Tobias: Its the manual of the camera (Canon).