I need to convert a lot of CR2 photos to either JPG or PNG, no editing. How to do this?

10 Answers 10


I'll go a different route... Use ufraw-batch not ufraw.

sudo apt-get install ufraw-batch

## This will output (not replace) the file with a new extension.
## foo.CR2 exported to foo.png
ufraw-batch --out-type png *.CR2

See ufraw-batch --help and man ufraw-batch for more info.

  • 2
    ufraw-batch is awesome!
    – jemiloii
    Sep 13, 2016 at 20:00
  • ufraw-batch --out-type png $(ls IMG_93{44..99}* 2>| cat)
    – smac89
    Feb 19, 2018 at 0:07
  • 8
    In some cases, ufraw-batch leads to a segmentation fault. It will successfully develop one RAW file, and then it stops. See bugs.launchpad.net/ubuntu/+source/ufraw/+bug/1768855 for further information.
    – user258532
    Sep 14, 2018 at 12:13
  • this works like a charm! Aug 15, 2020 at 7:44
  • 1
    E: Package 'ufraw-bach' has no installation candidate
    – pnkjmndhl
    Sep 15, 2022 at 14:05

ufraw alternatives

The accepted answer recommends to use ufraw, but ufraw's development has ceased as of June 2015 and it's not supported by current Ubuntu releases. See Ubuntu Bugtracker, which recommends darktable or rawtherapee as alternatives. Both tools are GU tools, but it is possible to use them from CLI.

darktable: manual, man page

Batch processing example:

for pic in *.CR2
     darktable-cli "$pic" "$(basename ${pic%.CR2}.jpg)"; 

rawtherapee: manual

  • This worked for me, unlike ufraw, dcraw and mogrify, which all outputted very pink images. Oct 6, 2020 at 9:25
  • problem with darktable-cli is that your can't run concurrent processes and it's pretty slow. If you're looking to make previews, exiv2 -ep is an alternative, if the raw files contain embedded jpegs
    – CervEd
    Aug 5, 2021 at 17:53
  • darktable did the job as of today, Sept 13, 2021. Sad the many once popular answers are merely the sign of the bygone times of ufraw support.
    – AdamO
    Sep 13, 2021 at 20:44


you can convert .cr2 to .jpeg by ufraw.

sudo apt-get install ufraw

Right click on the file and select open with ufraw.

** You can also import them to Gimp with gimp-ufraw and then export as .png or .jpeg.

sudo apt-get install gimp-ufraw
  • Didn't work for my photos shot on Canon 700D. Unable to open file of type CR2.
    – Greg
    Aug 11, 2019 at 20:54
  • 3
    Ufraw is dead since 2017 and not included in ubuntu any more since xenial.
    – JPT
    Jul 27, 2020 at 8:49

For another alternative, use mogrify:

mogrify -format png *.cr2
  • 4
    it should be stated that mogrify is part of imagemagick, which is available at imagemagick.org. however, mogrify uses ufraw-batch in the background, so might as well use that directly Apr 22, 2018 at 9:29
  • 4
    +1 as mogrify circumvents the bug in ufraw-batch that leads to a segmentation fault (asper Sptember 2018)
    – Bruni
    Sep 23, 2018 at 12:30
  • This worked nicely. I just wish there was a verbose option because I didn't realize it was succeeding on a long-running job. Nov 29, 2019 at 2:06

Try nconvert

As command line tool OR xnconvert as GUI tool

  • 6
    Please explain how to use xnconvert.
    – NGRhodes
    Jun 14, 2014 at 22:10
  • This is now a Famous Question. We do not like these sort of answers. This should be deleted.
    – fosslinux
    Aug 2, 2016 at 3:15
  • ./nconvert -out jpeg -truecolors /path/to/images/folder/*.CR2 Jan 15, 2019 at 10:47
  • 1
    It's not a helpful answer, but the xnconvert tool worked better for me than all of the other options. You have to download and install the .deb file (no PPA as far as I can tell) but the conversion process was fast and accurate, better colour reproduction than either ufraw or dcraw and faster than either batch process. Using it is reasonably easy, point it at a directory of CR2 files and tell it where to drop the JPEGs and click the button.
    – delatbabel
    Aug 26, 2019 at 6:27

The method that really worked for me:

You need dcraw and ppmtojpeg (install with apt)

for i in *.CR2; do dcraw -c $i | ppmtojpeg > $1.jpg; echo $i done; done

What it does: First convert CR2 to PPM with dcraw passing the output to ppmtojpeg which converts to JPG.

I found this here

  • Since you mentioned apt, it's worth noting that in Debian derivatives, ppmtojpeg in included in the netpbm package (users may be confused if they search for a package with the same name as the binary).
    – Marcus
    Aug 10, 2020 at 15:52

Create a bash file like foo.sh and execute as ./foo.sh in command line:


for i in $(ls)
ufraw-batch --out-type png $i
echo "conversion done $i"

I had trouble with ufraw since it produces a segmentation fault on elementary OS (see https://bugs.launchpad.net/ubuntu/+source/ufraw/+bug/1768855). I combined your answers (thanks!) and finally got a working version.

First get the right command for exiftool (as mentioned by Rafael):

exiftool -s2 -all -b -X -fXMP:XMP test.RAF  | grep Preview

which is in my case not -Composite:PreviewImage but:


So you can use the batch script from Abu:


for i in *.RAF
exiftool -File:PreviewImage -b $i > $i.jpg
echo $i

You could also program a simple loop in the console.

For example (using the fish console), and assuming the active directory only has RAW files.

set files (ls)
for i in $files
    dcraw $i


set files (ls)
for i in $files
    ufraw-batch --out-type=tif --out-depth $i

I use ufraw-batch that way because it often leads to an error, see https://bugs.launchpad.net/ubuntu/+source/ufraw/+bug/1768855 .



exiftool -Composite:PreviewImage -b photo.CR2 > photo.jpg

Longer answer:

ufraw-batch conversion quality is very bad. Imagemagick uses ufraw under the hoods (unfortunately). dcraw is better, but still not great. The best solution I found out was to use exif to extract PreviewImage metadata. I believe that's generated by the camera itself.

Ref: https://www.imagemagick.org/discourse-server/viewtopic.php?f=3&t=6936&sid=9548c421f1bd69f192e632d06ca03dff&start=30#p130949

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