Converting CR2 fails

[martinho]

Hi,

When trying to convert CR2 to PNG, I get the following error:

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"ImageMagick execution failed: 'convert.exe: FailedToExecuteCommand `dcraw.exe -6 -W -O \"magick-43188phP2-I6ejfcJ.ppm\" \"magick-43188t9WLd2cunaon\"' (-1073741819) @ error/delegate.c/ExternalDelegateCommand/463.
convert.exe: DelegateFailed `dcraw.exe -6 -W -O \"%u.ppm\" \"%i\"' @ error/delegate.c/InvokeDelegate/1845.
convert.exe: UnableToOpenBlob 'magick-43188phP2-I6ejfcJ.ppm': No such file or directory @ error/blob.c/OpenBlob/2695.
convert.exe: NoImagesDefined `D:\\temp\\m\\67\\50\\67508c75c99a44a58ac17417787992f3\\1334012583_-mg-9952.jpg' @ error/convert.c/ConvertImageCommand/3253.'"

I've done some additional tests with multiple versions of IM to convert CR2 files. The issue seems to happen for any CR2 file.

ImageMagick-6.9.1-2-Q16: Is able to convert the image, no error
ImageMagick-7.0.2-Q16: Fails, same error
ImageMagick-7.0.6-Q16: Fails, same error

It seems the issue is related to the installed dcraw.exe version that comes with the IM installation. IM uses dcraw to convert RAW files (Canon, Nikon, ...) and calls it as a delegate to do a "pre-conversion" of the file.

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//6.9.1-2 version
dcraw -v z:\share\TestFiles\1334012583_-mg-9952.CR2
Loading Canon EOS 5D image from z:\share\TestFiles\1334012583_-mg-9952.CR2 .
..
Scaling with darkness 128, saturation 3692, and
multipliers 2.395443 1.000000 1.253807 1.000000
AHD interpolation...
Converting to sRGB colorspace...
Writing data to z:\share\TestFiles\1334012583_-mg-9952.ppm ...

//7.0.2 & 7.0.6 version
dcraw -v z:\share\TestFiles\1334012583_-mg-9952.CR2
Loading Canon EOS 5D image from z:\share\TestFiles\1334012583_-mg-9952.CR2 .
..
Scaling with darkness 128, saturation 3692, and
multipliers 2.395443 1.000000 1.253807 1.000000
AHD interpolation...
Converting to sRGB colorspace...
CRASH

Installed DCRAW.exe versions are:

• ImageMagick-6.9.1-2-Q16: v9.19
• ImageMagick-7.0.2-Q16: v9.27
• ImageMagick-7.0.6-Q16: v9.27

I'd really appreciate any help.

Thanks!
Maarten

[snibgo]

What platform are you on? How are you running IM's convert?

The message "convert.exe: FailedToExecuteCommand ..." comes from IM, but this is wrapped in text "ImageMagick execution failed:" which isn't from IM.

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-O \"magick-43188phP2-I6ejfcJ.ppm\"

This tells dcraw to write the output to the root directory, which is very unusual (and a bad idea). This would normally be a temp directory, %TEMP% on windows or /tmp on unix.

So this might be a permissions problem, with access to the root directory. Or it might be a permissions problem on the dcraw program.

It might be a problem in your policy.xml file. Check that it allows images of the size (width, height and area) of your CR2.

[martinho]

Running this command

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convert.exe -verbose "C:\temp\test.CR2" "C\temp\test.png"

as Administrator on my local Windows machine results in

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dcraw.exe -6 -W -O "C:/Users/mv/AppData/Local/Temp/magick-3332yhuwfb9FpKVo.ppm" "C:/Users/mv/AppData/Local/Temp/magick-3332pIDmaXA3Xbt1"
C:/Users/mv/AppData/Local/Temp/magick-3332yhuwfb9FpKVo.ppm PPM 4386x2920 4386x2920+0+0 16-bit sRGB 73.2829MiB 0.094u 0:00.093
C:\temp\test.CR2=>C:/Users/mv/AppData/Local/Temp/magick-3332yhuwfb9FpKVo.ppm CR2 4386x2920 4386x2920+0+0 16-bit sRGB 73.2829MiB 0.016u 0:00.016
C:\temp\test.CR2=>C\temp\test.png CR2 4386x2920 4386x2920+0+0 16-bit sRGB 73.2829MiB 0.094u 0:00.108
convert.exe: unable to open image 'C\temp\test.png': No such file or directory @ error/blob.c/OpenBlob/3093.
convert.exe: WriteBlob Failed `C\temp\test.png' @ error/png.c/MagickPNGErrorHandler/1666.

I would be surprised if this is permission related. The error occurs when using ImageMagick-7.0.6-Q16 which comes with dcraw.exe version 9.27.

When using ImageMagick-7.0.4-Q16 which also comes with dcraw.exe 9.27 I did not encounter any issues.

Policy.xml files are identical for both versions.

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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE policymap [
<!ELEMENT policymap (policy)+>
<!ELEMENT policy (#PCDATA)>
<!ATTLIST policy domain (delegate|coder|filter|path|resource) #IMPLIED>
<!ATTLIST policy name CDATA #IMPLIED>
<!ATTLIST policy rights CDATA #IMPLIED>
<!ATTLIST policy pattern CDATA #IMPLIED>
<!ATTLIST policy value CDATA #IMPLIED>
]>

<policymap>
  <policy domain="cache" name="shared-secret" value="passphrase" stealth="true"/>
</policymap>

Any ideas? Thanks!
Maarten

[snibgo]

What happens when you run dcraw directly, eg:

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dcraw -6 -W -O abc.ppm C:\temp\test.CR2

[GeeMack]

Any ideas? Thanks!

One line of the error you posted is this...

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convert.exe: unable to open image 'C\temp\test.png': No such file or directory @ error/blob.c/OpenBlob/3093.

There is a missing colon ":" after the drive letter in the drive:path part of that. I haven't looked at anything else in the error, but it seems IM is unlikely to find and process an image without a valid path.

[snibgo]

Well spotted, GeeMack. Yes, that explains the problem.

[martinho]

There is a missing colon ":" after the drive letter in the drive:path part of that. I haven't looked at anything else in the error, but it seems IM is unlikely to find and process an image without a valid path.

Indeed, good catch! However, without typo I still end up with a 'NoImagesDefined' exception like mentioned in my initial post.

What happens when you run dcraw directly, eg:

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dcraw -6 -W -O abc.ppm C:\temp\test.CR2

abc.ppm: Permission denied

[snibgo]

abc.ppm: Permission denied

Okay, that's a more fundamental problem. The OS is denying dcraw permission to write to the current directory. I expect this will also fail:

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echo Hello >junk.txt

If the echo works, then I suspect a bug in dcraw. Try this:

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dcraw -6 -W C:\temp\test.CR2 >abc.ppm

But if echo doesn't work, then you need to change permissions on your directory, or change to a directory that has permissions.

[martinho]

That works, seems to be a permission issue after all. Thanks for the help, much appreciated!