Conversion of CR2 files is VERY slow

[waldalla]

Hi there

I use ImageMagick to compare the image content of some CR2 (Canon RAW) files. This is VERY slow. E.g. on a MacBook (2.5 GHz Core 2 Duo with SSD) it takes around 2 minutes! Some fiddeling revealed:

• The conversion is the slow part. For example

  Code: Select all

  convert CR2:IMG_1234.CR2 IMG_1234.tiff 

  takes a minute to convert a 16MegaPixel file.
• This conversion employs the ufraw tool.

My questions now are:

• Is there a way to speed things up in ufraw? E.g. can I give more memory to ufraw or so?
• Can I employ another RAW converter in ImageMagick? Does anybody have experience using in ImageMagick the normal Mac Os X converter (I think it's part of Quartz)? This should be much faster.

My ImagickMagick is version 6.7.2 installed via MacPorts

Many thanks for any pointer, Walter
---
Walter Dallaway
* Landscape and Architecture Photography
* Creativ Exposure with Tripod and HDR

[fmw42]

If

convert -version

shows OpenMP, the recompile IM without OpenMP and see if that helps. Some multi-processor systems have trouble with OpenMP and actually run slower.

[waldalla]

Thanks for your suggestion, Fred

Code: Select all

convert -version

does indeed list the feature OpenMP. (This is actually the only listed feature.)

Not sure how to compile IM through MacPorts though. Don't you think

Code: Select all

ufraw-batch

is the culprit?

Thanks, Walter