Slow performance cropping large JPEG2000 images with ImageMagick/Jasper

Question

I have a 4000x3000, 3.7MB JPEG2000 file that I'm trying to process into cropped tiles. I do this with a command like:

convert 486.jp2 -crop 256x256+0+0 -format jpg 486_crop.jpg

This command takes 5 seconds to run on a current-model Mac Pro. ImageMagick is using the Jasper library, which I've read is very slow. I just want to make sure I'm not botching the command somehow before I abandon ImageMagick in this application.

http://digital.library.unlv.edu/cgi-bin/showfile.exe?CISOROOT=/LV_Maps&CISOPTR=451 — alexantd, Aug 11 '11 at 20:34
JP2K is a VERY cpu intensive format, hence why it is not widely adopted yet even tho' it is a great format (and that also supports lossless compression) — Vinicius Kamakura, Aug 12 '11 at 18:23
@hexa: JP2K was considered to be CPU-intensive 10 years ago, but modern CPUs should eat it for lunch. Kakadu is much faster, for example. — alexantd, Aug 12 '11 at 19:46
You speak as if all computers were quad cores 4ghz machines. — Vinicius Kamakura, Aug 12 '11 at 19:49

score 2 · Answer 1 · answered Aug 12 '11 at 07:27

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ImageMagick has poor perf (pretty good results though). You can consider GraphicsMagick instead. A few interesting benchmarks (there is one for the crop option): GraphicsMagick 1.3.8 vs ImageMagick 6.5.8-10 Benchmark Report

answered Aug 12 '11 at 07:27

Serabe

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sanmai · Answer 2 · 2011-08-15T14:57:39.887

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On a year old Mac mini (2.53 C2D):

$ ls -hn test.jp2
-rw-r--r--  1 501  20    10M Aug 12 23:40 test.jp2

$ time convert test.jp2 -crop 256x256 -format jpg test/%d.jpg

real    0m3.971s
user    0m3.383s
sys     0m0.535s

On a current-model quad-core Mac Pro it should run no slower.

I am using a stock version of ImageMagick from ports:

$ convert -version
Version: ImageMagick 6.6.3-0 2010-08-31 Q16 http://www.imagemagick.org
Copyright: Copyright (C) 1999-2010 ImageMagick Studio LLC
Features: OpenMP OpenCL

Also it is same slow when tiling PNG or plain JPEG. Seems to me that JPEG2000 isn't the issue here.

edited Aug 15 '11 at 14:57

answered Aug 12 '11 at 14:46

sanmai

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can you provide a link to that image? – Vinicius Kamakura Aug 12 '11 at 18:26
Sorry, the image I linked above is not the same as the one I benchmarked. Still, that's way too slow. :( – alexantd Aug 12 '11 at 19:44

Slow performance cropping large JPEG2000 images with ImageMagick/Jasper

2 Answers2