How to speed up resample action!!

[diuming]

Hello guys,

I have a tiff file (pixel: 21503x29003 17.1MB DPI:2400).
I try to resample to 300 DPI, But convert utility almost spend 2 mins.

Does anyone can teach me, how to speed up resample or any idea to improve.

convert -resample 300x300 input.tiff output.jpg

Thanks

Diuming

[anthony]

You are reaching a memory limit and IM is disk caching.

More memory or perhaps use a Q8 version of IM.

A streaming method could also be used.

Really Massive Image Handling
http://www.imagemagick.org/Usage/files/#massive

[diuming]

Thanks for reply..

Yes, My IM is Q8 and I try to use convert command with -limit option, But I got a same result of spend time.

Ram 4G
Disk : 5700 RPM

convert -limit memory 32 -limit map 32 -monitor -resample 300x300 input.TIF -scene 1 +adjoin output.jpg

Diuming

[diuming]

I used -monitor option to monitor IM processing, In load image stage as if never using RAM ( I watched system free RAM)

IM : 6.6.7-0
OS : Mac OS X 10.6.5
RAM : 4G
Disk : 5700 RPM


Does my configure IM is wrong?
./configure --disable-shared --without-perl --without-magick-plus-plus --without-x --disable-opencl --enable-delegate-build --without-bzlib --with-quantum-depth=8 --disable-dependency-tracking

thanks a lot.

[dimkalinux]

In latest version of IM PNG seems to be slow - u can try early version.

[magick]

The PNG slow-down was introduced in ImageMagick 6.6.7-0 but has been fixed in ImageMagick 6.6.7-4, the current release.