Legacy ImageMagick Discussions Archive

IM v6.9.5-3 on Windows 8.1.

"identify -ping x.miff" for large miff files is very slow.

f:\web\im>timec %IM%convert -size 7000x7000 gradient: x.png

TimeC c:\im\ImageMagick-6.9.5-3-Q16\convert -size 7000x7000 gradient: x.png
Seconds: 4.28

f:\web\im>timec %IM%convert -size 7000x7000 gradient: x.miff

TimeC c:\im\ImageMagick-6.9.5-3-Q16\convert -size 7000x7000 gradient: x.miff
Seconds: 3.02

f:\web\im>timec %IM%identify -ping x.png
x.png PNG 7000x7000 7000x7000+0+0 16-bit sRGB 118KB 0.000u 0:00.000

TimeC c:\im\ImageMagick-6.9.5-3-Q16\identify -ping x.png
Seconds: 0.03

f:\web\im>timec %IM%identify -ping x.miff
x.miff MIFF 7000x7000 7000x7000+0+0 16-bit TrueColor sRGB 294MB 0.234u 0:00.452

TimeC c:\im\ImageMagick-6.9.5-3-Q16\identify -ping x.miff
Seconds: 4.84

It takes longer to "identify -ping x.miff" than it does to create it!

I've discovered that "convert -ping x.miff info:" works more speedily.

Code: Select all

f:\web\im>timec %IM%convert -ping x.miff info:
x.miff MIFF 7000x7000 7000x7000+0+0 16-bit TrueColor sRGB 294MB 0.203u 0:00.202

TimeC c:\im\ImageMagick-6.9.5-3-Q16\convert -ping x.miff info:
Seconds: 0.45

I don't know why "identify" takes ten times as long as "convert". Even without "-ping", convert is quicker.

Use this command instead:

identify -ping 'x.miff[0]'

Yes, that's better. Instead of 4.5 seconds, it's down to 0.03 seconds. But there's only one image, so it shouldn't make any difference, should it?

Legacy ImageMagick Discussions Archive

Performance ping large miff

Performance ping large miff

Re: Performance ping large miff

Re: Performance ping large miff

Re: Performance ping large miff