Legacy ImageMagick Discussions Archive

After upgrading from 6.3.5-3 to 6.4.1-5, saving DPX files has become almost 10 times slower! All of the other file formats I use seem to still be the same speed, though. Has something changed recently?

Here's a sample program:

Code: Select all

int main()
{
	Magick::InitializeMagick( NULL );
	Magick::Image img( Magick::Geometry( 2048, 1556 ), Magick::ColorGray( 0 ) );
	img.depth( 10 );
	img.addNoise(Magick::GaussianNoise);
	time_t ttt = time( NULL );
	for( int c=0 ; c<50 ; c++ ) {
		std::stringstream sss;
		sss << "test";
		sss << c;
		sss << ".dpx";
		img.write( sss.str() );
	}
	printf( "%d\n", time(NULL)-ttt );
	return 0;
}

For Imagemagick 6.3.5-3 this takes 5 seconds. With Imagemagick 6.4.1-5 it takes 41 seconds. I'm using the Windows build, if it makes a difference.

I am having trouble with long delays in converting to GIF. Anyone else?

see viewtopic.php?f=3&t=11388

Timing tests show the majority of the time is spent generating noise. We will have a patch for this problem within the next few days. Thanks.

Sorry, the timing for the above is excluding the noise generation. I just added that in when I was testing something with compressed files and forgot to remove it. The large difference in speed remains even if you remove the noise generation.

We're still investigating but our initial test under Redhat Linux shows that ImageMagick 6.3.5 is slightly slower (19 seconds to write 50 DPX images) than 6.4.1-5 (17 seconds). We'll try the timing under Windows in the next few days.

Legacy ImageMagick Discussions Archive

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