Legacy ImageMagick Discussions Archive

Hi,

I am using the ImageMagick C++ API.
I try to differentiate the Color/Black & White image as the description in this link:
http://www.imagemagick.org/Usage/compare/#type_general

So, in Code:
Magick::Image source( "color.jpg" );
Magick::Image image = source;
image.type( GrayscaleType );
source.compare( image );
source.meanErrorPerPixel();
source.normalizedMaxError();
source.normalizedMeanError();

However, all meanErrorPerPixel, normalizedMaxError, and normalizedMeanError return zero.

The comparison seems working if replacing the line "image.type( GrayscaleType );" with "image.solarize();"

So, what happened? and how to make it work?

Thanks!

The problem is that the colorspaces differ (RGB vs. Grayscale), however for this special case it should compute the error. We will add a patch to ImageMagick-6.3.5-7 Beta by tommorrow.

Hi,

I downloaded and compiled the latest ImageMagick-6.3.5-7 Beta code.
I am getting the same result. I wonder if the problem hasn't been fixed?

Thanks!