Legacy ImageMagick Discussions Archive

Do I understand that now:

%[mean] and %[fx:mean] now produce the same global mean from all the channels and the same for min/minima max/maxima etc on the statistics

And to get any channel mean one would now do:

%[fx:mean.r] say for the red channel

If so at what version was this change made -- for my version trapping in my scripts (though this will generally not be a big issue).

In many ways this is nice as then to get the global mean from all channels I can do it in the fx escape and include other calculations. I don't have to do it in two steps getting the global mean from %[mean], storing it in a variable and then using it in a subsequent fx calculation.

Fred

The ChangeLog says:

• 2010-11-08 6.6.5-8 Cristy <quetzlzacatenango@image...>
  * %[fx:mean] is the mean of the default channels (all but opacity) (reference
  viewtopic.php?f=1&t=17432).

So we assume the change was made in version 6.6.5-8.

Thanks. Sorry I overlooked that in the changelog.

Okay. Documentation will need to be fixed to declare channel as being 'unknown', and that the channel value needed for a calculation will need to be declared.