Legacy ImageMagick Discussions Archive

Hi, I'm using Perl Magick IM V7.0.5-3 Q16 x86_64. I've been playing around with icc profiles and have come across a couple of potential bugs/enhancement requests. I'm not sure if it's protocol here to separate out each issue (let me know if it is), but have grouped them together into this single pos...

I've now updated to : ImageMagick-7.0.5-3-beta20170315 All Max, Min & Mean values from identify and fx: commands now appear to give correct values. Means give mean of RGBA with alpha "on" and mean of RGB with alpha "off" - which suits my needs just fine :) Fred - I have not c...

I thought I recalled reading something along those lines (opacity the invert of alpha). However, the test results I'm getting don't look like that's the issue. The "o" channel seem to be a duplicate of the "overall" statistics rather than the opacity values. ....... nearly there :)

Hi, Updating IM to HDR ImageMagick 7.0.5-2 Q16 x86_64 2017-03-10 Beta appears to solve the NaN issue. However, the fix appears to have introduced a problem with the xyY -> XYZ conversion on the X channel, which was not there before. Doing a round trip RGB->XYZ->xyY->XYZ->RGB gives the following valu...

:oops: Oooops - I stand corrected (it's been a long day). From my tests, the fx:maxima, fx:minima %max & %min fx:mean & %mean functions (giving values across all channels) now seem to be operating correctly, giving values for all 3 channels (RGB) when alpha is off and 4 channels when alpha i...

Eureka :) :) I've installed Beta version: ImageMagick 7.0.5-2 Q16 x86_64 2017-03-10 and all the issues seem to have been resolved. Many thanks for your work wizards :D. All the fx:maxima, fx:minima & fx:mean are giving the correct results on all channels. I note that the "o" (overall c...

A further observation (which may help in tracking down this bug) is that calling an fx:mean.g causes Identify to stop working correctly. Using: HDRI - Version: ImageMagick 7.0.5-1 Q16 x86_64 2017-03-05 By way of example # Load in image my $image = Image::Magick->new; open(IMAGE, 'r.png'); $image->Re...

I think it would be sensible for the XYZ -> xyY conversion for the 0,0,0 XYZ situation to be mapped (as suggested by Lindbloom) to Y=0 and xy to be set to the whitepoint chromacities for the file (I'm not using sRGB, but ProPhoto and ACES which have different white point chromacities). I still haven...

Also, think it's purely coincidence that red and green max/min values are correct. My figures suggests they are currently reflecting the overall max/min (which, in your example, coincidentally is also 1 & 0).

I'm using HDRI Version: ImageMagick 7.0.5-0 Q16 x86_64 + Perl Magic + Linux.

Fred, I think there are still a few incorrect values even in your example ! For example, the blue channel should have a max of 0.75 and a min of 0.25. Your example above is giving 1 & 0 respectively. I think the max/min for individual channels is now reporting the max/min of all channels. Regard...

Hi, Test code used my $image = Image::Magick->new; my @pixel; open(IMAGE, 'r.png'); $image->Read(file=>\*IMAGE); close(IMAGE); $image->SetPixel(x=>30, y=>30, color=>[0,0,0]); $image->Set(colorspace=>"RGB"); @pixel = $image->GetPixel(x=>30, y=>30); print "RGB - $pixel[0] $pixel[1] $pix...

Hi again. I've now updated to v7.0.5.1. Unfortunately it still appears to be giving incorrect values :( The Statistics() function in perl (which was fixed in v7.0.5.0) now does not function. The values from the RG&B channels are now wrong. The alpha channel does, however, give the correct result...

Thanks again wizards

Thanks snibgo - I'll give that a go