Legacy ImageMagick Discussions Archive

Many thanks folks

Given the increased use of HDR I'd be very surprised if I'm the only one who would benefit from this. Hopefully it's not too tricky a task.

Mike

Thanks for this Snibgo, I ran a similar test on my (Q16) system with similar results. I'm processing "true" HDR images (Dmax around 4.5, 15 or so fstops) which have good and accurate detail in the shadows, therefore this integer rounding is causing me some jip. I understand that lcms2 does work with ...

Hmmmmm,

15,000+ views - surely there must be some constructive suggestions?

Hi, I'm running icc profile conversions on HDR (.exr) images using Q16 HDR IM. The profiles are simple matrix profiles (i.e. not LUT profiles) It appears that running the profile command is mapping a floating point value into a 16bit integer value following icc conversion and, further, is clipping ...

Thanks Fred,

I suspected this. Think I may stay with perl for the moment. Better the Devil you know

Mike

Hi Folks, I've been using PerlMagic for a while now. However, I've recently been using Python for some (non-imaging) work, and would like to start using Python with ImageMagick. There appears to be a number of different wrapper implementations, some of which do not appear to have been updated ...

ImageMagick 7.0.5-5 Q16 x86_64 2017-04-03 - (ImageMagick-7.0.5-5-beta20170402) Thanks folks, this now appears to work :) Just an observation on the implementation: Running the following test code: print $image_a->Get('compose:clamp')."\n"; print $image_b->Get('compose:clamp')."\n"; $w = $image_a ...

My previous post on this topic (some 6 months ago, and when I was much less familiar with IM) has received 3400+ views, so presumably the are a few users out there interested in the same issue!
viewtopic.php?f=7&t=30631

I'd agree. I've tried all of snibgo's permutations and combinations without success. Also it does not seem possible to "Get" the value of any of the default settings.

Wizards - any chance of adding this really useful feature please?

I've tried $get = $image_a->Get('option'), but this returns nothing. Also tried Get('compose:clamp') and Get('option:compose:clamp') but still nothing. In my test, I'm relying on an Identify of $image_a after a compose (which returns values over quantum value) and looking at channel max values. (See ...

Snibgo - Added these to my tests - to no avail :( #$image_a->Set(option=>'compose:clamp=false'); #$image_a->Set(option=>'compose:clamp=False'); #$image_a->Set(option=>'compose:clamp=0'); #$image_a->Set(option=>'compose:clamp=1'); # $image_a->Set(option=>'compose:clamp=True'); # $image_a->Set ...

You should set an artifact instead of an option. Not sure how you can do that in Perl though. Me neither !!!!! How would you call that in magic.net? I could then search for it in the Perl Q16HDRI.xs file. The Set option command in perl calls DefineImageOption, which is - DefineImageOption ...

Hi, Version: ImageMagick 7.0.5-3 Q16 x86_64 2017-03-16 HDR I'm still having issues getting perl magick to switch off the compose:clamp option. I've tried a number of options, to no avail. Using $image->Set(option=>"compose:clamp=off") should, I think, work since that option in PM calls ...

Thanks Snibgo, On Issue one - your response was my understanding as well. However I am getting DIFFERENT output results when using the perl equivalent of -colorspace when the same file has an icc profile and when it does not have an icc profile. You would expect the result to be the same, but they ...

Thanks folks. This is working for me now