> Am 03.09.2021 um 18:24 schrieb Hans Hagen via ntg-context > <[email protected]>: > > On 9/3/2021 12:28 PM, Henning Hraban Ramm via ntg-context wrote: >> Hi, is it possible to apply geometric transformations to images using >> MetaPost? >> This is again way over my head, but I’m still trying different methods to >> let a ConTeXt document look more “hand-made”. >> In my example*, I added frame and shadow to a photo and _distorted_ it >> slightly to have it look like a postcard was glued on the page (with a piece >> of tape). I’d like to automate and randomize that process. >> I guess I could achieve something similar with ImageMagick (not with >> GraphicsMagick), but if it would be possible inside LMTX that would be great. > the question is not so much if it can be done but how far we should go in > doing things .. so, only as friday afternoon distraction, and because > i wanted to upload anyway (not done yet) i'll meta-imp-magick that uses the > gm lib interface (that only does simple conversions, but i added bur and > noise an dcan add some more if needed as long as there is no weird stuff or > code bloat) > > not in the core, just as 'imp' because we don't want library dependencies > (and the optional libs are lightweight delayed loading ones) > > now, the drawback of course is that one needs gm installed (quite large) but > it does work on my windows box so ...
Thank you! That’s interesting and I can probably use it for a different project, but for what I had in mind, GM wasn’t enough. IM has much more features (and probably also flaws), is even bigger, with more dependencies, but I could install both with MacPorts. I guess it’s on me to write a wiki page about GM. And maybe adapt your code to IM... I just thought since MP is great for geometrical calculations it might also be able to use transformation matrices on images. But since I don’t understand matrix calculations anyway, I’ll live without. Generally, I’d like to delay image manipulation as long as possible – only ConTeXt knows the final size of the used images, and since I want to keep e.g. frames and shadows at the same size for all images I need to calculate with that final size. Hraban ___________________________________________________________________________________ If your question is of interest to others as well, please add an entry to the Wiki! maillist : [email protected] / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://context.aanhet.net archive : https://bitbucket.org/phg/context-mirror/commits/ wiki : http://contextgarden.net ___________________________________________________________________________________
