Legacy ImageMagick Discussions Archive

Yes I've read loads of Perl documentation over the 20+ years I've been using it. I still have almost none of it memorized, and if I see an example that's represented as working, I'll typically adapt it into my project as the quicker path. Taking the Crop() example, I was MUCH more troubled by my ...

The following may be a result of my Perl installation. Or, it might be a result of the PerlMagick implementation, but after I finally, recognized the error-checking I'd seen in examples: $x=$image->Crop(someparameters); warn "$x" if "$x"; $image->Crop(geometry=>'100x100+10+20'); $image->[$x]->Frame ...

I meant it in a sense that the target would be "empty" of "meaningful" pixels, which would be overwritten later. (I'll edit.)

I took your advice and visited, and I recall that I'd been there before, hunting for 'blend', but didn't see the forest for the trees. It is exactly--half of--what I wanted: The Definitive List of ImageMagick Methods That Can Be Called From PerlMagick/Image::Magick Code. I still need, though, to ...

Thanks, Fred. That info is possibly going to be a game-changer. I'm trying to open a source PNG file, containing transparent and non-transparent pixels, open an "empty" PNG file as a target (say a dummy file of the same size, filled with 'white') copy/overwrite transparent pixels from the source ...

The BA-SIC missing piece, found by more trial-and-error, was the parameter name '$image=>' before the image name:

There are other image-strings that may be used to create a new image (that is, other than 'xc:red') but I've not found a definitive list of all of them. I have had to rely on running across them in examples. One of the weirder ones I experimented with that worked was: $image->ReadImage('gradient ...

The sticking point is non-intuitive. It is Not Enough to instantiate a new Image::Magick (which happens to be a list of images); it is also NECESSARY to READ at least one Image! And, creating a new Image from scratch is also Non-Intuitively performed by "Reading" something that's non-existent! Add ...

(As I was writing that, I had already forgotten that @snibgo had suggested in another thread to hunt for the mappings in the .XS files. Indeed, as I found examples/prototypes? of PerlMagick methods in "quantum.xs", I also remembered that I had been there before, and that, for example, learning that ...

Backstory: I am approaching ImageMagick, as I gather a number of others' have, via something of a backdoor, insofar as I am a Perl user of some years and have the habit of using Perl modules (.PM) to access advanced functionality about which I don't want to face details. So far my experience with ...

In this example, I am trying to copy the top half/bottom half of two different images into a third, but in fact neither of the CopyPixels() registers (the 4th Write is identical to the 3rd). I'm sure I'm missing something basic because even SetPixel() doesn't work. (Like a "commit" step?) Can you ...

I realized that, having just installed ImageMagick from source and having not removed the compilation working-directory, I had the source to ImageMagick right in front of me! Here's what I did, in Ubuntu Linux: % find ~/ImageMagick-7.0.8-65/ -type f -exec grep -i Colorize\( {} \; -print | grep \.[ch ...

@snibgo https://imagemagick.org/script/perl-magick.php#manipulate lists Method: Colorize() with two parameters, 'fill', and 'blend' Parameter 'fill' corresponds to the command line's 'value': as you say, it appears to be a color[1], but I looked in vain for a parallel for 'blend'. @Fred On the same ...

I've only been able to find one example: blend->'0x20' from a user's comment on a different method. I want to read in an existing PNG image (which has transparency) and make the whole thing transparent. I guess that it should be doable with $image->Colorize(fill=>\@transp_pixelpkt,blend=>string ...

According to my understanding of the documentation (references in the codeblock), it should be possible to create an image from scratch, using all of the attributes named under SetAttribute and to read them back, along with all other attributes under GetAttribute. However, in the following, only ...