Legacy ImageMagick Discussions Archive

Hello,

I use ImageMagick a lot in my command line scripts (lots of Linux shell) for automatic processing and format conversion. I would like to develop a filter extension for ImageMagick. What is the best method?

My goal is to add a custom filter just before converting to the output format.

Ex: convert -resize 50x80 -colorspace 'sRGB' -background white -alpha remove -alpha off -trim ... -customfilter "myfilter, myparam1, myparam2" file.eps file.jpg

The filter is an image processing (before conversion to the output format) that is really specific to my job. I would prefer C ++ language but I can adapt another language.

Thank you for your help.

IM has that facility, but the keyword is "-process" not "-customfilter".

A process module can do anything you want. Typically it modifies all the images in the current list, or replaces them all with a single image. I have published some at Process modules. They are written in C, and are linked in to IM when it is built. I expect they could be written in C++ instead.

PS: your command should read the input, do the processing, then write the output.

see also
https://www.imagemagick.org/script/reso ... hp#modules
https://www.imagemagick.org/script/comm ... hp#process\
https://www.imagemagick.org/script/arch ... hp#filters

I thank you for that precise answer. It's perfect, we will be able to realize our filter.