Ubuntu – Simplest process to get ImageMagick 7 with PNG support on Ubuntu


I've tried to find a simple explanation for several hours but I just can't seem to find anything useful. I'm primarily a Windows programmer with some experience with Linux-based OSes. For some reason doing apt install imagemagick only gives me a really old version (pre-2012) and there's a change in the later versions that I need, which means I need to build from source.

Compiling IM 7 on Ubuntu 18.04 is simple enough: Download tar.gz, extract, ./configure, make and make install. However it seems that PNG support is not included by default (why??).

I've tried doing ./configure --with-png but that didn't achieve anything (I see --with-png=yes no, which presumably means "yes, you've asked for PNG support but no, I haven't given it to you"). I've seen many forum posts and SE questions about this, but everyone asking seems to have some prior knowledge which I am clearly missing and the questions appear to be about some later step in the process.

So, what do I actually need to do to get PNG support?

(And as some bonus questions: Why is there no documentation for this? Why does it not include PNG support out of the box? Why are there no prebuilt binaries for Ubuntu?)

Related question: Imagemagick still exists after apt remove?

Best Answer

  • I am not sure what error message you were getting, but I was getting convert: no decode delegate for this image format `JPG' @ error/constitute.c/ReadImage/562 when working with jpegs with a fresh ImageMagick install from source.

    To resolve it:

    1. uncomment deb-src http://us.archive.ubuntu.com/ubuntu/ bionic main restricted in /etc/apt/sources.list

    2. install dependencies

    sudo apt update
    sudo apt build-dep imagemagick
    1. Reinstall ImageMagick
    sudo make install
    sudo ldconfig /usr/local/lib

    source: https://linuxconfig.org/how-to-install-imagemagick-7-on-ubuntu-18-04-linux