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Why does ImageMagick fail with "no decode delegate for this image format `PNG'" even when the png delegate is installed?

I'm working on openSUSE Tumbleweed.

I have ImageMagick installed.

$ convert --version
Version: ImageMagick 7.1.0-52 Q16-HDRI x86_64 20549 https://imagemagick.org
Copyright: (C) 1999 ImageMagick Studio LLC
License: https://imagemagick.org/script/license.php
Features: Cipher DPC HDRI Modules OpenMP(4.5) 
Delegates (built-in): bzlib djvu fontconfig freetype gslib jng jpeg lcms ltdl lzma png ps raw tiff x xml zlib
Compiler: gcc (12.2)

Notice that the PNG delegate is installed, at least according to --version.

Despite this, converting fails.

$ convert covalent_platform.svg covalent_platform.png
convert: no decode delegate for this image format `PNG' @ error/constitute.c/ReadImage/776.
convert: no images defined `covalent_platform.png' @ error/convert.c/ConvertImageCommand/3342.

Even identifying a non-PNG file fails, with the same PNG delegate problem.

$ identify covalent_platform.svg
identify: no decode delegate for this image format `PNG' @ error/constitute.c/ReadImage/776.

Any ideas for what might be wrong here?

I reinstalled libpng-devel and reinstalled IM, but the problem remains.

Solution

  • I figured out the problem, thanks to @fmw42 pointing out that if magick -list format has no output then the installation is bad.

    I had installed IM from https://imagemagick.org/script/download.php

    These downloads are not compatible with openSUSE.

    After uninstalling and reinstalling IM from https://software.opensuse.org/package/ImageMagick, everything works as expected.