In
#1707176: Black PDF Preview generated with some PDFs →
, we introduced the usage of the -alpha. The option was added to ImageMagick 6.3.5-7 (released 2007-08-14). Currently, we don't check for the IM version, which cause error preventing usage of the module with older IM installation.
Implement hook_requirements to check for IM version. Alternatively, check for the IM version when adding the -alpha flag, and revert to the previous used method when not supported.
ImageMagick error 1: convert: unrecognized option `-alpha'
Getting this error when trying to use PDFPreview to generate an image of page 1 of my PDF. I am guessing that the Imagemagick running on my hosted server is the wrong version or wrongly configured.
What version do I need? Other solutions?
Closed: outdated
2.1
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
17 years later I think we can probably close this. The last release in the 6.3 series of ImageMagick was in 2008 and the last 6.9 release was in 2022. That said, if there are issues with other options we're using we could potentially look at providing a minimum supported version and implement hook_requirements. But for now this can be closed.