The color management problem gives me a headache! There are many difference between versions and versions of Imagemagick.
In my environment, your PDF is changed too bright!!
Can you tell me which version and convert way you are using? ( See the bottom of the plugin preference page.)
I am using ImageMagick 6.7.2 with exec function.
Great. Now the plugin is not generating the thumbnails properly. Same server, same settings, sister site (UK version). I uploaded a revised PDF and no thumbnail generated. I tried to regenerate and got the following:
http://www.cogsdill.co.uk/wp-content/uploads/Capture-6-27.png
swirv
Hi swirvbox.
I tried to improve the process of color conversion. Try latest version.
https://downloads.wordpress.org/plugin/pdf-image-generator.1.4.6.zip
But, unfortunately, ImageMagick has colorspace problems from CMYK. Especially the older versions are hard to work.
If you are using the server that allows to install newer ImageMagick versions, It is the best way to resolve this issue. For many users who are using hosting service, this is an uncertain way.
In my experience, imagick PHP extension is usually better to convert colors. This is a practical solution and I recommend it.
Thank you.
p.s.
Older imagemagick has a problem with converting to “png” file. It also may affect this issue.
Find “Select Generated Image File Type” in the preference page, and check the radio button for “jpg”.
