Featured Image for mla_viewer

Thank you for your question and for your patience while I was travelling.

I am currently working on a new mla_viewer feature to restore the thumbnail images for PDF documents, and this new feature includes the “Featured Image” support you’ve seen in the earlier support topics:

mla_galery thumbnails are too small.

Manual Thumbnails for PDFs?

PDF Thumbnails Gone

The new features are not included in the current MLA version (2.02); you can download and work with the Development Version to use them until my next official version.

You can find step-by-step instructions for using the Development Version in this earlier topic:

MLA errors when using plugin

I will leave this topic unresolved until the new features are released in the next MLA version. If you get a chance to try the Development Version, let me know if it meets your needs. Thanks for your interest in the plugin.

I have released MLA version 2.10, which contains the mla_viewer support this topic requires. Please note that the new viewer requires Imagick/Imagemagick and Ghostscript to be installed on the site’s server.

I am marking this topic resolved, but please update it if you have any problems or further questions regarding thumbnail generation for PDF documents.

Thanks for the kind words and for your question.

Ghostscript is the software that converts PDF and Postscript files (or a specific page in the file) to an image file in JPG or PNG format.

Imagemagick is the software that processes image files to resize them, compress them and so forth.

Imagick is the software that makes Imagemagick accessible to PHP programs; a connector between Imagemagick and PHP.

All three components must be installed for the mla_viewer thumbnail generation to work.

You can find some installation help here:

Nothing but error messages

WordPress, by the way, will also use Imagemagick for its own image-processing features if it is present. For more information:

WP_Image_Editor is incoming!

Class Reference/WP Image Editor

WordPress Image Editing Tutorial

Thanks for your questions.

Regarding Imagick, it is not part of Imagemagick. Their web site says:

IMagick is a native PHP extension to create and modify images using the ImageMagick API. Documentation for the extension is available here.

I remember having a terrible time finding a compatible Imagick implementation for my (Microsoft Windows) development system.

When I first asked my production hosting company about support I was told:

You can add a php.ini file to your account and add the following line to it

extension=imagick.so

If the modules are not available on your particular server we can see about adding them but will need to be evaluated by an administrator.

After I created a php.ini file with the above line, it still didn’t work. I reported that and they fixed it.

So, you may have to create/edit your php.ini file to bridge the gap or get some other assistance from your hosting company. Do you know how to get the phpinfo configuration listing for your site? That would tell you if Imagick is present.

Regarding the Featured Image issue, I have just run a quick test on my system and (of course) the Featured Image shows up even if I am not logged in. I know of at least one other mla_viewer user that uses Featured Images without this problem.

MLA uses a standard WordPress function, <a href="https://codex.ww.wp.xz.cn/Function_Reference/get_the_post_thumbnail">get_the_post_thumbnail()</a>, for this feature. That function takes a $size argument, which comes from the size shortcode parameter. You can try adding size=medium or size=full to your [mla_gallery] shortcode or verifying that “thumbnail” is in the registered size array for the image. As an experiment, you can also assign the image as the Featured Image for a post or page and verifying that it is working for them. Make sure your theme supports Featured Images as well (most do).

If you can try those experiments and tell me the results I can be more specifically helpful. I regret the trouble and I thank you for your understanding and patience.