Overlay Original PDF?

robc

Is there a built-in way to show the original PDF in an overlay instead of the tilepic? I tried setting " display_version = original" with UniversalViewer and it only threw a not found message.

seth

Use the PDFjs viewer and version original.

robc

Invalid viewer: application/pdf/media_overlay in app/helpers/displayHelpers.php line 3928

So... I'm using Pawtucket v1.7.15. Did I do it wrong?

Also, the docs have a vague reference to use_pdfjs_viewer but I'm not seeing that anywhere. https://providence.collectiveaccess.org/providence/user/configuration/rarelyEdited/media_display.html

robc

I need more help with this. I never figured out how to find the PDFjs viewer or the correct settings.

robc

Does anyone know if there's a pdf.js implementation? Or would I have to supply my own?

monica

I don't know if pdfJS is available on V1.7.15.

Have you tried mirador viewer with original?

robc

monica Can you tell me if there is another version I need to look for? All I have is seth's reply and I couldn't find what he was talking about.

monica

robc You would need version 1.8 (develop branch) or v 2.0 (dev/php8 branch) to get the pdfjs viewer.

If you have those versions, then you would update media_display.conf to have pdf overlay use the pdfjs viewer and original display_version.

Sticking with your current version, in media_display.conf under media_overlay > pdf block, update the display_version = original and viewer = Mirador

robc

I will look into those next, thank you.

If I remember correctly, the Mirador overlay is totally broken in Pawtucket 1.7. I've used tile viewer and Universal with success. Probably just need to try the 2.0 branch.

robc

Tried the Mirador overlay in Pawtucket dev/php8 default theme. It remains totally broken in that branch too. Works great in Providence. I never understood why.

seth

Mirador's stylesheet isn't loaded by default. (we've been considering removing support for Mirador in Pawtucket). I've added some code in the dev/php8 branch to automatically load it.

robc

Thanks I will check it out. I had some trouble loading a specific PDF in Pawtucket with UniversalViewer and pdfjs. PDF page came up but blank. No problem in Providence with Mirador and pdfjs. I wasn't sure if it's a viewer issue or something going on with the ViewerWrapper. Going to experiment when I have spare time.

robc

After a fair bit of debugging, I noticed the console shows one site loading _compressed.pdf media while the other loads _original.pdf

In Providence we have

https://github.com/collectiveaccess/providence/blob/dev/php8/app/conf/media_display.conf

	pdf = {
		mimetypes = {application/pdf},
		display_version = compressed,

So I had customized the Pawtucket configuration on my production site but assumed Providence was already configured to load the original media.

I believe the original PDF in testing will crash pdf.js v2.4, and I confirmed this by updating the Providence conf. This version of pdf.js is quite old and there have been several bugs fixed regarding canvas size and large embedded images. Also note the latest is v4.6.

Reference https://github.com/mozilla/pdf.js/issues/12307

I will add a github issue about updating pdf.js.

seth

The compressed version is a derivative of the original generated by Ghostscript using its built-in "compressed" mode. While the file sizes are much smaller the quality of the compressed is often terrible, or even unusable. Users have asked for it though, so we added the rules to support it. You should be able to switch between the versions as desired, unless your media_processing.conf file lacks the rules for the compressed version. We have had no problems with "original" PDFs crashing PDF.js, but of course behavior is dependent upon the content of the PDFs you're uploading. If they're heavy files with huge embedded bitmaps things PDF.js might not do so well. For the many uses cases we've seen the current (old) version in use has fared well. An update would hopefully cope even better with the PDFs out there.