Re: Another possible gb.poppler bug?

[gbWilly <gbWilly@xxxxxxxxxxxxxx>]

On Monday, December 1st, 2025 at 20:22, Claus Dietrich <claus.dietrich@xxxxxxxxxx> wrote:

> Am 01.12.25 um 15:48 schrieb gbWilly:
>
>> The file: E16536_PRIME_B550-PLUS_UM_WEB_051420.pdf -> loads internal thumbnails
>> The file: F16866_TUF_GAMING_B460-PLUS_UM_V2_WEB.pdf -> does NOT load internal thumbnails
>>
>> I hope you get this solved as that would make for a great improvement to my pdfviewer.
>
> I am not sure whether I understood. So I have a question:
>
> How do you know for sure, that a PDF file has embedded thumbnails or not? Most of PDFs don't have embedded thumbnails particularly if they are small.

I don't that's just it. I have no understanding of the internals of a pdf file. I only see that if no internal thumbnails are found other pdfviewer show them in an instance and I render them myself and it takes a while for documents with many pages.

I have a 177 page document that opens before I can count to 1 with thumbnails. Self rendering when opening that file means I can count to 3 before it is openen and thumbnails show. If I just open without showing thumbnails is is just as fast as Atril. That makes me suspect they might be there, that's all. Same as with the index pages. I see differences and I wonder why, if they could be a bug or not. Simple as that.

> I am using the same algorithm like you and during development I tested it against a file without embedded thumbnails and file with embedded thumbnails. To make sure that the file has embedded thumbnails I generated it myself with Adobe Acrobat on a very very old Windows VM. In my experience gb.poppler always detected embedded thumbnails reliably

Are you sure most pdf files have no thumbnails as most pdfviewers seem to show them for most pdf files, kind of the other way around.

gbWilly

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