Conversion PDF to PDF/A: very large file!

[mdelbene]

Hi all,
I'm using GdPicture9 and I want to convert a PDF file to PDF/A compliant.
I follow the instructiong in this post: viewtopic.php?t=3663
and everything works.

But I have a problem: the source PDF file has 2247 pages and its size is about 20MB.
After the conversion the new file became 775MB (with rendering 200 DPI)!!!
If I choose 100 DPI the dimension get down to 296MB, but this size is still too high.

There is another way to obtain a converted smaller file?

Thank you all.
Michela

[Loïc]

Hi,

The way you convert PDF to PDF/A is using rasterization. Despite this is basically the only way to be certain to have any PDF document converted to PDF/A this usually increases a lot original document size when it contains vector data.
In latest GdPicture version we offer a color detection plugin that permits to determine the color intent of the page. Using it you can subsequently convert the page to grayscale or bitonal, if any, and use a compression algorithm to obtain the best compression ratio. This approach offers a more reasonable produced document size when input is vector based and dramatically reduces the size when it is raster.

Please let me know if you need further information.

With best regards,

Loïc

[mdelbene]

Hi Loïc,
thank you for your answer.
The file I'm trying to convert is already in black/white, but if you have any suggestions or any sample code to obtain more compression I can try it.

Regards.
Michela