How to store Bitmaps as JPEGs

[ja...@printtapp.com]

Currently I generate a new PDF by rendering the old one to a bitmap and applying some transforms / other effects.

This causes the new image to be a decompressed image object when the original content was a decompressed JPEG.

Is there a way to get PDFium to re-encode it as a JPEG when needed ? Some documents balloon from 300kb to 10MB

[Dan Sinclair]

I don't know of any API to do this at the moment. Something will need to be added, thank you for filing a bug on the issue.

dan

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[ja...@printtapp.com]

So after some digging the only way currently is to read the buffer for the bitmap, use libjpeg directly to create a new compressed JPEG either in disk or memory.

Load that JPEG into PDFium using it's APIs (Which presumably means you will have the same image in memory 2 - 3 times), attach it to a page object like normal and then save it.

PDFium seems to keep track of the fact that image came from a JPEG and so the final PDF will have a JPEG in it.

Will do some more digging to see if this is compressed or not.

On Tuesday, January 30, 2018 at 2:16:49 PM UTC, Dan Sinclair wrote:

I don't know of any API to do this at the moment. Something will need to be added, thank you for filing a bug on the issue.

dan

On Tue, Jan 30, 2018 at 8:25 AM, <ja...@printtapp.com> wrote:

Currently I generate a new PDF by rendering the old one to a bitmap and applying some transforms / other effects.

This causes the new image to be a decompressed image object when the original content was a decompressed JPEG.

Is there a way to get PDFium to re-encode it as a JPEG when needed ? Some documents balloon from 300kb to 10MB

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