https://bugs.documentfoundation.org/show_bug.cgi?id=150777

--- Comment #10 from Tomaz Vajngerl <qui...@gmail.com> ---
(In reply to V Stuart Foote from comment #7)
> We do keep the original 1bpp image, placing it in the ODF archive's Pictures
> directory.

Yes, the original is available, but you don't put PNG inside PDF - so reading
again would again produce a 8-bit RGB Bitmap. 

> For now though, the resulting PDF is simply larger bcz of embedding an 8bpp
> bitmap into a stream. But do we need to generate PDF with 1bpp images? 

No - I don't think so.

> Other than size of the PDF what is the justification? I guess for "fidelity"
> to the original--but then PDF is a presentation format not an exchange
> format. The 8bpp grayscale will look better than 1bpp. 

It will look exactly the same - no matter if it's 1bpp or 8bpp.

> And in this sample we're working with the full image on document
> canvas--what happens when the original image has been masked, clipped or
> otherwise edited (i.e. image filtered). An 8bpp or 24bpp image is going to
> be required then, right?

If the Bitmap is changed in any way (resized for example), it's converted to
24-bit RGB. If it's just metadata (crop for example) then it depends - not sure
what happens with PDF. 

> So unless this is really easy, then reasonable to => WF

Well, it's an issue, but low priority.

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