On Mar 9, 2011, at 7:09, <[email protected]> <[email protected]> wrote:
>> Re: [Skim-app-users] Crop pdf permanently to reduce file space?
>
>> From: Christiaan Hofman <cmhofman@gm...> - 2011-03-08 16:16
>> On Mar 8, 2011, at 17:04, <[email protected]> <[email protected]> wrote:
>>
>
>>
>> There is no way to change the contents of a PDF. A PDF is a set of drawing
>> instructions, which by itself have no direct knowledge of whether they're
>> drawn in inside or outside the visible page space. It's not a set of pixels
>> where you can simply remove some of them. (Well, the only way would be to
>> turn
>> it into a set of pixels, i.e. an image, crop those pixels, and convert back
>> to
>> PDF. However that will almost certainly increase the file size and decrease
>> the quality.)
>>
>> Christiaan
>
> ----
>
>> Re: [Skim-app-users] Crop pdf permanently to reduce file space?
>> From: jeff newman <bangersandmash@gm...> - 2011-03-08 16:24
>>
>>
>> If you don't have any notes, etc. attached to the PDF you can use the "PDF"
>> menu in the print dialogue to save as a PDF. This will print with your
>> crops. The only catch is that you have to adjust the size of the paper to
>> fit the size of your cropped pages.
>>
>> --
>> Jeff Newman
>
>
>
>
> Hi Christiaan and Jeff,
>
> thank you for your answers.
>
> @Christiaan:
> You're right. I forgot to mention a "small" (but important) detail:
> We're talking about pdf files containing one scanned image per page and a
> text layer created by OCR (DevonThink Pro Office with Abbyy OCR Engine).
>
> So I think theoretically it should be possible to reduce file size "cut off"
> something by cropping the embedded images.
>
> But could there be a way to do that without (manually) exporting the image
> to an external file, cropping there and importing it at the "same" position
> in the cropbox, so that there is no offset regarding the OCR layer?
>
No.
> Most of those pdfs do not contain Skim notes yet.
> If they do, I understand that cropping them without Skim knowing about it
> creates a problem, because the notes seem to be placed with x/y coordinates
> referring to the original page size.
>
That's correct.
> @Jeff:
> I tried that (printing to a pdf), and
> yes, then I can't display the original whole pages in Skim or Preview any
> more (by selecting media frame)
> but no, the file size did not change at all. :-(
>
> Kind regards
>
> Martin
>
That's doing the same as saving with a crop, except that it also changes the
media box.
Christiaan
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