[Scribus] Bitmap images ("au trait")

David Purton dcpurton
Thu Jan 5 13:42:14 CET 2006

On Wed, Jan 04, 2006 at 01:23:57PM +0100, Le Tigre wrote:
> Hi everybody,
> I had a question today on IRC about images "au trait" (ie bitmap images 
> ie B/W only, no grey).
> My problem was: I have some images like that (e.g. barcode, or drawings) 
> and I need them to be perfect B/W when I export them in pdf (because if 
> theye are exported like grey-images, the printing make some little 
> points all around the pictures, meanwhile we'd like a perfect black).
> The solution is:
> - in Gimp, use indexed-color, black-and-white.
> - the resolution must be (it's always like that with bitmap images) 900 
> dpi min. (and not 300 dpi, which concerns grey-images)
> - you can save them in tif
> - in Scribus, import the images - it says that the images are in RVB, 
> but it doesn't matter
> - when you export the PDF, take care about the option "Resamples 
> images". You must uncheck this line: because it's that option that 
> transform 900dpi-bitmap in 300dpi-grey, and make appear those little points.
> It seems perfect to me. Tell me if you see some problems with that.
> And thank you to mrdocs and pjrm on the chat this morning.

It would be nice if gimp had proper bi-level support, actually. I tend
to save as an indexed image from gimp and then convert to a bi-level tiff
using image magic (convert). You get better compression this way.

The handling of these from scribus to pdf is definitely buggy in 1.3. I
haven't looked closely at what scribus is doing but the background comes
out grey...

At present I have been going to EPS then to PDF, but this is no good if
you want fonts included (instead of outlines) obviously.



David Purton
dcpurton at chariot.net.au
For the eyes of the LORD range throughout the earth to
strengthen those whose hearts are fully committed to him.
                                 2 Chronicles 16:9a
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