Il 26/11/2010 12:21, Geert Janssens ha scritto:
For good print results the more image detail available the better. Our on-
screen process limits images to 510 pixels for comfortable viewing on small
screens. For this reason, many screenshot are resized to fit this 510 pixel
constraint. This means the images are also resized before they are put into
pdf, or in other words they have less image detail than they could have, which
reduces the print quality.
So I would propose to no longer resize the original screenshots in the
documentation source, but do the resizing only as part of the on-screen (html)
output production when needed. This can be easily done with forementioned
imagemagick.
This would give us the best in both worlds: better quality images for pdf and
images that still fit the limited space requirements in html.
Totally agree on this. I don't know how for example the gnome help
maximum width of 510px will be handled.
We'd have to double-check if this added dependency is ok on all platforms of
course. I know it's is readily available on all distributions, and there is a
Windows binary we can download straight away. There is also a macports binary
available on OSX, but I'm not sure if that would be sufficient for John's
native Quartz build or the fink build. But I found that on OS X the native
command line utility sips [1] could be used to achieve the same thing.
So we need only to choose in what dimension print images in PDF and set
a ppi to all figures.
From an unrelated project I did yesterday in Scribus, I learned that Scribus
issues a warning if the resolution of images is less that 144dpi when
exporting to pdf. So apparently, 144dpi is some generally accepted minimum to
have a decent print quality. I propose to use that as ppi voor all images that
don't have a higher ppi set already.
Generally I heard that one of the most used dpi is 300. But that will
probably give too small images in pdf. So I think that 144dpi could be a
starting point. I will experiment with this setting and eventually I
will update all the images in guide and help if you agree.
Regards
Cristian
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