Re: gEDA-user: improve PNG output quality

[Peter Clifton <pcjc2@xxxxxxxxx>]

On Mon, 2008-10-20 at 13:46 +0200, Duncan Drennan wrote:
> > You could increase the size of the png from the export dialog box
> > (bottom left corner), allowing greater detail in the file.
> 
> I had already tried that, but I still wasn't happy. In the end I
> output to an EPS file, converted to a PDF, imported into Inkscape,
> scaled up a bit and exported to a PNG.
> 
> It is a bit round-about, but the quality when I insert it into an
> openoffice document is now okay.

The quality would be better if the schematic embedded into the
openoffice document were in some vector format. I can't remember exactly
which vector formats openoffice will load, but I don't remember it
importing SVG last time I tried. I think there is an importer now, but
I'm not sure how good it is.

The scaling algorithm employed is important, so if you export at
high-res, then shrink down in openoffice, it will probably look bad.
Some fine lines are lost in the scaling, or everything will be blurred,
depending on whether a "nearest", bilinear or cubic scaling is used.

The scaling options I suggested for gimp would do better at preserving
the quality, but you'd still need to be careful that when inserting the
result in openoffice, further scaling doesn't end up spoiling things
again.


-- 
Peter Clifton

Electrical Engineering Division,
Engineering Department,
University of Cambridge,
9, JJ Thomson Avenue,
Cambridge
CB3 0FA

Tel: +44 (0)7729 980173 - (No signal in the lab!)



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