[ubuntu-art] Inkscape export and resizing

[Chris Tooley]

This is probably something completely different from this discussion, but
it's something I think might be helpful...(maybe everyone already knows
this)

If you're working on something at 16x16 pixels, and output to 16x16, the
antialiasing looks better depending upon the dimensions of your vectors and
where you place them.

For instance, I can draw a box in a 16x16 working area 15 pixels wide, and
center it, but the edges will look like crap - even though it's a straight
line, the antialiasing will blur the lines - due to the 15 pixel box being
defined on "half pixels".  However, if I draw a 14 pixel wide box and center
it, then the icon is much cleaner.

i.e. at 16 pixels, with a 14 pixel box, there is a well defined pixel on
either side. So I get a clean white full pixel, instead of being half a
pixel, which inkscape then proceeds to "dirty" up with it's valiant attempts
at antialiasing.

One could conceivably apply similar thoughtfulness to other vector/image
size combinations in order to suppress "dirty" pixels.

Hope I'm not blowin' smoke!
~Chris

On Tue, Apr 7, 2009 at 9:43 AM, Oliver <scholli_tz at yahoo.de> wrote:

> Am Dienstag 07 April 2009 17:23:00 schrieb Thorsten Wilms:
> > Hi!
> >
> > Some say that higher quality output can be obtained by exporting from
> > Inkscape with the desired size x a-power-of-2, e.g double, fourfold or
> > eightfold.
> >
> > It seems that is the case, but not always.
> >
> > I did an experiment with just black text on white:
> > http://www.piccdrop.com/images/1239116989.png
> >
> Inkscape-Bitmapexport (180dpi) and resize it with gthumb is always the best
> result. It's a harmony between sharp and smooth and craps better with one
> colour to the next one. Think this is an argument for this method. Only
> Inkscape in Bitmapexport fails a little bit in round things (light smooth
> is
> missing).
>
> Oliver
>
> > The GIMP and gThumb examples are scaled down from an Inkscape export of
> > eightfold size, using Cubic interpolation in GIMP and "High-Quality" in
> > gThumb, which is likely to be cubic, too.
> >
> > For the difference images, I used GIMP's Difference layer mode. The
> > gThumb/GIMP difference is not entirely black, there are pixels with a
> > minimal value, but visually, this difference is pretty much
> > non-existent.
> >
> >
> > I would like to see suggestion for how to get the worst case for
> > Inkscape, where this method could shine the most.
> >
> >
> > --
> > Thorsten Wilms
> >
> > thorwil's design for free software:
> > http://thorwil.wordpress.com/
>
>
>
> --
> ubuntu-art mailing list
> ubuntu-art at lists.ubuntu.com
> https://lists.ubuntu.com/mailman/listinfo/ubuntu-art
>
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