Re: rendering of boundaries of touching objects

Hi,

This is a known issue with the method of anti-aliasing that these 
renders use. Other anti-aliasing methods can be used but are more 
expensive, i.e. sub-pixel rendering uses more memory etc... The SVG 
working group have decided not to specify how anti-aliasing is done, and 
I don't think they will in the future. This artefact is not wanted, but 
this is a comprise made for performance.

Regards,
Craig Northway

Piers Titus van der Torren wrote:

> When objects touch on a boundary (both object have the same nodes on
> the boundary) and it's rendered antialiased, with the objects filled
> without stroke, the boundary line is visible, it's a bit transparent.
> At least in most renderers it is (Adobe SVG viewer, Batik, KSVG,
> inkscape).
>
> The question is, is this behavior wanted? It seems to me that if
> there's no space between regions there shouldn't be a transparenent
> line.
>
> This behavior is caused by the way transparency works, two shapes of
> 50% opacity don't make 100% opacity, so the antialiased edges keep
> transparent.
>
> I can't think of an easy way to get rid of those lines, but if there's
> need for maybe we should think harder.
>
> For example this is a problem with autotracers like autotrace or the
> potrace based tracer of inkscape, where are transparent lines between
> every shape.
>
> see the attached file for an example.
>