no sub-pixel areas in measure-tool?

[Tim de Wit]

hi,

I just noticed that the Measure tool doesn't seem to handle sub-voxel
regions that well.. E.g. if you select 0.5 pixel (triangle), the
measurements are the same as for the full pixel. The same thing seems to
apply to all diagonal lines (also the ones occuring in polygon/freehand
selections!). Am i doing something wrong, or is this a bug?

thanks, Tim

[Gabriel Landini]

On Friday 19 January 2007 14:56, Tim de Wit wrote:
> I just noticed that the Measure tool doesn't seem to handle sub-voxel
> regions that well.. E.g. if you select 0.5 pixel (triangle), the
> measurements are the same as for the full pixel. The same thing seems to
> apply to all diagonal lines (also the ones occuring in polygon/freehand
> selections!). Am i doing something wrong, or is this a bug?

I think (but not sure) it is a feature.

How does one capture 0.5 pixels with a camera/scanner?

Cheers,

Gabriel

[Tim de Wit]

You don't acquire half pixels indeed, but you might want to take them into
account for increased accuracy. If it's really a feature, then why allow
diagonal lines in selections? This way it's a bit misleading..

-Tim

[dscho]

Hi,

On Fri, 19 Jan 2007, Tim de Wit wrote:

> You don't acquire half pixels indeed, but you might want to take them into
> account for increased accuracy. If it's really a feature, then why allow
> diagonal lines in selections? This way it's a bit misleading..

And what exactly should "Fill" or "Draw" do with such selections? Color a
half pixel?

Remember, selections were introduced for those operations first, "measure
area" is a second class citizen.

Ciao,
Dscho