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Re: Backend and non-backend (was Re: Stencil bounding box)
From: |
Johannes Schindelin |
Subject: |
Re: Backend and non-backend (was Re: Stencil bounding box) |
Date: |
Tue, 2 May 2006 21:29:39 +0200 (CEST) |
Hi,
On Tue, 2 May 2006, David Feuer wrote:
> On 5/1/06, Johannes Schindelin <address@hidden> wrote:
>
> > You cannot just compare PNGs. The really important information is: where
> > is the object, not: what color is that pixel. Just think about the
> > consequences of a small adjustment of the position. The difference of the
> > PNGs is potentially quite large, even if the difference of the location is
> > quite small.
>
> I'm not convinced. What if you apply a slight blur to both images and
> then subtract them?
No.
The thing is that you don't know what caused the difference when just
subtracting them. For example, it is an error if a half note is printed
instead of a quarter note, but the difference can be smaller than if the
quarter note is shifted (for example to avoid a clash).
Hth,
Dscho
- Re: Backend and non-backend (was Re: Stencil bounding box), (continued)
- Re: Backend and non-backend (was Re: Stencil bounding box), Han-Wen Nienhuys, 2006/05/02
- Re: Backend and non-backend (was Re: Stencil bounding box), David Feuer, 2006/05/03
- Re: Backend and non-backend (was Re: Stencil bounding box), Han-Wen Nienhuys, 2006/05/04
- Re: Backend and non-backend (was Re: Stencil bounding box), Johannes Schindelin, 2006/05/04
- Re: Backend and non-backend (was Re: Stencil bounding box), David Feuer, 2006/05/04
- Re: Backend and non-backend (was Re: Stencil bounding box), David Feuer, 2006/05/04
- Re: Backend and non-backend (was Re: Stencil bounding box), Johannes Schindelin, 2006/05/04
- Re: Backend and non-backend (was Re: Stencil bounding box), Han-Wen Nienhuys, 2006/05/04
- Re: Backend and non-backend (was Re: Stencil bounding box), David Feuer, 2006/05/04
- Re: Backend and non-backend (was Re: Stencil bounding box), Johannes Schindelin, 2006/05/04
- Re: Backend and non-backend (was Re: Stencil bounding box),
Johannes Schindelin <=
- Re: Backend and non-backend (was Re: Stencil bounding box), Han-Wen Nienhuys, 2006/05/02