[argyllcms] Re: scanin and perspective distortion
- From: Martin Ling <martin-argyll@xxxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Wed, 6 Feb 2008 01:04:03 +0000
On Wed, Feb 06, 2008 at 01:17:11PM +1300, Guy K. Kloss wrote:
>
> The issue is now, that any image distortion that leads to a non-rectangular
> shape of the target potentially endangers the characterisation, as pixels
> outside the patches (or belonging to other patches) will be evaluated. This
> means that the target MUST remain orthogonal towards the visual axis of the
> camera, with only limited pin cushion distortion of the optical system.
The LProf GUI profiling tool (http://lprof.sourceforge.net) allows you
to pick the corners of the chart interactively on an image, and visually
adjust the sizing of the sampling areas. It corrects for perspective
distortion though not pincushion.
I used this to profile my camera some time ago. It uses some version of
Argyll under the hood, so you may be able to use the GUI just to get a
.ti3 file out and then continue with your normal Argyll toolchain.
Martin
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