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Re: Image transformations
From: |
Alan Third |
Subject: |
Re: Image transformations |
Date: |
Wed, 12 Jun 2019 23:15:32 +0100 |
User-agent: |
Mutt/1.12.0 (2019-05-25) |
On Wed, Jun 12, 2019 at 11:07:46PM +0100, Alan Third wrote:
> > > + tx and ty represent translations, m11 and m22 represent scaling
> > > + transforms and m21 and m12 represent shear transforms.
Having written a huge tract and messed around with outputting various
transform matrices, it seems clear to me now that the above is not
quite as straightforward as I was thinking. A 90 degree rotation
followed by a resize doesn’t actually put anything in m11 and m22, so
clearly m11, m12, m21 and m22 interact in mysterious ways.
My feeble excuse is that I’m not a mathematician.
--
Alan Third
- Image transformations, Eli Zaretskii, 2019/06/11
- Re: Image transformations, Alan Third, 2019/06/11
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- Re: Image transformations, Alan Third, 2019/06/12
- Re: Image transformations,
Alan Third <=
- Re: Image transformations, Alp Aker, 2019/06/13
- Re: Image transformations, Eli Zaretskii, 2019/06/13
- Re: Image transformations, Alp Aker, 2019/06/13
- Re: Image transformations, Eli Zaretskii, 2019/06/13
- Re: Image transformations, Alp Aker, 2019/06/13
- Re: Image transformations, Eli Zaretskii, 2019/06/13
- Re: Image transformations, Richard Copley, 2019/06/13
- Re: Image transformations, Eli Zaretskii, 2019/06/13
- Re: Image transformations, Alp Aker, 2019/06/14
- Re: Image transformations, Richard Copley, 2019/06/14