[Klug-general] gimp rotation sequence layers duplication

[Thomas Edward Groves]

Because each time it does a rotation it's generating a square image which
completely
contains the previous (now rotated) square.
The clue is in the increasing size.
Of course if someone had sussed that a circular boundary round the original
image
would avoid this then you wouldn't have this problem.
But in that case the original coder would have entered a world of pain
which why no one has ever done it (I think).

Hope this helps.

Tom
----- Original Message -----
From: jwmartnet . <jwm.art.net at gmail.com>
To: Kent Linux User Group - General Topics <kent at mailman.lug.org.uk>
Sent: Thursday, February 04, 2016 11:07 PM
Subject: Re: [Klug-general] gimp rotation sequence layers duplication


> Oh. The last layer is 35370 x 35370 px.
>
>
> On 4 February 2016 at 23:02, jwmartnet . <jwm.art.net at gmail.com> wrote:
> > Hi,
> >
> > Anyone know much about how the gimp does rotation? I started with a
> > small image < 500x500 px, and performed the following procedure:
> >
> > 1) duplicate layer
> > 2) rotate new layer 15 degrees
> > 3) duplicate rotated layer
> > 4) repeat from step 2
> >
> > So I've got around 21 layers now and with each layer the rotation is
> > taking longer and longer, about two minutes - on an i7-4790k @ 4ghz.
> >
> > Yawn.
> >
> > James.
>
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