[Klug-general] gimp rotation sequence layers duplication

[john at johnreid.it]

Because of the immense size, would it not be smarter to duplicate and rotate the original layer each time r‎ather than each subsequent, expanded canvas?

‎Alternatively, once the image size starts to slow the system down use Gimp's autocrop function to get the canvas size down to 500px again.

I imagine that rotating a raster image that's 35,000 pixel‎ square (over a billion pixels!) is a chunk of work for any system.

Glad to see the group chatting, by the way!

John

Sent from my BlackBerry 10 smartphone.
  Original Message  
From: jwmartnet .
Sent: Thursday, 4 February 2016 23:07
To: Kent Linux User Group - General Topics
Reply To: Kent Linux User Group - General Topics
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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