[Klug-general] gimp rotation sequence layers duplication

[jwmartnet .]

The extra time wasn't really noticible until the 15th layer or so and
still pretty quick, so I just plodded on with it. Was only in the last
few layers where it really got dragged down.

On 5 February 2016 at 08:30,  <john at johnreid.it> wrote:
> 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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