[Klug-general] gimp rotation sequence layers duplication

[Mike Evans]

That's what an exponential curve looks like.  (It is an exponential 
isn't it, rather than some other geometric progression?  It's rather a 
long time ago since I had to bother with that stuff.)  Ever tried the 
game with the rice grains on a chess board?

On 05/02/16 09:09, jwmartnet . wrote:
> 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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