Straighten your image before Gimp

[ESH]

I worked with a large file in Gimp 3.2 RC1 - 6000 x 4000 pxxpx (not nice to Gimp but experimental).

Then I decided to straighten 5 layers 1.59 degrees clockwise around the center.

Shortly after I regretted not to have saved the image right before initiating the rotation (the current version could be a number of important steps old, so I decided to let the rotation in progress run). For the same reason Task Manager was not an option.
The rotation with the default Cubic interpolation took 1.5 hours!

Is anybody aware of - if I did something wrong? If so, how can this be done at a normal execusion speed - like at most 1 second in my old Photoshop CS5?

Is any plugin available for such manipulations?

I am of course a beginner with Gimp - and despite this waste of my time a kind of affection is developing. At least this product is open and free

[rich2005]

1 second in PS CS5 is very impressive. Is that using a psd file ?

Not as good in Gimp 3.2 RC1 but nowhere near one-and-a-half hours. A big image, c. 8000x13000 pix with layers 32 bit and initially about 6 GB in memory. Two minutes example: https://sendvid.com/vu577ftk (This is as good as watching paint dry but in real time.)

That is a linux appimage. Maybe a Windows thing ?

[ESH]

(1 hour ago)rich2005 Wrote: 1 second in PS CS5 is very impressive. Is that using a psd file ?

Not as good in Gimp 3.2 RC1 but nowhere near one-and-a-half hours.  A big image, c. 8000x13000 pix with layers 32 bit  and initially about 6 GB in memory.   Two minutes example: https://sendvid.com/vu577ftk  (This is as good as watching paint dry but in real time.)

That is a linux appimage. Maybe a Windows thing ?

Nice movie, Rich
Your result is absolutely within the limits of my ability to stay sane while learning Gimp.
Did you select more than the background layer?
I selected all 5 layers, and a couple of them were totals.
Maybe that makes the procedure repeat the same process 4 times more than needed - or add all the pixels up to a monster?
At the other hand would it not be smart enough to avoid that...

The 1 second claim was reckless. My PS CS5 is long gone as Adobe insisted on having it's monitoring system loaded on my PC while I utilized an old lifetime license. So Adobe was totally cleaned out for more than a year ago, except for the DNG-converter, which seems to be harmless.
So, my claim was based on an inner video showing PS straighten an PSD with many layers while I turn away for a sip of coffee, not for more than 5 seconds...

[rich2005]

(43 minutes ago)ESH Wrote:

(1 hour ago)rich2005 Wrote: 1 second in PS CS5 is very impressive. Is that using a psd file ?

Not as good in Gimp 3.2 RC1 but nowhere near one-and-a-half hours.  A big image, c. 8000x13000 pix with layers 32 bit  and initially about 6 GB in memory.   Two minutes example: https://sendvid.com/vu577ftk  (This is as good as watching paint dry but in real time.)

That is a linux appimage. Maybe a Windows thing ?

...snip...
Did you select more than the background layer?
I selected all 5 layers, and a couple of them were totals.
...

Not much difference whatever you do. Image -> Transform with base layer select or Layers -> Transform with all layers selected.

I did try and make worst possible case, 32 bit precision and all layers (except text) image size.