Re: [Gimp-user] Unified Transform issues

[Ofnuts <ofnuts gmx com>]

On 05/31/18 04:43, BWK wrote:
> Good day
>
> I love the new uniform transform tool in Gimp 2.10. I do aerial photo overlays
> and it makes the number of steps needed to bring a different aerial photo over
> the top of an existing one, much faster.
>
> However there have been some challenges which may or may not be an incomplete
> implementation at this time or perhaps some bug in the software.
>
> More than once after completing the preview alignment I have forgotten to click
> the Transform button and gone on to another step and then discovered there is no
> way of getting back to transform. While you are in the transform preview you can
> undo specific steps, but as soon as you have gone out of the transform then
> there is no way of going back into the transform and retrieving it. Looking
> through the undo list none of those transform preview steps are in the undo
> list. As soon as you would accidentally go out of the transform tool it
> evidently just dumps all the individual steps.
>
> I think the transform preview steps need to be included in the undo list all the
> time, not just when you are actually setting up a transform, because it is so
> easy to accidentally click the wrong thing and hey, it's just dumped all the
> stuff you did and you have to start again.
I believe that one of the design  points of the Unified Transform is 
that there is actually one single transform taking place in the end 
which is a Good Thing. All these transforms interpolate pixels and 
therefore slightly degrade the image. In other words the result of 
Scale, then Rotate is not as clean as the result of a combined 
Scale+Rotate, because you interpolate pixels twice in the former and 
only once in the latter.