'Size,pixels' slider

In the online Help is written :

Global Parameters

The second section (below the separator) shows global parameters which are common for all filters:

Size – scales the entire filter output

My question concerns 'Size'.
I have noticed that I get a very different result when I change the 'Size,pixels' slider. If I have an image that is 6000px wide, and I set the 'Size,pixels' slider to 250, I get something quite different. I can even set that slider to 1.
With some slider values, I even get a kind of 'kaleidoscopic' image, meaning I see the object 4 times, small and partly mirrored. But only with some slider settings. Then if I manually fill in a value that is 0,01 different, the image goes 'normal' again and if I fill in the original value where the 'kaleidoscopic' effect occurred, it does not.
I think this might be a bug.

How should I interpret the 'Size,pixels' slider? What does it actually do?
> Size – scales the entire filter output.
What does this mean?

TheBeat

Quote
SpaceRay wrote : Your questions are good and well done as I also would like to know an answer for this to know why it has some weird behaviour sometimes.

Thanks. And I would like to see a explanation of the mechanism behind this slider.
What does it exactly do. The description of it in the Help is shallow and leaves me guessing.

The Beat

Thanks, emme.

The shrinking seems to depend on the Transform component being used : Transform, Scale or Rotate. You still might be right that the center of scaling is 0,0 and the different Transform components make it seem different. I have to experiment some more to precisely find out. I have not tried other 'distant' components.