How to scale an image RATIOnally?

[neverwind]

(07-26-2018, 11:31 AM)rich2005 Wrote: If you need a 'logarithmic' type of scaling there might be a plugin - don't know of one.

Using standard Gimp 2.10 tools, no easy way that I know of. My thoughts.

Progressive scaling in sections.

Start with this, Canvas is resized to accommodate the extra width. Selection of the outer '2 strips' Throw in some guides as required. screenshots: https://i.imgur.com/EjGRYpi.jpg

Scale the the selection 200 % https://i.imgur.com/tysiWzD.jpg and anchor it

Select the now resized outer strip and scale 150% https://i.imgur.com/l9yIBia.jpg  Anchor it

Repeat on the other side. All very tedious.

Thanks, Rich. That's exactly what I need to achieve, but then again...without actually doing it manually