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interpolation

Isometric Wall

This script-fu skews an image in order to help to draw walls for isometric projection. It can also scale image with few options (ratio, a second layer with interpolation and opacity)...

For further explanation, see also http://registry.gimp.org/node/25040

You can find "02 - Isometric Wall" in Filters>2D Isometric-Fu>

example:

Isometric Floor

This script-fu turns a "flat" image into isometric image. This helps to draw floors. It can also scale image with few options (ratio, a second layer with interpolation and opacity)...

You can find "02 - Isometric Floor" in Filters>2D Isometric-Fu>

example:

Why is there "a second layer with interpolation and opacity" for scaling?
There is always a first layer without interpolation to try to keep the grain texture. This is practical for stone for example. The opacity of this layer is always 100%.

Interpolation Plugin

This is an interpolation plug-in for the GIMP. It works by doing plane/curve fitting and calculating weighted averages. It takes samples from a grid of pixels from 'known' image areas, trying to fit a plane or a curve to each, and then uses those samples to estimate the 'unknown' image areas.

Upper-left: original image, upper-right: result after interpolation,
lower left: selection (a.k.a. output mask), lower right: input mask

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