I think the resulting image is over 300meg, but you only need to resample back to original affter using the effect. Here is an example where I resampled the image. This takes a lot of memory, and slows things down, but if your selected area does not have enough pixels, then no zoom is possible. Before selecting, you have to resample the photo to larger number of pixels. Gonna try that when time permits it thought)

In one of the tutorials the iwarp tool is used to merge/fit on symbols on clothing. (I just have a distraction here I saw an example of use for this in the magazine Advanced Photoshop #46. No enlargement when dialogue window is resized either. To get zoom one need to select the area to work on. the preview seems to need just so many pixels. You can only zoom just so much, and then no more. Originally posted at 12:11PM, 15 August 2008 PST It seems I'm going to have to do a video tutorial using this tool.

If you don't select using a box the area you are interested in, then iwarp will give you a preview of the entire photo, and the preview is small and makes it very difficult to do fine detailed work. All you need to do is use the box select tool first, select the working area, that is the total area that will be affected by the iwarp.

I have found a workaround in order to do fine work such as eyes, nose, or small areas. Anyone who has tried the iwarp has found that the preview leaves much to be desired for doing fine work.

Iwarp gimp 2.10