If we make it onto a video then the app will be a lot more impressive than we planned it to be This is our first app so it's proof of concept stuf and a lot of learning more than anything else. It will be nice if we get some decent sales, but there is an end in itself in producing this.

So it seems that gimp's overlay is more like a soft light layer, but soft light doesn't duplicate it in photoshop as it really desaturates the image. I tried to use the overlay layer as a greyscale layer instead with the colour layer (that had been set as normal) now as a colour adjustment layer over the greyscale layer. That had the same effect (more or less).

Any ideas?