Compare to: No image crushes PWP

[tomczak]

I was playing with Compare and, while I'm not 100% sure how this setting could be useful, it seems that choosing Compare to: No Image crashes PWP.

[tomczak]

I was testing if Compare to: no image works now - and it does not crash PWP anymore. Thanks!

But there is something strange. If I set No Image at first, I'm getting the gray output, but then if I edit it and change it to compare to some other image AND than back to No image, the output image in the Compare window is ok (gray), but the one in the Browser is one step behind or ghosted.

[jsachs]

There were a couple more issues with computing the final image, when No Image was selected or when switching images, that I fixed in Compare for the next release. The image browser thumbnail is not updated until you click OK or Apply. This is similar to other transformations that have their own previews.