Congratulations on the release. Looks like fun. A (maybe obvious) suggestion: To make the sort of app really fly it helps to make it so that the people viewin

Congratulations on the release. Looks like fun. A (maybe obvious) suggestion: To make the sort of app really fly it helps to make it so that the people viewing the produced images can't avoid knowing the image was produced by Colorify. For instance you could host the produced images on a Colorify site, so that people can see how it was produced (and learn more about the app). They then will be compelled to download the app and make their own images, which act as an advertisement to your app. I agree with hammerdr above that more visual feedback to the user would be good. The part where the image is being converted to B&W would be a good place to start.