Sorry, can't attach the layered ASP file here. Here is a side-by-side of what happens when you merge. Top layers were "hard light" and "add". Even having an empty "normal" at the bottom didn't make any difference (in Photoshop it does). You can certainly try it yourself.

I wasn't talking about natural moving. I was referring to the bug, when reference point doesn't stick where defined, but moves to the tip of the pencil the moment pencil touches the surface. It doesn't happen when it's selected with the pencil (but it's hard, since app doesn't recognize long pencil press as clone reference selection).

1. Most people most the time use both hands while doing it digitally.
2. If one is affraid to accidently touch it, it can be removed. Nobody is painting in the bottom low corner without moving it to the center.
3. We already use enough gestures. Zoom and rotate are crucial, the rest are not.

Solved it. It goes away if you turn on the offset in prefs and specify 0,0 offset.

I know it's an old and tired topic, but I'm just interested to know why mobile device artists (and developers consequently) prefer all those double and triple taps, tap-and-hold and other finger acrobatics of a performing piano player to a simple programmable ALT key. There are SO MANY THINGS can be solved by having it somewhere in the bottom left corner. Turning a brush into eyedropper or eraser, or smear brush would be the most obvious choices for those who work with two hands. Not very useful if you hold your iPad in your other hand though, but you can sure lay it down on your lap or afford a $20 mini stand. Haven't seen any app developer using it. Except, perhaps, for the Paintstorm. A powerful app, with interesting UI ideas, that, like many others, disappeared into the bug-infested heap.

Thanks!

I wasn't talking about some sophisticated image analysis algorithms. Just posterize it to the user specified # of colors, then turn them into a palette. Similarly with pixelation.