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Photoshop does not support Touch. It has supports for graphic tablets pens with wintab device drivers. It has support for mice and keyboards. No where do I see touch support documented in Photoshop manual. Here is a link to Photoshop manual search it for touch, http://helpx.adobe.com/pdf/photoshop_reference.pdf The closest thing I found to touch support is the following:
Use the Rotate View tool
You use the Rotate View tool to rotate the canvas non-destructively; it does not transform the image. Rotating the canvas can be useful for any
number of reasons, including facilitating easier painting or drawing. (OpenGL is required.)
You can also use rotate gestures on MacBook computers with multi-touch trackpads.
1. In the toolbox, select the Rotate View tool . (If the tool isn’t visible, hold down the Hand tool.)
2. Do any of the following:
Drag in the image. A compass will indicate north in the image, regardless of the current canvas angle.
In the options bar, enter degrees in the Rotation Angle field. Click or drag the circular Set Angle of Rotation control.
3. To restore the canvas to the original angle, click Reset View.
For a video on the Rotate View tool and other workspace tips, see www.adobe.com/go/lrvid4001_ps. (Discussion of the Rotate View tool begins at the 5:10 mark.)
Disable trackpad gestures (Mac OS)
If you have a MacBook computer with a multi-touch trackpad, you can use the trackpad to flick, rotate, or zoom images. This functionality can
greatly increase your efficiency, but you can disable it if inadvertent changes occur.
1. Choose Photoshop > Preferences > Interface (Mac OS).
2. In the General section, deselect Enable Gestures
My Wacom Intuos 5 Touch device driver has some touch support for some Photoshop features. I do not try to finger paint I use the Wacom pen for that. I also do not get the strange finger paint in Photoshop when I use my finger to move the mouse cursor with the Wacom Intuos 5 touch support. Starting outside an image window or inside one,
However if I add two finger support add tap to click I can finger paint and also use other tools. However I'm not into finger paint so I do not configure Touch support that way for Photoshop.
Okay, that's a bummer... Thanks anyway for your answer!