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1321

answers:

2
+1  Q: 

skew matrix algorithm

I'm looking for skew algorithm, just like on photoshop, edit->transform->skew is there any simple matrix which could do that?

what I've seen so far was basic skew matrix (shear) but its lack of control point, doesn't like on photoshop which have at least 4 points on each corner of rectangle and we can move each control point freely.

I need to implement it to transform a plane.

+4  A: 
Seb  2009-03-23 12:43:02
These matricies are what mathematicians call skew, but based on http://www.offshorewebsolution.com/resources/creating_skew_effects_in_adobe_photoshop.html, I'm don't think it's what Photoshop calls skew.
David Norman  2009-03-23 12:56:40
A: 

See this question on quadrilateral mapping.

plinth  2009-03-23 13:32:56

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