On 2006-08-11, Dean Card <[EMAIL PROTECTED]> wrote: [snip]
> thanks for the reply. I have been able to use the Image.PERSPECTIVE > transform via trial and error to get it to work properly for each transform. > What I am really looking for I guess is a way to calculate the 8 int tuple > to match the perspective change I am going for. For a given image there may > be 5 elements that need to be 'painted' on with perspective. A database > table will include the transform tuples based on the source image. So, by > passing a starting image and a pattern image, the starting image can be > covered with. Perhaps the best way to explain is visually.... > > http://seanberry.com/perspective.png > > What I need to know is how you take a surface like (P1, P5, P6, P2) and > describe it with the 8 int tuple? You could try asking this in comp.graphics.algorithms. The question is easily made non-Python-specific, just say you have a function in a library that does this: Transform each point {x,y} in an image into a new point {x1,y1} where {x1,y1} = {(ax + by + c)/(gx + hy + 1), (dx + ey + f)/(gx + hy + 1)} then ask how to choose the params a to h to achieve the effect illustrated on http://seanberry.com/perspective.png. -- http://mail.python.org/mailman/listinfo/python-list
