On 12/19/06, Francesc Altet <[EMAIL PROTECTED]> wrote:
A Dimarts 19 Desembre 2006 08:12, David Cournapeau escrigué: > Hi, >
<snip>
My guess is that the real bottleneck is in calling so many times memmove (once per element in the array). Perhaps the algorithm can be changed to do a block copy at the beginning and then modify only the places on which the clip should act (kind of the same that you have made in Python, but at C level).
IIRC, doing a simple type specific assignment is faster than either memmov or memcpy. If speed is really of the essence it would probably be worth writing a type specific version of clip. A special function combining clip with RGB conversion might do even better. Chuck
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