sikuli-driver team mailing list archive

[Laurent Vaucher <laurent.vaucher@xxxxxxxxxx>]

Like you, I don't know yet how matchTemplate operates on transparent
pixels. I still have to dive deeper into the code. But it's possible
that it ignores the alpha layer entirely. It would explain that
transparent white could be a good fit for light background. If you try
with transparent black, it will probably be better on dark backgrounds.

Anyway, I'll still investigate the OpenCV code, which is interesting in
its own right.

Thanks.

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https://bugs.launchpad.net/bugs/673995

Title:
  [request] Transparent pixels should be ignored in matching process

Status in Sikuli:
  New

Bug description:
  I'm using Sikuli 0.10.2 on a 32-bit Windows XP system. I just noticed
  that if you are using a png file, containing transparent pixels as a
  pattern for image recognition, these pixels are not skipped during the
  matching process, thus resulting in a wrong match if you have some
  kind of background under the transparent part of the image. I think
  this behavior is incorrect - and Sikuli could be even more powerful if
  able to skip some pixels from the pattern.

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