sikuli-driver team mailing list archive

[RaiMan <rmhdevelop@xxxxxx>]

one more thing:
I do not recommend, to use the conversion trail png -> jpeg -> png, because depending on the used options you may loose valuable image information, since jpeg generally is not lossless.

In most cases you will not get the original image content when
converting back to png.

So if you want to get rid of the transparency channel, simply convert
from png-with-transparency to png-without-transparency (in Preview just
switch off the respective option, when exporting the image - might be
possible with sips too)

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https://bugs.launchpad.net/bugs/1306396

Title:
  [request] image files having a transparent background should be
  supported somehow

Status in Sikuli:
  In Progress

Bug description:
  from https://answers.launchpad.net/sikuli/+question/241355 comment
  #10:

  The other issue I run into when grabbing images from products or
  source trees is that png's can (and often do) have transparent
  backgrounds. You can convert those to jpeg's and back to png's using
  sips, but they end up with a white background. If someone has a Mac
  solution, without having to use ImageMagick or something else to be
  downloaded, I'd be grateful for a solution.

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