[solved] Bitmap color replacement a la EPrime

Comments

• JohnLJones

  July 2013 edited 5:07AM

  I found a work around that uses the python image library to change the target colors to transparent on the RGBa color band. Which then saves the image that is transparent in the target area and which can then be used in Open Sesame. Here is the code that I used in python 2.7 to do this which I got from here.
  This code will set all white pixels to transparent. Changing other colors to transparent simply entails changing the RGB values in the if and newData.append statements to match your target color. The final zero is the alpha channel setting for transparent.

  code: I was going to post the code here but the forum formatting throws off the indentations. I used the code from the link above with only changing the image filename in the image.open and image.save commands.
• sebastiaan

  July 2013 edited 5:07AM

  Hi John,

  I found a work around that uses the python image library to change the target colors to transparent on the RGBa color band. Which then saves the image that is transparent in the target area and which can then be used in Open Sesame.

  Yes, that's what I would recommend as well, in your case. Another alternative would be to use scipy.ndimage, but that's more suitable for doing mathematical things with your images (such as getting the center of gravity, of doing edge detection).

  code: I was going to post the code here but the forum formatting throws off the indentations. I used the code from the link above with only changing the image filename in the image.open and image.save commands.

  You can indicate your code using Markdown syntax, like so:

  ~~~ .python
  My code
  ~~~

  See also:

  • http://forum.cogsci.nl/index.php?p=/discussion/2/tips-and-tricks-e-mail-alerts-formatting-account-settings#Item_1

  Cheers!
  Sebastiaan

  
  
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