[open] Spectrum image, from what participants can choose colors. It is possible?

Comments

• Edwin

  February 2013 edited February 2013

  Hi,

  This would be a handy tool for research on synesthesia (for example), but currently such a tool does not exist. You might want to look at inline_scripting, especially the canvas functions: http://osdoc.cogsci.nl/python-inline-code/canvas-functions/

  If you're not so great at Python, this might be a good opportunity to learn Otherwise, it shouldn't be too difficult

  Good luck!
• sebastiaan

  February 2013 edited 3:00PM

  The easiest approach is probably to just use an image that is exactly the size of the display. That way you don't have to read the contents of the screen (which is hard), but can simply extract the contents from the image (which is easy). Perhaps this script will get you started. It reads an image called my_image.jpg from the file pool and goes into 'photoshop mode' until you click a button.

  from PIL import Image
  from openexp.mouse import mouse
  from openexp.canvas import canvas
  
  # Load an image from the file pool. This image must have the same
  # dimensions as the display resolution of the experiment!
  # See: http://www.pythonware.com/library/pil/handbook/image.htm
  src = exp.get_file('my_image.jpg') 
  img = Image.open(src)
  
  # Create a mouse object and make the cursor visible
  # See: http://osdoc.cogsci.nl/python-inline-code/mouse-functions/
  mouse = mouse(exp)
  mouse.set_visible(True)
  
  # Create a canvas object
  # See: http://osdoc.cogsci.nl/python-inline-code/canvas-functions/
  canvas = canvas(exp)
  
  # Loop infinitely
  while True:
      # Get the mouse position
      pos, time = mouse.get_pos()
      # Get the color of the image at the mouse position
      col = img.getpixel(pos)
      # Draw a canvas with the image and a rectangle with the extracted color
      canvas.clear()
      canvas.image(src)
      canvas.rect(10, 10, 100, 100, color=col, fill=True)
      canvas.show()
      # Break the loop if a button is clicked
      if mouse.get_click(timeout=1)[0] != None:
          break
  

  If you're not so great at Python, this might be a good opportunity to learn

  But this is definitely true! You will probably want to (at least) tweak this script, and this will require knowledge of Python. A good start:

  • http://osdoc.cogsci.nl/python-inline-code/about-python-inline-code/#learning

  Cheers!
  Sebastiaan

  
  
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