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.  The negative filter basically subtracts the rgb values from 255 individually.  Intuitively, this filter would basically witch the RGB values upside-down.  In other words, the bright colors would turn dark and vice versa.  

For the following extensions,

  • Do something more interesting than a single color to replace the blue screen.
  • Place yourself in a scene. Start with a background scene that is the same size image as your blue-screen image. Then copy only non-blue pixels from your images into the background. You can do this by making a version of placeImage that copies only non-blue pixels. You could call it placeImageWithoutBlue.

I created two more filters to manipulate the background of my own image.  Again, the conditional statement and filter are the key.  

Image Added.  For this image, I manipulate the very-green pixels to have random values of RGB.Image Added.  Simple but interesting effect.

Image Added.  This image is a bit more complicated than a simple filter function.  Rather than manipulate the background pixels, I actually copied the non-green pixels to the source image, the X-ray image.  Thinks of this as combination of placeImage and filter function.  

Note that the conditional statement I used for this image is the opposite of what I wrote for blue screen effect.  The reason is that the pixels I am targeting are the exact opposites.Image Added.

 

Reflection:

Sources, imported libraries, and collaborators: