An Artist's Guide to Programming

3 2D Graphics and Animation

Sketch 27: Saving an Image and Adjusting Transparency

We are going to write a sketch that will allow the user to select a color in an image that will become transparent, and then save the image as a GIF. We can save any PImage in a file, just as most image files can be read into a PImage. If img is a PImage variable, we can save it as a file using this function call:

img.save ("image.jpg");

The parameter is the name of the file to be created. In the situation above, it will create a file named image.jpg and save the pixels of the PImage in JPEG format. The format is conveniently determined by the last three letters ...