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A camera in the Scratch editor takes photos using the Video Sensing Extension.
Color Detection Method
The color detection is one of the most popular methods of creating a camera on Scratch. This is an example. This method works by turning on the Video Sensing function, and moving a sprite across the screen. The sprite detects the color it is touching, stores it on a list, and moves on. It repeats this process until it's moved across the entire screen. The smaller the movement, the higher the resolution, but the longer the exposure time. One the sprite finishes scanning the picture, a pen recreates the image based on the data stored on the list. This method is low resolution, slow, and complicated, but it allows for pictures to be saved and causes no glitches to the Scratch Website.