The Green Screen Algorithm (also known as chromakey algorithm) is used to change the background image which is green color and replace it with any effect or other image. Basically what we are doing is, we are replacing all the green pixels in the forward image with the corresponding pixels from the background image. Also, we have to remember of the size of the output image which should be same as forward image. Then the pixels from the forward image are copied into the new image. The corresponding pixels of background image get copied instead of green pixels.
Before implementing the following code, do not forget to mention the below source file in your HTML code:
This algorithms take two images as input. One is forward image which contains green color in background, and other is background image which is to be replaced in place of green background.
After taking both images as input, the following code merges both the image and hence backward images replaces the green background of the forward image. So, above was the code to implement Green Screen Algorithm.