Pygame Chroma Key

Yes, it is possible to add chroma key functionality to Pygame using the Pygame surface blend modes.

To do this, you will need to have a background image and a foreground image with a solid color that you want to use as the chroma key. You can then use the set_colorkey() method of the foreground image to specify the color that you want to use as the chroma key, and set the BLEND_RGB_MULT blend mode of the foreground image using the set_alpha() method.

Here is an example of how you could use these methods to add chroma key functionality to Pygame:

import pygame

# Load the background image and the foreground image with the chroma key color
background_image = pygame.image.load("background.png")
foreground_image = pygame.image.load("foreground.png")

# Set the chroma key color of the foreground image
foreground_image.set_colorkey((0, 255, 0))  # Use green as the chroma key color

# Set the blend mode of the foreground image to BLEND_RGB_MULT
foreground_image.set_alpha(pygame.BLEND_RGB_MULT)

# Display the images on the screen
screen = pygame.display.set_mode((640, 480))
screen.blit(background_image, (0, 0))
screen.blit(foreground_image, (0, 0))
pygame.display.flip()

# Run the game loop
running = True
while running:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            running = False

This example will display the foreground image on top of the background image, with the chroma key color of the foreground image (green in this case) being transparent.