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copied!<p>EDIT: Sorry, my initial answer was only related to transparency within in PyGame, not for saving images.</p> <p>To do pixel modification, you would probably want to use another library such as PIL (Python Imaging Library).</p> <p>See this thread if you want to give PIL a shot: <a href="https://stackoverflow.com/questions/1616767/pil-best-way-to-replace-color">PIL Best Way To Replace Color?</a></p> <p>If you want to stick with PyGame for this, then you should look into pygame.surfarray: <a href="http://www.pygame.org/docs/tut/surfarray/SurfarrayIntro.html" rel="nofollow noreferrer">http://www.pygame.org/docs/tut/surfarray/SurfarrayIntro.html</a></p> <p>EDIT2: Here's a quick snippet:</p> <pre><code>import pygame # initialize pygame pygame.init() pygame.display.set_mode((500, 500)) # load image image_surf = pygame.image.load('test.png',).convert_alpha() # load pixel information from surface image_pixels = pygame.surfarray.pixels3d(image_surf) # create a copy for pixel manipulation new_surf = image_surf.copy() # loop through every pixel i = 0 for x in range(len(image_pixels)): for y in range(len(image_pixels[0])): if image_pixels[x][y][0] == 0 and image_pixels[x][y][1] == 0 and image_pixels[x][y][2] == 0: # set transparency new_surf.set_at((x, y), pygame.Color(0, 0, 0, 0)) # save image pygame.image.save(new_surf, "out.png") </code></pre> <hr> <p>OLD ANSWER: How to achieve transparency within in PyGame</p> <p>You need to look-up set_colorkey(): <a href="http://www.pygame.org/docs/ref/surface.html#pygame.Surface.set_colorkey" rel="nofollow noreferrer">http://www.pygame.org/docs/ref/surface.html#pygame.Surface.set_colorkey</a></p> <p>If your image is already transparent, then you'd just need to load the image with .convert_alpha():</p> <pre><code>asurf = pygame.image.load(os.path.join("shot.png")).convert_alpha() </code></pre> <p>Even if you do not have transparency in your image, it's always a good idea to call .convert():</p> <pre><code>asurf = pygame.image.load(os.path.join("shot.png")).convert() </code></pre> <p>See this: (Link removed due to a 2-links-only limit)</p>

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