Why does my transparent PNG blit as black in Pygame, and how can I fix it?

Blitting PNG Images with Transparency in Pygame

Question:

Attempting to blit a PNG image onto a surface results in the transparent part appearing as black. Here's the simplified code causing the issue:

<code class="python">import pygame

# ...

treeImage = pygame.image.load("tree.png")

# ...</code>

Why does the transparency become black, and how can it be resolved?

Answer:

According to the Pygame documentation, for alpha transparency in PNG images, the convert_alpha() method should be called after loading the image. This ensures that the image has per pixel transparency.

To fix the problem, simply add the following line after loading the image:

<code class="python">treeImage.convert_alpha()</code>

This will convert the image to a format that supports per pixel transparency, allowing the transparent areas to be displayed correctly.

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