如何转换图像的背景颜色以匹配 Pygame 窗口的颜色？

Question

我需要做的是将图像背景的颜色与 Pygame 窗口的颜色相匹配。 但是图像和pygame窗口的背景不匹配。它看起来像这样

ship.py

import pygame

class Ship:
    """ A class to manage the ship. """
    
def __init__(self, ai_game):
    """ Initialize the ship and the starting position. """
    self.screen = ai_game.screen
    self.screen_rect = ai_game.screen.get_rect()

    # Load the ship image and get its rect.
    self.image = pygame.image.load('images/ship.bmp')
    self.rect = self.image.get_rect()

    # Start each new ship at the bottom center of the screen.
    self.rect.midbottom = self.screen_rect.midbottom

def blitme(self):
    """ Draw ship at its current location. """
    self.screen.blit(self.image, self.rect)

外星人入侵.py

import sys
import pygame
from ship import Ship


class AlienInvasion:
"""Overall class to manage game assets and behavior."""

def __init__(self):
    """Initialize the game, and create game resources."""
    pygame.init()
    self.screen = pygame.display.set_mode((1200, 800))
    pygame.display.set_caption("Alien Invasion")

    # Set background colour
    self.bg_color = (0, 0, 255)
    self.ship = Ship(self)
    
def run_game(self):
"""Start the main loop for the game."""
while True:
    # Watch for keyboard and mouse events.
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            sys.exit()
            
    # Redraw the screen during each pass through the loop.
    self.screen.fill(self.bg_color)
    self.ship.blitme()

    # Make the most recently drawn screen visible.
    pygame.display.flip()


if __name__ == '__main__':
# Make a game instance, and run the game.
ai = AlienInvasion()
ai.run_game()

I tried the answers from this discussion 但我无法修复它。

我不明白如何使用image.convert_alpha() 和image.set_colorkey()，在ship.py 中使用它们对我来说没有任何变化。

注意：ship.py 是在船上进行更改的类，而 alieninvasion.py 是主文件。

Answer 1

你不需要把图片的背景色改成窗口的背景色，只需要让图片的背景透明即可。

---

通过pygame.Surface.set_colorkey设置透明色键：

设置 Surface 的当前颜色键。当将此 Surface 位图传输到目标上时，任何与颜色键颜色相同的像素都将是透明的。

注意，所有背景必须具有完全相同的颜色。在您的情况下，背景颜色似乎是灰色（230、230、230）：

self.image = pygame.image.load('images/ship.bmp').convert()
self.image.set_colorkey((230, 230, 230))

---

另一种选择是创建一个新图像（您需要在绘画应用程序中绘制它），每像素 alpha（例如PNG）和透明背景：

self.image = pygame.image.load('images/ship.png').convert_alpha()