使用pygame.font模块时，渲染文本时不会考虑文本颜色的Alpha通道，但请参见pygame.font.Font.render：

抗锯齿图像被渲染为24位RGB图像。如果背景是透明的，则将包含像素alpha。

和
pygame.Surface.set_alpha

在pygame 2.0中进行了更改：可以将每个表面的alpha与每个像素的alpha组合在一起。

因此，用渲染文本后设​​置透明度就足够了set_alpha。这甚至适用于抗锯齿的文本：

font = pygame.font.SysFont(None, 150)

text_surf = font.render('test text', True, (255, 0, 0))
text_surf.set_alpha(127)

window.blit(text_surf, (x, y))

最小示例： [![](https://i.stack.imgur.com/5jD0C.png) repl.it/@Rabbid76/PyGame- TransparentText](https://repl.it/@Rabbid76/PyGame-TransparentText#main.py)

import pygame

pygame.init()
window = pygame.display.set_mode((500, 300))
clock = pygame.time.Clock()
font = pygame.font.SysFont(None, 150)

text_surf = font.render('test text', True, (255, 0, 0))
text_surf.set_alpha(127)

background = pygame.Surface(window.get_size())
ts, w, h, c1, c2 = 50, *window.get_size(), (128, 128, 128), (64, 64, 64)
tiles = [((x*ts, y*ts, ts, ts), c1 if (x+y) % 2 == 0 else c2) for x in range((w+ts-1)//ts) for y in range((h+ts-1)//ts)]
for rect, color in tiles:
    pygame.draw.rect(background, color, rect)

run = True
while run:
    clock.tick(60)
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            run = False

    window.blit(background, (0, 0))
    window.blit(text_surf, text_surf.get_rect(center = window.get_rect().center))
    pygame.display.flip()

pygame.quit()
exit()

通过使用该pygame.freetype模块，可以在创建文本表面时直接使用透明颜色：

ft_font = pygame.freetype.SysFont('Times New Roman', 150)

text_surf2, text_rect2 = ft_font.render('test text', (255, 0, 0, 128))
window.blit(text_surf2, (x, y))

或者，如果将文本直接渲染到曲面上：

ft_font = pygame.freetype.SysFont('Times New Roman', 150)

ft_font.render_to(window, (x, y), 'test text', (255, 0, 0, 128))

最小示例： [![](https://i.stack.imgur.com/5jD0C.png) repl.it/@Rabbid76/PyGame- TransparentFreeTypeText](https://repl.it/@Rabbid76/PyGame- TransparentFreeTypeText#main.py)

import pygame
import pygame.freetype

pygame.init()

window = pygame.display.set_mode((500, 300))
clock = pygame.time.Clock()
ft_font = pygame.freetype.SysFont('Times New Roman', 150)

text_surf2, text_rect2 = ft_font.render('test text', (255, 0, 0, 128))

background = pygame.Surface(window.get_size())
ts, w, h, c1, c2 = 50, *window.get_size(), (128, 128, 128), (64, 64, 64)
tiles = [((x*ts, y*ts, ts, ts), c1 if (x+y) % 2 == 0 else c2) for x in range((w+ts-1)//ts) for y in range((h+ts-1)//ts)]
for rect, color in tiles:
    pygame.draw.rect(background, color, rect)

run = True
while run:
    clock.tick(60)
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            run = False

    window.blit(background, (0, 0))

    text_rect = ft_font.get_rect('test text')
    text_rect.center = (window.get_width() // 2, window.get_height() // 2 - 70)
    ft_font.render_to(window, text_rect.topleft, 'test text', (255, 0, 0, 128))

    text_rect2.center = (window.get_width() // 2, window.get_height() // 2 + 70)
    window.blit(text_surf2, text_rect2)

    pygame.display.flip()

pygame.quit()
exit()

另请参阅文本和字体