Pillow图片水印添加详解 - 文字水印半透明平铺水印教程

from PIL import Image, ImageDraw, ImageFont

# 文字水印绘制
draw = ImageDraw.Draw(img)
draw.text(position, text, fill=color, font=font)

# 图片水印（带透明度合成）
img.paste(watermark, position, mask=watermark)

from PIL import Image, ImageDraw, ImageFont

# 创建测试图像
img = Image.new('RGB', (400, 300), color='white')
draw = ImageDraw.Draw(img)

# 加载字体（尝试系统字体，失败则使用默认字体）
try:
    font = ImageFont.truetype("arial.ttf", 36)
except OSError:
    font = ImageFont.load_default()

# 计算水印文字尺寸
text = "Copyright 2024"
bbox = font.getbbox(text)
text_w = bbox[2] - bbox[0]
text_h = bbox[3] - bbox[1]

# 计算右下角位置（留出10像素边距）
x = img.width - text_w - 10
y = img.height - text_h - 10

# 绘制文字水印
draw.text((x, y), text, fill='gray', font=font)
print(f"文字水印位置: ({x}, {y})")
img.save('text_watermark.png')

文字水印位置: (195, 248)

from PIL import Image, ImageDraw, ImageFont

# 创建主图像
img = Image.new('RGB', (400, 300), color='skyblue')

# 创建半透明水印层（RGBA模式，初始完全透明）
watermark_layer = Image.new('RGBA', img.size, (0, 0, 0, 0))
draw = ImageDraw.Draw(watermark_layer)

try:
    font = ImageFont.truetype("arial.ttf", 30)
except OSError:
    font = ImageFont.load_default()

# 绘制半透明文字（RGBA四元组，第四个值为透明度0-255）
draw.text((50, 100), "SAMPLE", fill=(255, 255, 255, 80), font=font)
draw.text((50, 150), "DRAFT", fill=(255, 0, 0, 100), font=font)

# 将主图转为RGBA模式，然后与水印层合成
img_rgba = img.convert('RGBA')
composite = Image.alpha_composite(img_rgba, watermark_layer)
result = composite.convert('RGB')

result.save('transparent_watermark.png')
print("半透明水印已添加")

半透明水印已添加

from PIL import Image, ImageDraw, ImageFont

# 创建主图像
img = Image.new('RGB', (400, 300), color='lightyellow')

try:
    font = ImageFont.truetype("arial.ttf", 20)
except OSError:
    font = ImageFont.load_default()

text = "WATERMARK"
bbox = font.getbbox(text)
tw = bbox[2] - bbox[0]
th = bbox[3] - bbox[1]

# 创建透明水印层
watermark_layer = Image.new('RGBA', img.size, (0, 0, 0, 0))
draw = ImageDraw.Draw(watermark_layer)

# 循环平铺水印文字（每60像素一行，每150像素一列）
for y in range(0, img.height, 60):
    for x in range(0, img.width, 150):
        draw.text((x, y), text, fill=(200, 200, 200, 60), font=font)

# 合成水印层与主图
img_rgba = img.convert('RGBA')
composite = Image.alpha_composite(img_rgba, watermark_layer)
result = composite.convert('RGB')

result.save('tiled_watermark.png')
print("平铺水印已添加")

平铺水印已添加