125 lines
3.9 KiB
Python
Executable File
125 lines
3.9 KiB
Python
Executable File
#!/usr/bin/env python3
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# -*- coding: utf-8 -*-
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"""
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福建水务营收系统 - 图片尺寸调整工具
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限制图片高度不超过23公分（约870像素）
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"""
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import argparse
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import os
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import sys
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from PIL import Image
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def resize_image_height(image_path, max_height_cm=23, dpi=96):
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"""
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通过调整DPI元数据控制图片打印高度，限制在指定厘米范围内
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Args:
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image_path (str): 图片文件路径
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max_height_cm (float): 最大高度（厘米）
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dpi (int): 默认DPI设置，用于参考
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Returns:
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bool: 调整是否成功
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"""
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try:
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# 检查文件是否存在
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if not os.path.exists(image_path):
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print(f"❌ 错误: 文件不存在 {image_path}")
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return False
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# 打开图片
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with Image.open(image_path) as img:
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original_width, original_height = img.size
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# 获取当前DPI（如果存在）
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current_dpi = img.info.get("dpi", (dpi, dpi))
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if isinstance(current_dpi, (list, tuple)):
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current_dpi_value = current_dpi[0]
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else:
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current_dpi_value = current_dpi
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# 计算当前图片的物理高度（厘米）
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current_height_cm = original_height / current_dpi_value * 2.54
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print("📏 图片信息:")
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print(f" 像素尺寸: {original_width}x{original_height}px")
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print(f" 当前DPI: {current_dpi_value}")
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print(f" 当前打印高度: {current_height_cm:.2f}cm")
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# 检查是否需要调整
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if current_height_cm <= max_height_cm:
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print(f"✅ 图片打印高度 {current_height_cm:.2f}cm 符合要求，无需调整")
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return True
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# 计算新的DPI以满足高度要求
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# 新DPI = 原始像素高度 / (目标高度厘米 / 2.54)
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required_dpi = original_height / (max_height_cm / 2.54)
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print("🔧 调整DPI元数据:")
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print(f" 原始DPI: {current_dpi_value}")
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print(f" 调整后DPI: {required_dpi:.0f}")
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print(f" 目标打印高度: {max_height_cm}cm")
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print(f" 像素尺寸保持不变: {original_width}x{original_height}px")
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# 创建新图片并设置DPI元数据
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new_img = img.copy()
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# 保存图片时设置新的DPI
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new_img.save(
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image_path, dpi=(required_dpi, required_dpi), optimize=True, quality=95
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)
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print(f"✅ 图片DPI元数据调整完成: {image_path}")
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print(f" 现在图片将以 {max_height_cm}cm 高度打印")
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return True
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except Exception as e:
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print(f"❌ 图片处理失败: {str(e)}")
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return False
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def main():
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"""主函数"""
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parser = argparse.ArgumentParser(
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description="调整图片高度，限制在23公分内",
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formatter_class=argparse.RawDescriptionHelpFormatter,
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epilog="""
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示例:
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python resize_image.py image.png
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python resize_image.py image.png --max-height 20
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python resize_image.py image.png --dpi 300
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""",
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)
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parser.add_argument("image_path", help="要处理的图片文件路径")
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parser.add_argument(
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"--max-height", type=float, default=23.0, help="最大高度（厘米），默认23厘米"
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)
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parser.add_argument("--dpi", type=int, default=96, help="DPI设置，默认96")
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parser.add_argument("--verbose", action="store_true", help="显示详细信息")
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args = parser.parse_args()
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# 处理图片
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if args.verbose:
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print("🔧 图片处理参数:")
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print(f" 文件: {args.image_path}")
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print(f" 最大高度: {args.max_height}cm")
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print(f" DPI: {args.dpi}")
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print()
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success = resize_image_height(args.image_path, args.max_height, args.dpi)
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# 返回适当的退出代码
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sys.exit(0 if success else 1)
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if __name__ == "__main__":
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main()
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