修改图片分辨率，python实现修改图片分辨率（大小） |
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1.修改一张图片分辨率 将input.jpg和output.jpg改成自己的输入输出文件路径 from PIL import Image def resize_image(input_image_path, output_image_path, new_width, new_height): image = Image.open(input_image_path) resized_image = image.resize((new_width, new_height)) resized_image.save(output_image_path) # 使用示例 input_image_path = "input.jpg" output_image_path = "output.jpg" new_width = 800 new_height = 600 resize_image(input_image_path, output_image_path, new_width, new_height)2.将一个目录（文件夹）上的所有图片修改成相同的分辨率 import os from PIL import Image def resize_images_in_folder(input_folder, output_folder, new_width, new_height): # 遍历输入文件夹中的所有文件 for filename in os.listdir(input_folder): if filename.endswith(".jpg") or filename.endswith(".png"): # 构建输入和输出文件的路径 input_image_path = os.path.join(input_folder, filename) output_image_path = os.path.join(output_folder, filename) # 调用resize_image函数修改图片分辨率 resize_image(input_image_path, output_image_path, new_width, new_height) def resize_image(input_image_path, output_image_path, new_width, new_height): image = Image.open(input_image_path) resized_image = image.resize((new_width, new_height)) resized_image.save(output_image_path) # 使用示例 input_folder = "input_folder" output_folder = "output_folder" new_width = 800 new_height = 600 resize_images_in_folder(input_folder, output_folder, new_width, new_height)3.等比例修改图片分辨率（大小） from PIL import Image def resize_image(input_path, output_path, new_width, new_height): # 打开图片 image = Image.open(input_path) # 计算缩放比例 width, height = image.size aspect_ratio = width / height if new_width is None: new_width = int(new_height * aspect_ratio) elif new_height is None: new_height = int(new_width / aspect_ratio) # 缩放图片 resized_image = image.resize((new_width, new_height), Image.ANTIALIAS) # 保存缩放后的图片 resized_image.save(output_path) if __name__ == "__main__": input_path = "input.jpg" # 输入图片的文件路径 output_path = "output.jpg" # 输出图片的文件路径 new_width = 800 # 新的宽度，设置为None以根据高度自动计算 new_height = None # 新的高度，设置为None以根据宽度自动计算 resize_image(input_path, output_path, new_width, new_height)4.递归实现等比例修改一个目录下所有目录的图片分辨率，并且覆盖之前图片 import os from PIL import Image def resize_image(input_path, new_width, new_height): # 打开图片 image = Image.open(input_path) # 计算缩放比例 width, height = image.size aspect_ratio = width / height if new_width is None: new_width = int(new_height * aspect_ratio) elif new_height is None: new_height = int(new_width / aspect_ratio) # 缩放图片 resized_image = image.resize((new_width, new_height), Image.ANTIALIAS) # 覆盖原始图片 resized_image.save(input_path) def resize_images_in_directory(directory, new_width, new_height): for root, dirs, files in os.walk(directory): for filename in files: if filename.lower().endswith(('.jpg', '.jpeg', '.png', '.gif')): input_path = os.path.join(root, filename) resize_image(input_path, new_width, new_height) if __name__ == "__main__": target_directory = "your_directory_path" # 指定要处理的目录的路径 new_width = 800 # 新的宽度，设置为None以根据高度自动计算 new_height = None # 新的高度，设置为None以根据宽度自动计算 resize_images_in_directory(target_directory, new_width, new_height) |
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