init

image_processor.py

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+from PIL import Image
+import os
+from config import Config
+from logger import logger
+
+class ImageProcessor:
+    @staticmethod
+    def resize_by_ratio(img, ratio_width, ratio_height):
+        """等比例缩放至目标比例（最长边适配）"""
+        w, h = img.size
+        target_ratio = ratio_width / ratio_height
+        current_ratio = w / h
+        if current_ratio > target_ratio:
+            new_w = int(h * target_ratio)
+            new_h = h
+        else:
+            new_w = w
+            new_h = int(w / target_ratio)
+        return img.resize((new_w, new_h), Image.Resampling.LANCZOS)
+
+    @staticmethod
+    def resize_by_pixel(img, target_width, target_height):
+        """等比例缩放至不超过目标像素（保持比例，以较长边为准）"""
+        w, h = img.size
+        ratio_w = target_width / w
+        ratio_h = target_height / h
+        ratio = min(ratio_w, ratio_h)
+        new_w = int(w * ratio)
+        new_h = int(h * ratio)
+        return img.resize((new_w, new_h), Image.Resampling.LANCZOS)
+
+    @staticmethod
+    def convert_image(input_path, output_path, target_format, quality=None):
+        """转换图片格式，可选缩放（尺寸解析在外部处理）"""
+        try:
+            with Image.open(input_path) as img:
+                # 转换模式（RGBA转RGB对于JPEG）
+                if target_format.lower() in ['jpg', 'jpeg'] and img.mode in ('RGBA', 'P'):
+                    rgb_img = Image.new('RGB', img.size, (255, 255, 255))
+                    rgb_img.paste(img, mask=img.split()[-1] if img.mode == 'RGBA' else None)
+                    img = rgb_img
+                save_kwargs = {}
+                if target_format.lower() in ['jpg', 'jpeg', 'webp']:
+                    save_kwargs['quality'] = quality if quality is not None else Config.DEFAULT_QUALITY
+                img.save(output_path, format=target_format.upper(), **save_kwargs)
+                logger.info(f"转换成功: {input_path} -> {output_path}")
+                return True
+        except Exception as e:
+            logger.error(f"转换失败 {input_path}: {e}")
+            return False