Enhance image resolution adjuster to support SDXL optimal aspect ratios with improved error handling. Update README files to reflect new features and use cases for the image resolution adjuster utility.

README.md

@@ -56,6 +56,21 @@ Features:
 - Supports trimming leading and trailing spaces
 - Flexible output format options
 
+### Image Resolution Adjuster
+A utility node for adjusting image resolutions according to SDXL optimal aspect ratios.
+
+Features:
+- Supports all SDXL optimal resolutions (1:1, 9:7, 7:9, 3:2, 2:3, etc.)
+- Adjustable scale factor for resolution scaling
+- Configurable maximum and minimum resolution constraints
+- Multiple extend modes (contain, cover, fill, etc.)
+- Maintains aspect ratio while resizing
+
+Use Cases:
+- Preparing images for SDXL generation
+- Batch resizing images to specific aspect ratios
+- Standardizing image dimensions for consistent processing
+
 ## 🎨 Usage Examples
 
 ### Dynamic Image Inputs Node

README_CN.md

@@ -51,6 +51,21 @@ git clone https://github.com/jammyfu/ComfyUI_PaintingCoderUtils.git
 - 支持移除首尾空格
 - 灵活的输出格式选项
 
+### 图像分辨率调整器 (Image Resolution Adjuster)
+一个用于按照 SDXL 最佳宽高比调整图像分辨率的实用节点。
+
+特点：
+- 支持所有 SDXL 最佳分辨率（1:1、9:7、7:9、3:2、2:3 等）
+- 可调节的缩放系数
+- 可配置的最大和最小分辨率限制
+- 多种延展模式（包含、覆盖、填充等）
+- 调整时保持宽高比
+
+使用场景：
+- 为 SDXL 生成准备图像
+- 批量调整图像至特定宽高比
+- 标准化图像尺寸以保持处理一致性
+
 ## 🎨 使用示例
 
 ### 动态图片输入节点

image_resolution_adjuster.py

@@ -124,15 +124,27 @@ def pad_image(image, target_width, target_height, position='center'):
 def calculate_resolution(aspect_ratio, scale_factor, max_width, max_height, min_width, min_height):
     """Calculate the target resolution based on aspect ratio and scale factor."""
     
-    # 从目标分辨率中提取实际的宽高比和尺寸
-    if "(" in aspect_ratio:
-        # 如果输入格式是 "9:7 (1152x896)" 这样的格式
-        dimensions = aspect_ratio.split("(")[1].strip(")").split("x")
-        base_width = int(dimensions[0])
-        base_height = int(dimensions[1])
+    # SDXL 最佳分辨率对照表
+    base_resolutions = {
+        "1:1": (1024, 1024),
+        "9:7": (1152, 896),
+        "7:9": (896, 1152),
+        "3:2": (1216, 832),
+        "2:3": (832, 1216),
+        "7:4": (1344, 768),
+        "4:7": (768, 1344),
+        "12:5": (1536, 640),
+        "5:12": (640, 1536),
+    }
+    
+    # 从输入中提取比例部分
+    ratio = aspect_ratio.split(" ")[0]
+    
+    # 查找对应的基础分辨率
+    if ratio in base_resolutions:
+        base_width, base_height = base_resolutions[ratio]
     else:
-        # 如果找不到对应的预设值，返回错误
-        raise ValueError(f"Unable to parse resolution from: {aspect_ratio}")
+        raise ValueError(f"Invalid aspect ratio: {ratio}")
 
     # 计算初始目标尺寸
     target_width = int(base_width * scale_factor)
@@ -155,7 +167,25 @@ def calculate_resolution(aspect_ratio, scale_factor, max_width, max_height, min_
     return target_width, target_height, base_width, base_height
 
 def get_aspect_ratio_string(width, height):
-    """Get the aspect ratio string from width and height"""
+    """Get the aspect ratio string from width and height, maintaining SDXL standard ratios"""
+    # SDXL 标准比例映射
+    sdxl_ratios = {
+        (1024, 1024): "1:1",
+        (1152, 896): "9:7",
+        (896, 1152): "7:9",
+        (1216, 832): "3:2",
+        (832, 1216): "2:3",
+        (1344, 768): "7:4",
+        (768, 1344): "4:7",
+        (1536, 640): "12:5",
+        (640, 1536): "5:12"
+    }
+    
+    # 如果是标准 SDXL 分辨率，直接返回对应的比例
+    if (width, height) in sdxl_ratios:
+        return sdxl_ratios[(width, height)]
+    
+    # 如果不是标准分辨率，则使用最大公约数计算
     common_divisor = gcd(width, height)
     aspect_width = width // common_divisor
     aspect_height = height // common_divisor