继续优化深色模式显示

app/export/image_exporter.py

@@ -2,6 +2,21 @@
 import os
 
 
+_EXPORT_BG_COLOR = "#FFFFFF"
+
+
+def _save_with_light_background(fig, path, *, dpi=300, bbox_inches=None):
+    """导出统一浅色背景，避免深色主题下图片背景变暗。"""
+    kwargs = {
+        "dpi": dpi,
+        "facecolor": _EXPORT_BG_COLOR,
+        "edgecolor": _EXPORT_BG_COLOR,
+    }
+    if bbox_inches is not None:
+        kwargs["bbox_inches"] = bbox_inches
+    fig.savefig(path, **kwargs)
+
+
 def _gamut_refs_for_type(test_type):
     """按测试类型返回需要导出的参考色域列表。"""
     if test_type == "sdr_movie":
@@ -70,7 +85,7 @@ def save_result_images(result_dir, current_test_type, selected_items,
                             continue
                         per_ref_name = f"色域测试结果_{ref}.png"
                         path = os.path.join(result_dir, per_ref_name)
-                        fig.savefig(path, dpi=300)
+                        _save_with_light_background(fig, path, dpi=300)
                         log(f"已保存: {per_ref_name}")
                 finally:
                     ref_var.set(original_ref)
@@ -82,7 +97,7 @@ def save_result_images(result_dir, current_test_type, selected_items,
             continue
         path = os.path.join(result_dir, filename)
         if default_bbox:
-            fig.savefig(path, dpi=300)
+            _save_with_light_background(fig, path, dpi=300)
         else:
-            fig.savefig(path, dpi=300, bbox_inches="tight")
+            _save_with_light_background(fig, path, dpi=300, bbox_inches="tight")
         log(f"已保存: {filename}")