修正shade scale反算。

color-module/src/reversing.rs

@@ -42,17 +42,17 @@ impl MixReversing {
         let r_factor = if basic_color.red == 0.0 {
             0.0
         } else {
-            (basic_color.red - mixed_result.red) / (0.0 - basic_color.red)
+            (mixed_result.red - basic_color.red) / (0.0 - basic_color.red)
         };
         let g_factor = if basic_color.green == 0.0 {
             0.0
         } else {
-            (basic_color.green - mixed_result.green) / (0.0 - basic_color.green)
+            (mixed_result.green - basic_color.green) / (0.0 - basic_color.green)
         };
         let b_factor = if basic_color.blue == 0.0 {
             0.0
         } else {
-            (basic_color.blue - mixed_result.blue) / (0.0 - basic_color.blue)
+            (mixed_result.blue - basic_color.blue) / (0.0 - basic_color.blue)
         };
         let average = (r_factor + g_factor + b_factor) / 3.0;