fix: address Sourcery AI review comments

- Fix dsl.rb YARD: RGB 0-441 → RGBA 0-510 to match updated docs
- Fix README: rename "Raw RGB tolerance" to "Tolerance-based comparison"
- Fix typo: "allow" → "allows" in configuration.md

Co-authored-by: Qwen-Coder <qwen-coder@alibabacloud.com>

Author: pftg

README.md

@@ -103,7 +103,7 @@ If you see inconsistent results, choose a color comparison method:
 # Option 1: Perceptual (recommended, VIPS only)
 Capybara::Screenshot::Diff.perceptual_threshold = 2.0
 
-# Option 2: Raw RGB tolerance (legacy)
+# Option 2: Tolerance-based comparison (legacy)
 Capybara::Screenshot::Diff.tolerance = 0.0005
 
 # Always set window_size for consistent dimensions

docs/configuration.md

@@ -29,7 +29,7 @@ end
 | Standard Rails apps | 0.001 (default) | 15 | 1s |
 | Pixel-perfect design tests | 0.0001 | 5 | 1s |
 
-**Note:** VIPS defaults to `tolerance: 0.001` (allow 0.1% pixel difference). ChunkyPNG has no default tolerance.
+**Note:** VIPS defaults to `tolerance: 0.001` (allows 0.1% pixel difference). ChunkyPNG has no default tolerance.
 
 ## Choosing the Right Color Comparison Method
 

lib/capybara_screenshot_diff/dsl.rb

@@ -43,7 +43,7 @@ def screenshot_group(name)
     # @option options [Numeric] :tolerance (0.001 for :vips driver) Color tolerance for comparison.
     #   Represents the maximum allowed ratio of different pixels (0.0-1.0 scale).
     # @option options [Numeric] :color_distance_limit Maximum allowed color distance between pixels.
-    #   Uses Euclidean RGB distance (0-441 scale). Mutually exclusive with :perceptual_threshold.
+    #   Uses Euclidean RGBA distance (0-510 scale). Mutually exclusive with :perceptual_threshold.
     # @option options [Numeric] :perceptual_threshold Maximum perceptual color difference (CIE dE00).
     #   Uses human perception-based scale (0-100+). VIPS only. Takes priority over :color_distance_limit if both set.
     # @option options [Numeric] :shift_distance_limit Maximum allowed shift distance for pixels.