diff --git a/designer-base/src/main/java/com/fr/design/cell/CellStylePreviewPane.java b/designer-base/src/main/java/com/fr/design/cell/CellStylePreviewPane.java
index 355dca62d..12f5a5228 100644
--- a/designer-base/src/main/java/com/fr/design/cell/CellStylePreviewPane.java
+++ b/designer-base/src/main/java/com/fr/design/cell/CellStylePreviewPane.java
@@ -51,14 +51,7 @@ public class CellStylePreviewPane extends JPanel {
     }
 
     private void paintTransparentBackground(Graphics2D g2d, Style style) {
-        Color fontColor = style.getFRFont().getForeground();
-        float g = fontColor.getRed() * 0.299F + fontColor.getGreen() * 0.587F * fontColor.getBlue() * 0.114F;
-        float alpha = 1.0F;
-        if (g < 50) {
-            alpha = 0.2F;
-        } else if (g < 160){
-            alpha = 0.5F;
-        }
+        float alpha = computeTransparentBackgroundAlpha(style);
 
         float scaleWidth = 1.0F * getWidth() / transparentBackgroundWidth;
         float scaleHeight = 1.0F * getHeight() / transparentBackgroundHeight;
@@ -76,6 +69,23 @@ public class CellStylePreviewPane extends JPanel {
         g2d.setComposite(oldComposite);
     }
 
+    private float computeTextColorBrightness(Style style) {
+        Color fontColor = style.getFRFont().getForeground();
+        return fontColor.getRed() * 0.299F + fontColor.getGreen() * 0.587F + fontColor.getBlue() * 0.114F;
+    }
+
+    private float computeTransparentBackgroundAlpha(Style style) {
+        float textBrightness = computeTextColorBrightness(style);
+
+        float alpha = 1.0F;
+        if (textBrightness < 50) {
+            alpha = 0.2F;
+        } else if (textBrightness < 160){
+            alpha = 0.5F;
+        }
+        return alpha;
+    }
+
     private void paintCellStyle(Graphics2D g2d, Style style) {
         int resolution = ScreenResolution.getScreenResolution();