diff --git a/captcha/captcha.sh b/captcha/captcha.sh
index 5e2fd3b..3abfaf5 100755
--- a/captcha/captcha.sh
+++ b/captcha/captcha.sh
@@ -105,6 +105,6 @@ convert -size 180x60 xc:none -pointsize 40 \
 	-wave "$WAVE3_AMPLITUDE"x"$WAVE3_LENGTH" \) \
 	-distort Perspective "0,0,0,0 0,$RAND_C,0,80 80,0,80,5 80,80,80,55" \
 	-rotate "+$RAND_D" \
-	\( -size 140x60 xc: +noise Random -alpha set -channel A -evaluate set 30% \) \
+	\( -size 140x60 xc: +noise Random -alpha set -channel A -evaluate set 40% \) \
 	-compose add \
 	-flatten -crop 140x60 +repage -quality 500 -depth 11 png:-
diff --git a/captcha/experimental.sh b/captcha/experimental.sh
index 5e2fd3b..3abfaf5 100755
--- a/captcha/experimental.sh
+++ b/captcha/experimental.sh
@@ -105,6 +105,6 @@ convert -size 180x60 xc:none -pointsize 40 \
 	-wave "$WAVE3_AMPLITUDE"x"$WAVE3_LENGTH" \) \
 	-distort Perspective "0,0,0,0 0,$RAND_C,0,80 80,0,80,5 80,80,80,55" \
 	-rotate "+$RAND_D" \
-	\( -size 140x60 xc: +noise Random -alpha set -channel A -evaluate set 30% \) \
+	\( -size 140x60 xc: +noise Random -alpha set -channel A -evaluate set 40% \) \
 	-compose add \
 	-flatten -crop 140x60 +repage -quality 500 -depth 11 png:-