diff --git a/hutool-swing/src/main/java/org/dromara/hutool/swing/captcha/AbstractCaptcha.java b/hutool-swing/src/main/java/org/dromara/hutool/swing/captcha/AbstractCaptcha.java
index 0218667ff..6b502c9df 100644
--- a/hutool-swing/src/main/java/org/dromara/hutool/swing/captcha/AbstractCaptcha.java
+++ b/hutool-swing/src/main/java/org/dromara/hutool/swing/captcha/AbstractCaptcha.java
@@ -72,7 +72,7 @@ public abstract class AbstractCaptcha implements ICaptcha {
 	/**
 	 * 背景色
 	 */
-	protected Color background;
+	protected Color background = Color.WHITE;
 	/**
 	 * 文字透明度
 	 */
@@ -267,7 +267,7 @@ public abstract class AbstractCaptcha implements ICaptcha {
 	}
 
 	/**
-	 * 设置背景色
+	 * 设置背景色，{@code null}表示透明背景
 	 *
 	 * @param background 背景色
 	 * @since 4.1.22
diff --git a/hutool-swing/src/main/java/org/dromara/hutool/swing/captcha/CircleCaptcha.java b/hutool-swing/src/main/java/org/dromara/hutool/swing/captcha/CircleCaptcha.java
index b227463ba..713e62c1b 100644
--- a/hutool-swing/src/main/java/org/dromara/hutool/swing/captcha/CircleCaptcha.java
+++ b/hutool-swing/src/main/java/org/dromara/hutool/swing/captcha/CircleCaptcha.java
@@ -12,14 +12,12 @@
 
 package org.dromara.hutool.swing.captcha;
 
-import org.dromara.hutool.core.util.ObjUtil;
 import org.dromara.hutool.core.util.RandomUtil;
 import org.dromara.hutool.swing.captcha.generator.CodeGenerator;
 import org.dromara.hutool.swing.captcha.generator.RandomGenerator;
-import org.dromara.hutool.swing.img.color.ColorUtil;
 import org.dromara.hutool.swing.img.GraphicsUtil;
+import org.dromara.hutool.swing.img.color.ColorUtil;
 
-import java.awt.Color;
 import java.awt.Graphics2D;
 import java.awt.Image;
 import java.awt.image.BufferedImage;
@@ -94,8 +92,8 @@ public class CircleCaptcha extends AbstractCaptcha {
 
 	@Override
 	public Image createImage(final String code) {
-		final BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
-		final Graphics2D g = GraphicsUtil.createGraphics(image, ObjUtil.defaultIfNull(this.background, Color.WHITE));
+		final BufferedImage image = new BufferedImage(width, height, (null == this.background) ? BufferedImage.TYPE_4BYTE_ABGR : BufferedImage.TYPE_INT_RGB);
+		final Graphics2D g = GraphicsUtil.createGraphics(image, this.background);
 
 		try {
 			// 随机画干扰圈圈
diff --git a/hutool-swing/src/main/java/org/dromara/hutool/swing/captcha/LineCaptcha.java b/hutool-swing/src/main/java/org/dromara/hutool/swing/captcha/LineCaptcha.java
index bda92cba8..8fed11add 100644
--- a/hutool-swing/src/main/java/org/dromara/hutool/swing/captcha/LineCaptcha.java
+++ b/hutool-swing/src/main/java/org/dromara/hutool/swing/captcha/LineCaptcha.java
@@ -12,14 +12,12 @@
 
 package org.dromara.hutool.swing.captcha;
 
-import org.dromara.hutool.core.util.ObjUtil;
 import org.dromara.hutool.core.util.RandomUtil;
 import org.dromara.hutool.swing.captcha.generator.CodeGenerator;
 import org.dromara.hutool.swing.captcha.generator.RandomGenerator;
-import org.dromara.hutool.swing.img.color.ColorUtil;
 import org.dromara.hutool.swing.img.GraphicsUtil;
+import org.dromara.hutool.swing.img.color.ColorUtil;
 
-import java.awt.Color;
 import java.awt.Graphics;
 import java.awt.Graphics2D;
 import java.awt.Image;
@@ -88,8 +86,8 @@ public class LineCaptcha extends AbstractCaptcha {
 	@Override
 	public Image createImage(final String code) {
 		// 图像buffer
-		final BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
-		final Graphics2D g = GraphicsUtil.createGraphics(image, ObjUtil.defaultIfNull(this.background, Color.WHITE));
+		final BufferedImage image = new BufferedImage(width, height, (null == this.background) ? BufferedImage.TYPE_4BYTE_ABGR : BufferedImage.TYPE_INT_RGB);
+		final Graphics2D g = GraphicsUtil.createGraphics(image, this.background);
 
 		try {
 			// 干扰线
diff --git a/hutool-swing/src/main/java/org/dromara/hutool/swing/captcha/ShearCaptcha.java b/hutool-swing/src/main/java/org/dromara/hutool/swing/captcha/ShearCaptcha.java
index f617801c3..3edcf7963 100644
--- a/hutool-swing/src/main/java/org/dromara/hutool/swing/captcha/ShearCaptcha.java
+++ b/hutool-swing/src/main/java/org/dromara/hutool/swing/captcha/ShearCaptcha.java
@@ -94,8 +94,8 @@ public class ShearCaptcha extends AbstractCaptcha {
 
 	@Override
 	public Image createImage(final String code) {
-		final BufferedImage image = new BufferedImage(this.width, this.height, BufferedImage.TYPE_INT_RGB);
-		final Graphics2D g = GraphicsUtil.createGraphics(image, ObjUtil.defaultIfNull(this.background, Color.WHITE));
+		final BufferedImage image = new BufferedImage(width, height, (null == this.background) ? BufferedImage.TYPE_4BYTE_ABGR : BufferedImage.TYPE_INT_RGB);
+		final Graphics2D g = GraphicsUtil.createGraphics(image, this.background);
 
 		try {
 			// 画字符串