change code

hutool-core/src/main/java/cn/hutool/core/img/ImgUtil.java

@@ -1515,8 +1515,9 @@ public class ImgUtil {
 			imageType = IMAGE_TYPE_JPG;
 		}
 
-		final ImageWriter writer = getWriter(image, imageType);
-		return write(toBufferedImage(image, imageType), writer, destImageStream, quality);
+		final BufferedImage bufferedImage = toBufferedImage(image, imageType);
+		final ImageWriter writer = getWriter(bufferedImage, imageType);
+		return write(bufferedImage, writer, destImageStream, quality);
 	}
 
 	/**
@@ -1783,7 +1784,7 @@ public class ImgUtil {
 	 * @since 4.3.2
 	 */
 	public static ImageWriter getWriter(Image img, String formatName) {
-		final ImageTypeSpecifier type = ImageTypeSpecifier.createFromRenderedImage(toRenderedImage(img));
+		final ImageTypeSpecifier type = ImageTypeSpecifier.createFromRenderedImage(toBufferedImage(img, formatName));
 		final Iterator<ImageWriter> iter = ImageIO.getImageWriters(type, formatName);
 		return iter.hasNext() ? iter.next() : null;
 	}

hutool-core/src/test/java/cn/hutool/core/img/ImgUtilTest.java

@@ -98,7 +98,8 @@ public class ImgUtilTest {
 	@Test
 	@Ignore
 	public void writeTest() {
-		ImgUtil.write(ImgUtil.read("e:/test2.png"), FileUtil.file("e:/test2Write.jpg"));
+		final byte[] bytes = ImgUtil.toBytes(ImgUtil.read("d:/test/logo_484.png"), "png");
+		FileUtil.writeBytes(bytes, "d:/test/result.png");
 	}
 	
 	@Test