fix bug

pcloud-common/src/main/java/com/pcloud/common/utils/PictureUtil.java

@@ -37,10 +37,11 @@ public class PictureUtil {
 
 
     public static Color getImagePixel(BufferedImage bi)  {
-        if(bi.getWidth()*bi.getHeight()>10000) {
-            BufferedImage pic1 = new BufferedImage(350, 350, BufferedImage.TYPE_3BYTE_BGR);
+        if(bi.getWidth()*bi.getHeight()>500000) {
+            BufferedImage pic1 = new BufferedImage(157, 224, BufferedImage.SCALE_SMOOTH);
             Graphics graphics = pic1.getGraphics();
-            graphics.drawImage(bi.getScaledInstance(350,350,Image.SCALE_SMOOTH),0,0,null);
+            graphics.drawImage(bi.getScaledInstance(157,224,Image.SCALE_SMOOTH),0,0,null);
+            graphics.dispose();
             bi = pic1;
         }
         int width = bi.getWidth();
@@ -173,7 +174,7 @@ public class PictureUtil {
         StringBuilder builder = new StringBuilder(
                 Integer.toHexString(number & 0xff));
         while (builder.length() < 2) {
-            builder.append("0");
+            builder =new StringBuilder("0").append(builder);
         }
         return builder.toString().toUpperCase();
     }