diff --git a/library/src/main/ets/downsampling/DownsampleStartegy.ets b/library/src/main/ets/downsampling/DownsampleStartegy.ets
index 50387f0..e42861b 100644
--- a/library/src/main/ets/downsampling/DownsampleStartegy.ets
+++ b/library/src/main/ets/downsampling/DownsampleStartegy.ets
@@ -152,13 +152,11 @@ export class CenterInside implements BaseDownsampling {
       width: round(Math.min(1, getScale(sourceWidth, sourceHeight, requestedWidth, requestedHeight, downsampType)) * sourceWidth),
       height:round(Math.min(1, getScale(sourceWidth, sourceHeight, requestedWidth, requestedHeight, downsampType)) * sourceHeight)
     }
+    //将整型的缩放因子转换为2的次幂采样大小
     let scaleFactor = this.getSampleSizeType(sourceWidth, sourceHeight, requestedWidth, requestedHeight,
     downsampType) == SampleSizeRounding.QUALITY ?
-    Math.max(sourceWidth / outSize.width, sourceHeight / outSize.height) :
-      Math.min(sourceWidth / outSize.width, sourceHeight / outSize.height) //重新计算宽高比
-
-    scaleFactor = Math.max(1, highestOneBit(scaleFactor))//将整型的缩放因子转换为2的次幂采样大小
-
+    Math.max(1, highestOneBit(Math.max(sourceWidth / outSize.width, sourceHeight / outSize.height))) :
+    Math.max(1, highestOneBit(Math.min(sourceWidth / outSize.width, sourceHeight / outSize.height)))
     if (this.getSampleSizeType(sourceWidth, sourceHeight, requestedWidth, requestedHeight, downsampType)
       == SampleSizeRounding.MEMORY  && (scaleFactor < (1 / Math.min(1, getScale(sourceWidth, sourceHeight, requestedWidth, requestedHeight, downsampType))))) {
       scaleFactor = scaleFactor << 1;