diff --git a/libtiff/tif_getimage.c b/libtiff/tif_getimage.c
index 5a24b5b..0c47564 100644
--- a/libtiff/tif_getimage.c
+++ b/libtiff/tif_getimage.c
@@ -2399,7 +2399,7 @@ PickContigCase(TIFFRGBAImage* img)
 			}
 			break;
 		case PHOTOMETRIC_YCBCR:
-			if (img->bitspersample == 8)
+			if ((img->bitspersample==8) && (img->samplesperpixel==3))
 			{
 				if (initYCbCrConversion(img)!=0)
 				{