diff --git a/doc/py_tutorials/py_imgproc/py_thresholding/images/threshold.jpg b/doc/py_tutorials/py_imgproc/py_thresholding/images/threshold.jpg
index e203927791e209945680447d515812c543ca76e9..c7053cc76d59c9545598274275b62f3f0a68a6ba 100644
Binary files a/doc/py_tutorials/py_imgproc/py_thresholding/images/threshold.jpg and b/doc/py_tutorials/py_imgproc/py_thresholding/images/threshold.jpg differ
diff --git a/doc/py_tutorials/py_imgproc/py_thresholding/py_thresholding.markdown b/doc/py_tutorials/py_imgproc/py_thresholding/py_thresholding.markdown
index 285124d17c13e9b86c966a11a5ac0f848d2d2dce..05400988506ed16274686937ffe8bc28105b5f03 100644
--- a/doc/py_tutorials/py_imgproc/py_thresholding/py_thresholding.markdown
+++ b/doc/py_tutorials/py_imgproc/py_thresholding/py_thresholding.markdown
@@ -48,7 +48,7 @@ titles = ['Original Image','BINARY','BINARY_INV','TRUNC','TOZERO','TOZERO_INV']
 images = [img, thresh1, thresh2, thresh3, thresh4, thresh5]
 
 for i in xrange(6):
-    plt.subplot(2,3,i+1),plt.imshow(images[i],'gray')
+    plt.subplot(2,3,i+1),plt.imshow(images[i],'gray',vmin=0,vmax=255)
     plt.title(titles[i])
     plt.xticks([]),plt.yticks([])