diff --git a/build_linux64/libamscppimglib4.linux64.a b/build_linux64/libamscppimglib4.linux64.a
index 2896382..c18cf65 100644
Binary files a/build_linux64/libamscppimglib4.linux64.a and b/build_linux64/libamscppimglib4.linux64.a differ
diff --git a/build_linux64/objstore/amscppimglib4_amsimage.o b/build_linux64/objstore/amscppimglib4_amsimage.o
index b5f9485..3e66396 100644
Binary files a/build_linux64/objstore/amscppimglib4_amsimage.o and b/build_linux64/objstore/amscppimglib4_amsimage.o differ
diff --git a/build_linux64/objstore/amscppimglib4_tests.o b/build_linux64/objstore/amscppimglib4_tests.o
index de569d8..0fc9a97 100644
Binary files a/build_linux64/objstore/amscppimglib4_tests.o and b/build_linux64/objstore/amscppimglib4_tests.o differ
diff --git a/build_linux64/tests b/build_linux64/tests
index 7a6c8cc..61411a9 100644
Binary files a/build_linux64/tests and b/build_linux64/tests differ
diff --git a/src/amscppimglib4/amscppimglib4_amsimage.cpp b/src/amscppimglib4/amscppimglib4_amsimage.cpp
index 934dd9f..e02f3a6 100644
--- a/src/amscppimglib4/amscppimglib4_amsimage.cpp
+++ b/src/amscppimglib4/amscppimglib4_amsimage.cpp
@@ -562,8 +562,8 @@ namespace ams
 
         for(I=I0;I<I1;I++)
         {
-            Ix = I0%img->Nx;
-            Iy = I0/img->Ny;
+            Ix = I%img->Nx;
+            Iy = I/img->Nx;
 
             img->data[0 + 4*(Ix + img->Nx*Iy)] = color.R;
             img->data[1 + 4*(Ix + img->Nx*Iy)] = color.G;
diff --git a/src/amscppimglib4/amscppimglib4_tests.cpp b/src/amscppimglib4/amscppimglib4_tests.cpp
index 0e00d3c..62fdbf0 100644
--- a/src/amscppimglib4/amscppimglib4_tests.cpp
+++ b/src/amscppimglib4/amscppimglib4_tests.cpp
@@ -46,6 +46,21 @@ namespace ams
         sprintf(fname2,"../testimg/test_transpose.png");
         write_image(fname2,&img2);
 
+        img2 = img;
+        img2.resize(img.Nx/2,img.Ny/2);
+        sprintf(fname2,"../testimg/test_resize.png");
+        write_image(fname2,&img2);
+
+        img2 = img;
+        img2.resize(img.Nx*2,img.Ny*2);
+        sprintf(fname2,"../testimg/test_resize2.png");
+        write_image(fname2,&img2);
+
+        img2.resize(200,100);
+        img2.setall(amspixel(0,255,0,255));
+        sprintf(fname2,"../testimg/test_green.png");
+        write_image(fname2,&img2);
+
 
 
         return;
diff --git a/testimg/test_green.png b/testimg/test_green.png
new file mode 100644
index 0000000..10ea146
Binary files /dev/null and b/testimg/test_green.png differ
diff --git a/testimg/test_resize.png b/testimg/test_resize.png
new file mode 100644
index 0000000..8eba59e
Binary files /dev/null and b/testimg/test_resize.png differ
diff --git a/testimg/test_resize2.png b/testimg/test_resize2.png
new file mode 100644
index 0000000..bb632d6
Binary files /dev/null and b/testimg/test_resize2.png differ