diff --git a/I2_NeuronalerAbsturz/Start_Mac/imageInputTests.c b/I2_NeuronalerAbsturz/Start_Mac/imageInputTests.c
index 699b39b..4a52400 100644
--- a/I2_NeuronalerAbsturz/Start_Mac/imageInputTests.c
+++ b/I2_NeuronalerAbsturz/Start_Mac/imageInputTests.c
@@ -19,7 +19,7 @@ static void prepareImageFile(const char *path, unsigned short int width, unsigne
         {
             for(unsigned int i = 0; i < (numberOfImages * width * height); i++)
             {
-                buffer[i] = (GrayScalePixelType)i;
+                buffer[i] = (GrayScalePixelType)(i & 0xFF);
             }
 
             fwrite(fileTag, sizeof(fileTag[0]), strlen(fileTag), file);