Hey!<br><br>Whil writing the test code I found out that saving the array by itself doesn't cause the error. Only after summing two arrays it fails. <br> <br>import numpy as np<br>import skimage.io as io<br>io.use_plugin("freeimage", "imread")<br>one = np.ones([2048,2048],dtype=np.int32)<br>two = np.zeros([2048,2048],dtype=np.int32)<br>summation = one + two<br>io.imsave("test.tif",summation, plugin="freeimage")<br><div><br>&nbsp;not using the freeimage plugin in not failing.<br><br>Siggi<br></div>