# Large Images

The PMAlign tool cannot function on any portion of an image where any pixel has a coordinate value (along either the x-axis or y-axis) that exceeds 32767. This limitation includes the area of the image you use to train a pattern and the image itself, as well as any region of interest you might specify. If necessary, you can pass the input image to a One Image Tool with no image-processing operations. A One Image Tool can be configured to generate a smaller output image where no pixel has a coordinate value of 32767, and then this image can be used as the input image to the PMAlign tool.