Open the settings for the Diffraction Image Analysis window and change “Data Type” to Raw Image (no diffraction). This displays the source that we are going to image through the Cooke triplet, a three bar target. It is important to keep in mind that, in principle, any IMA file could be used:

Next, we are going to take a look at two extremes, a fully incoherent image of this source and then a fully coherent image. First, generate a perfectly incoherent image by changing “Data Type” to Incoherent Image. Notice that the resulting image shows the general blurring expected (as a result of diffraction) but no coherent interference:

Now, change “Data Type” to Coherent Image. Observe that the image now displays clear evidence of spatial interference, especially at the corners of the bars: