note aes1972 --->What does the preprocess sub do?<br> <br> It sorts the directory results so that the unpadded sequences comes back in the correct order. Without it the sequence comes back looking like this: <code> image_sequenceA.1.tif image_sequenceA.11.tif image_sequenceA.12.tif image_sequenceA.13.tif image_sequenceA.14.tif image_sequenceA.15.tif image_sequenceA.16.tif image_sequenceA.17.tif image_sequenceA.18.tif image_sequenceA.19.tif image_sequenceA.2.tif image_sequenceA.20.tif image_sequenceA.3.tif </code> Which would make the sequence detection incorrect. It also handles the cases where there are files with the same name but different extension like this:<br> <br> <code> image_sequenceA.1.tif image_sequenceA.2.tif image_sequenceA.3.tif image_sequenceA.1.exr image_sequenceA.2.exr image_sequenceA.3.exr </code> So the preprocess sub is necessary in my case unless I can do the same sort somewhere else 1014360 1014365