In various GN4 versions there are various multi-crop workflows.
•wf_MultiCrop.xml (standard): it displays the multi-crop dialog box. No image format change.
•wf_AutoCrop.xml (MediaGallery and Drupal): it does not show the multi-crop dialog box as it receives the pubDest or the variantType to apply). Converts the image to Jpeg RGB after the crop.
•wf_ProcessMultiCropOutput.xml (Winchester): it does not show the multi-crop dialog box as it receives the xml with the crop data. Converts the image to Jpeg RGB before the crop.