Hi Wim Willems
do it in a different, easier way - when you align JPGs, then create and put the TIFFs or PNGs in a separate folder, then open the RCPROJ file in any text editor ( Edit++ ) and replace the *.JPG extensions with *.TIF or*.PNG and save it. Don’t forget to make a BACK-UP SAVE before you start editing the RCPROJ file !!