Hi, I would like to know if there is a simple way of converting the bit depth of an image in ENVI. I am used to using ArcGIS products, but we have recently received ENVI 5.3 and are still getting used to this product, so it may be a case of different terminology between the programs or they way I'm looking at it but help would be appreciated. We need to convert 100's of images (TIFF format) from 16-bit to 8-bit and it is a slow process. I'm hoping we can take advantage of ENVI's 64-bit operating environment to perhaps speed this up. However, there appears to be a distinct lack of options and control over the output from the File>Save As.. command, at least as opposed to what I'm used to with Arc products. I've seen the article on 'WRITE_TIFF' using IDL directly, and am hoping to avoid this as it may introduce human error when applying it to 100's of datasets. Is there a simple way to do this task and is the ENVI 64-bit program likely to be any faster than ArcGIS's current 32-bit environment so much so that it would be worth the effort? Many thanks, Gerard