The only dcr to 8bps conversion that makes sense would be perhaps the export of Kodak Digital RAW photographs to Photoshop format, or import of these raw files to Photoshop itself. In both cases this should be actually possible, since Kodak DCR format is supported, but of course you will require Photoshop for that. Maybe other photo editors might be of help as well, but these usually save just to PSD and not version specific graphics files.
Updated: August 4, 2023