Apparently, there is a public domain plug-in available for Photoshop on the Mac which will allow bidirectional conversion between RGB and HSB/HSL modes. Does anyone know of a site for it please? _____________________________________________________________________________ Kevin Pedley, e-mail:[log in to unmask] Physiology Group, Phone: 010-44-71-333-4599 King's College London. Fax: 010-44-71-937-7783 Campden Hill Road, London W8 7AH. _____________________________________________________________________________