Thank you for your answer, but .HDR refers to_ colour depth_, that is dynamic range being high. It has no bearing with the number of pixels. I have seen Studio accepts .hdr files for light effects but oddly enough not to produce this type of files as output. I use them extensively for renders from PoserPro and so have much more options in Paintshop Pro to do postwork. A bit of a disappointment because iRay must have the hdr info in order to work.