Further to my last post (and possibly related to Ewald's complaints too) Why does my 7274 x 9985 RGB image (212743Kb of data by my calculations) result in the creation of a gimpswap which is up to 500Mb in size? The performance for such images seems adequate to me (can't compare PotatoShop because it refuses to load any of our larger images at all) but this is wasting a lot of active disk space :( Nick.