I am creating a large (1700mm square) graphic that involves a very large photograph that I have edited in Photoshop. This image itself is over 350MB - I am using TIFF format as this is considerably smaller than psd (1,684MB!). I need transparency as it has to be put over the top of a background image underneath, so cannot use a format that doesn't support transparency. The finished indd. file is 33MB but when I try to convert it to a pdf I get a message "Out of memory". I have closed all other programs and have tried increasing the virtual memory allocation in the control panel - all to no avail. Can someone tell me either how I can reduce the size of the photoshopped image file without reducing its quality and/or how I can increase the memory available so that the pdf can be created. I am using a pc, Windows XP SP3, Adobe Indesign and Photoshop CS3. Thank you.