Use render to disk. Set your print resolution first then type the inch dimensions. Bryce will calculate the number of pixels. If you type the inches first then change the resolution from default 72 to 300 bryce will rescale the inches. Once you set this up it is a good idea to change the name of the bitmap file you want to save to something else like the name plus RTD (render to disk). Otherwise, bryce will try to save a huge bmp render over the regular render that loads with your bryce br5 file. This can make it extremely slow the next time you try to open your bryce file. In the image shown I would name the saved butmap chartrezcathedralrtd.bmp. When I look in the bryce directory that has the file I will find the chartrezcathedral.br5 the chartrezcathedral.bmp (800x600pixels) and the chartrezcathedralrtd.bmp (7500x5625pixels)