On Wed, Mar 05, 2003 at 12:43:09PM -0700, Francis Zhou wrote: > if 5 1GB cards are equivalent to 20 rolls > of 36's number of images, that works out to about 7MB/pic, or 1 byte per > pixel at 6MP, is that number low? I thought you need at least 2 bytes for > true color (64k colors), more elaborate ones need 24 bits which is 3 bytes. > Is this 7MB/pic file compressed?
Indeed, Canon's raw format is compressed, but with lossless compression so nothing is lost (unlike in jpeg, which is lossy compression). That also means that file sizes will vary depending on the image and the 6.5MB figure is only an average. Images do compress rather predictably however so the average figure is probably good enough for most purposes, but the number of images that fit on an 1GB card will vary a little. -- Tapani Tarvainen * **** ******* *********************************************************** * For list instructions, including unsubscribe, see: * http://www.a1.nl/phomepag/markerink/eos_list.htm ***********************************************************
