An inch has a specific size. An inch is, in fact, an inch long and all inches, are exactly the same size. Pixels themselves have no inherent size. They are more like points of reference or sets of numbers for an image. We can not see a pixel and so we must change it into something we can see.... A dot of sorts. The size of the dot will depend on how big we make the image and how many pixels there are to fill the space. Using a 640px X 480px file to make a 640" X 480" image will result in dots that are 1" X 1" in size. If you get far enough from the image so that you're eye cant resolve a 1" square dot, the image will look fine. On a monitor which is about 17" X 14", set to a resolution of, say, 1280 X 1024 dots per inch (About 72 pixels per inch), this image will fill about a 1/4 screen, thus it will appear 8.5" X 7" in size with square dots that are each about 1/72" in size. This is not a bad size for viewing images... about the same size as the images in the PF gallery. Herschel >>-----Original Message----- >>From: owner-photoforum@xxxxxxxxxxxxxxxxxx [mailto:owner- >>photoforum@xxxxxxxxxxxxxxxxxx] On Behalf Of Emily L. Ferguson >>Sent: Tuesday, March 11, 2008 7:52 PM >>To: List for Photo/Imaging Educators - Professionals - Students >>Subject: Re: Stupid question >> >>640x480 is the number of pixels in the image. It can be any number >>of inches, depending on how many pixels you define in an inch. >> >>I suggest defining the image as 1 pixel per inch. It will display on >>their projector just fine. The inches will be really tiny when they >>project it. >> >>Easier than bothering with the division. >>-- >>Emily L. Ferguson >>mailto:elf@xxxxxxxxxxxxxxxxxx >>508-563-6822 >>New England landscapes, wooden boats and races >>http://www.landsedgephoto.com >>http://e-and-s.instaproofs.com/
