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>>409231 Image quality is based on the amount of detail that can be packed into a space on the image. If you want more detail on 35mm film, then all details have to become smaller and sharper to fit on the fixed physical space on the film. If you want more detail on a digital image, then the image size has to become bigger to fit more detail because pixels are a fixed minimum size and hold only one point of color.
http://www.sphoto.com/techinfo/dslrvsfilm.htm A very technical comparison of film and digital SLR camera output.
If none of that makes any sense, then follow these instructions: Grab a sheet of paper and a pencil. That's your model of 35 mm film. Try to draw a satellite image of your town so that all of the detail fits on the paper. It's hard to draw that much detail on one sheet of paper.
Then grab a stick of chalk and draw a dot on the sidewalk. That's your model of one pixel on a digital camera. Now draw a satellite image of your town using those dots, but you can use as much space as you like.
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