File size is important when you are trying to make an image available on-line because it has to be good quality enough that it’s useful, but small enough that it can be loaded into a browser without having the patron wait. Also, if you want to archive the images, then you want a high quality archival image without being too hefty on memory. There are a few things that affect file size: The type of file affects file size. See the post about file types . Whether you are saving in full color, grayscale, or black and white also affects it. Typically, full color images are going to be large files. Grayscale is slightly smaller, but still much greater than black and white. However, you have some options when saving in full color or grayscale. 8 Bit or 24 bit Color/Grayscale You can save a color or grayscale image as either 8 bit or 24 bit color or grayscale. 8-bit 8 bit means that there are 8 bits that describe each pixel. This means that you have 256 different combination of bits to s...
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