Basic Techniques for Preparing Digital Images

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Unit 2 Color: 17 of 23

 A Little Wake Up Call from RR

Formula  1 for File Size
 File Size = (pixel dimensions x bit depth) / 8

Formula 2 for File Size
 File Size = (length in inches x width in inches x dpi2 x bit depth) / 8

Example: an image with pixel dimensions of 1600x1200 and an 24-bit color depth has a file size of 1600*1200*24 / 8 = 5,760,000 bytes. 

Example: an 8 inch by 10 inch document  scanned at 100 dpi and a bit depth of 24 has a file size of 8*10*100*100*24 / 8 =   6,400,000 bytes.

 

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