Size of scanned images

2008-03-19 2:16 am

how to calculate the size of a scanned image
for example,
color depth: 24-bit
picture size: 3.5'' x 4''
resolution: 100 dpi

plz list out the formula for calculation.

回答 (1)

多多利奧

2008-03-26 12:16 am

✔ 最佳答案

Number of dots of the scanned image
= width x height x dpi (dots per inch)
= 3.5 x 4 x 100
= 1,400 dots

For each dot, the color depth = 24 bit = 3 byte

Size of the image
= number of dots x color depth
= 1,400 x 3
= 4,200 bytes

2008-03-25 18:03:39 補充：
Area of the scanned image
= width x height
= 3.5 x 4
= 14 square inch

Number of dots of the scanned image
= height x dpi (dots per inch) x dpi
= 14 x 100 x 100
= 140,000 dots

For each dot, the color depth = 24 bit = 3 byte

Size of the image
= number of dots x color depth
= 140,000 x 3
= 420,000 bytes

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