Microtek ArtixScan 4500t Reference Manual page 124

If you select Native color mode as your display, the Color Meter options let you
choose whether you wish to display color information in numbers or
percentages.
• If Value is chosen, the numbers represent values in the 0-to-255 pixel scale
regardless of the bit depth of your output image. For instance, an R value of
23 indicates that the sampling size selected has a red color value of 23. Value
is calculated by multiplying the percentage by the constant 255 (value = 255
x percent).
• If Percent is chosen, the numbers represent percentage of intensity (divided
by 255). For instance, a G value of 35% indicates that the sampling size
selected has a green color value to be 35 percent intense (out of 100
percent). Percent is calculated by dividing the constant 255 by the value
(percent = V/255). For CMYK images, the display is always in Percent.
Reference: The Information Window 117