The following is a guest post by Barry Wheeler, Digital Projects Coordinator, Office of Strategic Initiatives
In part 1 of this blog series, we saw that manufacturers claimed “resolution” is based on the number of steps per inch a small motor moves the scanner assembly (the rows) and the number of tiny sensors per inch the manufacturer puts on the assembly (the columns.) But the International Standards Organization does not consider this the scanner’s resolution. The ISO defines the steps and sensors as the “sampling” rate because the sensors can only attempt to measure (sample) the brightness at each point. The ISO defines “resolution” as the actual result on the screen, not the number of sensors and steps that attempt to read each point.
Source: The Signal