Support Portal

Application /Product Knowledge

Gray-scale resolution of contrast sensors

Article No: KA-09821
Version: 1.0
Subject to change without notice
Shows what is meant by “Gray-Scale” in combination with contrast sensors
Related Products
contrast sensors

Table of Contents

General

What is the meaning of the gray scale for contrast sensors?

 

The grayscale resolution is an important performance feature for contrast sensors.

The number of "gray-steps" indicates how many shades of gray the specific sensor type can distinguish between black and white.

Example for a 25-step gray-scale

Condition:

  1. Contrast sensor with teach-in:
    The minimum contrast step with successful teach-in result.
  2. Contrast Sensor with potentiometer setting:
    The minimum contrast step which can be adjusted using the sensors potentiometer.

 

Here you can find an overview of performance classes of commercially available contrast sensors:

 

Number of gray steps Performance Level
< 10 restricted for high contrast print mark detection
10…20 enough for most standard print mark applications with sufficient contrast
> 20…30 standard performance for most contrast sensors
> 30 good for challenging low contrast applications
> 50 high performance contrast sensor for special demand applications

 

 
Keywords:
Gray Scale, gray-scale, contrast
Create request