Dalsa Genie HM640 User Manual page 67

Important: In this example, the average pixel value for the frame is close to black. Also note that most sensors
will show a much higher maximum pixel value due to one or more "hot pixels". The sensor specification accounts
for a small number of hot or stuck pixels (pixels that do not react to light over the full dynamic range specified for
that sensor).
Verify a Bright Acquisition
Aim the camera at a diffused light source or evenly lit white wall with no shadows falling on it. Using CamExpert,
click on the grab button and then the histogram button. Use the lens iris to adjust for a bright gray approximately
around a pixel value of 200 (for 8-bit pixels). The following figure shows a typical histogram for a Genie grabbing a
bright gray image.
Genie HM-HC Series-GigE Vision Camera
Indicates one or more
"hot" pixels
Average dark pixel value
Operational Reference  65