jpeg - How to check if bunch of jpg files are black with C# -

so have program scans cameras multiple sources , takes thumbnail of view @ time , saves them jpg's.

i scan these through c# program , check if of created jpg files black (either obstructed, or no signal in case).

i wondering best way of solving problem. not color depth issue.

thanks!

use getpixel(x,y) function check color @ x,y location. can iterate through whole image , if they're black it's black. can check if majority of pixels gray / black - if it's dim image.