Can't get correct Binary Image from video

[murrdpirate]

I created a small VI that takes the first frame of a selected avi file, converts it into gray scale, and then attempts to convert the gray scale image into a binary image.  For some reason, the binary image just comes out all black (despite the gray scale image showing a very bright tennis ball).  

Here's a picture of my block diagram and front panel (with results): http://imgur.com/QxunT

I also attached my vi and video.  Any help is greatly appreciated, of course.

[Andrey_Dmitriev · Accepted solution]

The background gray value is something around 30...50 and ball is 150..220. So, try to use Range 100,250 in IMAQ Threshold instead of 0,1 - you will be surprised.

Andrey.

[murrdpirate]

You are exactly right.  I originally thought that was how it was supposed to be, but every reference I saw about creating binary images said to use 0 and 1.  Thanks!

[toto26]

Don't forget to use the Binary palette on your image display. This allows to see in black and red your binary image, otherwise you will see no visible difference between 0 and 1.