snap image through Vision acquisition express, got a totally green image

[fangyiming2]

When I use Vision acquisition express to acquire a single image, it will show a totally green image. However, if I use "acquire continuous image", it will show normally. Please see the attachment what does the "totally green image" mean! 

[Hatef.fouladi]

try to test this by max and
also do some thing else when you grab a single image try to do it several time continuously if the second or third image become clear it is problem on your cameras ccd electrical shutter to start

[fangyiming2]

well, it seems that still doesn't work. I also tried to snap continuously, but the second or third was still the green image. 

[fangyiming2]

sorry, i uploaded the wrong snapshot in the last reply. this one is right 

[Gregory]

It looks like your video mode and pixel format are not correct. BGRA is a 32-bit value which has RGB and alpha. YUY2 uses 16-bit values and I'm not sure that it has alpha. Try playing with those, or post screenshots showing all the available video mode and pixel format choices.

[fangyiming2]

video modes have only YUY2, and the pixel format has only BGRA 8 PACKED as well

[fangyiming2]

its still doesnt work..

[Gregory]

What about the output image type?

[fangyiming2]

it is the .PNG - RGB (32-bits) 

[Gregory]

What are the choices though?