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cannot project 8 Bit Depth in the Pattern Sequence mode

Hi,

I am trying to project 8 bit depth fringe images using the pattern sequence mode, but it always shows binary. 

So I use the following figure to test. 

  

Here is my setting:

Only region 1 is bright. 

I also use static image mode to project the image. It works correctly. 

Why does this happen? How can I project 8 bit image in the pattern sequence mode?

Thank you!

Huang