Multiple Grayscale Image Upload and Projection Issue

[ArynnOGallegos]

Hello!

Thanks so much for providing this code!

I am encountering an issue when I try to grayscale patterns to the DMD. Rather than each pattern displaying as grayscale, I see the individual bitplanes projected in sequence. I have specified that the bit depth of each pattern is 8 bits, for example:
DMD.SeqAlloc(nbImg=num_images, bitDepth = 8)

Do you know what the problem might be?

Thanks for your time and help.

[wavefrontshaping]

Hi,

DMDs do not do grayscale, they only have two states: "on" and "off".

Grayscale mode just means that it will project a sequence of bitplanes over which the pixel will be "on" and "off" with a ratio corresponding to the grayscale value.

It makes sense for video projectors as the period is shorter than the persistence of vision. So "on" half of the time will be seen by our eyes as half the intensity.

To do real grayscale, you can do some Fourier plane filtering.