How can I log image frames to disk with a 12-bit camera?

I am trying to log an avi file on disk using the following commands:

 logfile = avifile('hello.avi)

 logfile.Colormap = gray(256);

but I receive the following errors:

 ??? Error using ==> avifile.set>setColormap

 Colormap must no more than 256 entries.

 Error in ==> avifile.set at 43

     obj = feval(paramSetFcns{match},obj,values{i});

 Error in ==> avifile.subsasgn at 14

   obj = set(obj,param,value);

Answer 1

[MathWorks Support Team]

This enhancement has been incorporated in Release 2011a (R2011a). For previous product releases, read below for any possible workarounds:

The ability to log 12-bit video feeds from the Image Acquisition Toolbox to an AVI file on disk is not possible.

The workaround is to log the frames to memory and then write to disk using IMWRITE.