Forums > Jitter

float video


arcadeperfect
Sep 30 2010 | 1:23 am

hi,

is it possible to process video in float?

since movie files are never float, how can i convert a char matrix into a float one? and will i have to convert the result back into char in order to view in a window?

thanks,

Alex


awdriggs
Sep 30 2010 | 3:31 am

Just make a jit.matrix that is of type float32. Connect that matrix to a jit.pwindow or jitwindow. easy as that. of course all values will be from 0 to 1 instead of 0 to 255.

why do you want float values?

Here is a quick example…cellblock is being used to display the values of each cell for each plane.



-- Pasted Max  Patch, click to expand. --

arcadeperfect
Sep 30 2010 | 12:09 pm

thanks thats perfect

so the pwindow / window automatically interprets 1 as white instead of 255, thats useful.

i want float because it makes the maths easier when using simple + and * operators to mix images together. also, i want to be able to use negative values in the matrices.

im a compositor by day and float makes more sense to me…

anyway thanks!


awdriggs
Sep 30 2010 | 5:08 pm

when doing operations…jit.op makes life much better and is less processor intense as the normal max operations. You can also use jit.expr instead of stringing a bunch of jit.op together. There is a good tutorial on jit.expr by andrew benson on the cycling website.

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