TomRaynor

Cool thanks very much. And one more thing - What do V and L actually stand for in the equation?

Sorry for the potentially silly question but how do I even run this hscript?
I have tried going to the houdini help but I cant seem to be able to follow what they are saying.

I have tried saving your code into a “.cmd” file.
Then (on windows) I open up a command prompt, and “cd” into the file's location. Then I try typing something like:

recToLin.cmd recToLin_v01.lut

my thinking was that the first part is running the cmd file and the second part (“recToLin_v01.lut”) is the arguement that I am trying to pass in. All it seems to do is create a file called $outname that is 1KB in size. It doesn't seem to behave correctly.

Am I doing something wrong? Could someone please give me a nudge to get me on the right track for how to make this “.lut” file? And maybe even just add it as an attachment to their reply as well

Thanks!

Just to be sure, what if I wanted to make a function that converted an image in a rec709 colour space to a linear colour space, then what would the function be? i.e. what is the inverse of rec709?

Thanks!