Re: [Offtopic]| half lossy datatype

On 4/30/2014 2:08 PM, Gonzalo Garramuno wrote:
> I find myself with updating ffmpeg's exr reader (don't ask). One thing i
> am trying to do is add a gamma function to the reading of the format,
> with a gamma table.
> However, I find myself against a wall not being able to get the float
> and half float to behave correctly.  I end up with greens in places
> where there were negative values or nans.
> I am wondering if someone could take a look at these functions I am
> using to see if some bit is being set wrong.  Or if it is indeed
> impossible to have half->float->half (as done in my filling of the
> table) mantaining the same values (with gamma 1.0).

pow() doesn't like negative values, and I've seen different results on 
different machines. You should clip negatives before calling it.