in news:5c457919$1@news.povray.org Thomas de Groot wrote:

> note: I am not going to re-read that loooooooong thread...
> 
> 

It's in the docs, but not where you expect it. 
http://wiki.povray.org/content/Reference:File_Output_Options

Should appear in a few more places imo, like:
http://wiki.povray.org/content/Reference:Color_Expressions#Dot_Item_Access
_for_Colors

And it appears that .hf = (Red + Green/255)*0.996093 not the same as .gray 
as I thought.

http://wiki.povray.org/content/Documentation:Tutorial_Section_3.2
#Noise_and_pigment_functions
The only appearence of .hf I could find,

ingo

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