Thank you, Chris.

Works perfect!

One more newbie question about the gray level or color calculation of the
POV for precision:

In order to get higher precision output such as 16 bit/color PNG, what
parameters should be adjusted?
For example, do I better change the adc_bailout value from 1/255 default to
1/65000?
Are there any to be changed accordingly?

Jong

"Christoph Hormann" <chr### [at] gmxde> wrote in message
news:3D36912B.3CC46F12@gmx.de...
>
>
> Jong wrote:
> >
> > Dear all,
> >  I'd like to save my raytraced image as 16bit/color PNG and eventually
> > convert the PNG into either 16bit grayscale PNG or 16bit grayscale TIF,
> > which would result in a range of zero to 65,535 steps in gray level.
...
> > it as 16bit grayscale PNG or 16bit grayscale TIF?
>
> When you use '+fn16' you will get a 3x16 bit rgb PNG file.  When
> specifying 'hf_gray_16 on' in global_settings you will always get a 16 bit
> grayscale PNG with '+fn'.  Same applies for PPM (+fp).
>
> Christoph
>
> --
> POV-Ray tutorials, IsoWood include,
> TransSkin and more: http://www.tu-bs.de/~y0013390/
> Last updated 15 Jul. 2002 _____./\/^>_*_<^\/\.______

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