Sirs,

Thank you for all informative advices.

> >  From your picture view, the png file you got is correct and cannot
> > perform better due to the compact values used with +FN8 and the gamma
> > you specified for file (or its default of 2.2);
>
> Indeed. (Given that no dithering is performed, that is.)

I should have known it when difference is 1/256.
Please forgive my bonehead.

> > You might want to (either or both):
> >   * Use deeper PNG (+FN16 is the max)
>
> You might still get color banding there depending on the image viewer.
>
> >   * experiment with dithering (+TH or +THfs or +THB2 or +THB3 or +THB4 or
> > +THD1 or +THD2 )
>
> Yep, probably the best approach.

I will try dithering. It's likely appropriate for my project.

> >   * Use deeper PNG (+FN16 is the max)
>
> You might still get color banding there depending on the image viewer.

But I would like to paint 16 bits deep rich darkness someday...

Thanks again,

Post a reply to this message