POV-Ray : Newsgroups : povray.binaries.images : assumed_gamma, overlapping textures and transmit. : Re: assumed_gamma, overlapping textures and transmit. Server Time
3 May 2024 06:26:36 EDT (-0400)
  Re: assumed_gamma, overlapping textures and transmit.  
From: William F Pokorny
Date: 19 Oct 2016 06:20:24
Message: <580748e8$1@news.povray.org>
On 10/18/2016 02:36 PM, clipka wrote:
> Am 18.10.2016 um 18:29 schrieb William F Pokorny:
>
>> The non-linear behavior of transmit in the ag 2.2 case is often helpful
>> to the final appearance of layered textures - the gray out region is
>> tighter. When trying to map a 2.2 texture say from Norbert's collection
>> into my ag 1.0 working space, I start by converting any rgb colors to
>> srgb (bottom row), but that is usually not enough if the transmit value
>> in any part of the texture is not 0.0 or 1.0.
>
> Your example uses very unsaturated colours; to get the full picture, you
> should also try the same experiment with highly saturated colours. I can
> imagine that you'll come to different conclusions there.
>

Will put it on the todo list - would suppose I'd notice the greying 
transitions less in such an experiment. The image used was one where I'd 
struggled with transparent textures and getting a "blend" between 
textures that I wanted.

>
>> Aside: I have been wondering for a while about a more probabilistic
>> pixel based transmit mode for blending overlapping textures. Might such
>> an approach help with the dulling/graying of overlapping partly
>> transparent textures...
>
> What do you mean by "probabilistic pixel based transmit mode"?
>
I have in mind some sort of sampling between textures weighted by the 
transmit values involved. Suppose somewhat like the blending which 
happened in the tilt shift image I posted recently. I admit though, I'm 
thinking aloud.

Bill P.


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