Documentation for blend_mode and blend_gamma? (Message 1 to 3 of 3)
From: William F Pokorny
Subject: Documentation for blend_mode and blend_gamma?
Date: 18 Nov 2016 15:43:52
Message: <582f6808$1@news.povray.org>
Christoph mentioned blend_mode elsewhere today. To my knowledge the two
options blend_mode and blend_gamma are not yet in our documentation for
3.7.1 and should be I think.
From the commit there is this:
Implemented non-linear colour and pigment map interpolation.
The syntax is changed as follows:
COLOR_MAP:
color_map { COLOR_MAP_BODY } | colour_map { COLOR_MAP_BODY }
COLOR_MAP_BODY:
COLOR_MAP_IDENTIFIER | [blend_mode INT] [blend_gamma FLOAT]
COLOR_MAP_ENTRY...
PIGMENT_MAP:
pigment_map { PIGMENT_MAP_BODY }
PIGMENT_MAP_BODY:
PIGMENT_MAP_IDENTIFIER | [blend_mode INT] [blend_gamma FLOAT]
PIGMENT_MAP_ENTRY...
The possible values for blend_mode are as follows:
0 (default): Colour interpolation is performed working gamma
space as defined by assumed_gamma.
1: Colour interpolation is performed in linear colour space.
2: Colour interpolation is performed in the gamma space defined
by blend_gamma (defaulting to 2.5).
3: Chromaticity interpolation is performed in linear space,
while brightness interpolation is performed in the gamma space defined
by blend_gamma.
Sorry about the wrapping.
Bill P.
From: Jim Holsenback
Subject: Re: Documentation for blend_mode and blend_gamma?
Date: 19 Nov 2016 09:45:24
Message: <58306584$1@news.povray.org>
On 11/18/2016 3:43 PM, William F Pokorny wrote:
> Christoph mentioned blend_mode elsewhere today. To my knowledge the two> options blend_mode and blend_gamma are not yet in our documentation for> 3.7.1 and should be I think.
http://wiki.povray.org/content/Documentation:Tutorial_Section_1#Version_3.7.1
btw: thanks for pulling the necessary info into your previous post ...
made the task /much/ easier :-)
From: William F Pokorny
Subject: Re: Documentation for blend_mode and blend_gamma?
Date: 19 Nov 2016 14:45:37
Message: <5830abe1$1@news.povray.org>
On 11/19/2016 09:45 AM, Jim Holsenback wrote:
> On 11/18/2016 3:43 PM, William F Pokorny wrote:>> Christoph mentioned blend_mode elsewhere today. To my knowledge the two>> options blend_mode and blend_gamma are not yet in our documentation for>> 3.7.1 and should be I think.>> http://wiki.povray.org/content/Documentation:Tutorial_Section_1#Version_3.7.1>>> btw: thanks for pulling the necessary info into your previous post ...> made the task /much/ easier :-)>
Thanks Jim, Looks good.
As I looked over these updates I did notice we still have statements
for the *_maps sections like:
"There may be from 2 to 256 entries in the map."
I believe Christoph eliminated that limit in the 3.7.1 master. Commit
cf1c3fb :
Refactored blend map handling
Removed the hard-coded limit of 256 blend map entries along the way.
...
Bill P.
