Changing color values

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Changing color values

Postby coilbook » Sun Nov 19, 2017 10:44 pm

coilbook Sun Nov 19, 2017 10:44 pm
Hi
When we change saturation in color tab from 255 to 250 results dont get saved. If we change to like 255 to 240 they are saved. same apples with saturation near 1 and 255. values dont get saved. is it max bug? Video attached
Attachments

[ Play Quicktime file ] colro values.MOV [ 1.42 MiB | Viewed 725 times ]

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Re: Changing color values

Postby coilbook » Sun Nov 19, 2017 10:54 pm

coilbook Sun Nov 19, 2017 10:54 pm
it looks like problem with 3ds max curves. they do not move until value is 248 for saturation. So it moves in 7s Why is this?
Attachments
values.jpg
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Re: Changing color values

Postby neonZorglub » Mon Nov 20, 2017 1:08 am

neonZorglub Mon Nov 20, 2017 1:08 am
Hi Coilbook,

This is just a result of numerical conversion done by max ..
The color is stored and used internally as RGB.. : if it doesn't change, it won't be saved ..
The Hue, Sat, Value version is just a temporary helper .. and for low RGB like your sample (20,2,0), several values of Sat gives the same RGB result..
So this is normal, and a result of the precision loss while converting with integer values of RGB ...
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Re: Changing color values

Postby coilbook » Mon Nov 20, 2017 3:24 am

coilbook Mon Nov 20, 2017 3:24 am
neonZorglub wrote:Hi Coilbook,

This is just a result of numerical conversion done by max ..
The color is stored and used internally as RGB.. : if it doesn't change, it won't be saved ..
The Hue, Sat, Value version is just a temporary helper .. and for low RGB like your sample (20,2,0), several values of Sat gives the same RGB result..
So this is normal, and a result of the precision loss while converting with integer values of RGB ...



Thank you !
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Re: Changing color values

Postby coilbook » Thu Nov 23, 2017 9:48 pm

coilbook Thu Nov 23, 2017 9:48 pm
neonZorglub wrote:Hi Coilbook,

This is just a result of numerical conversion done by max ..
The color is stored and used internally as RGB.. : if it doesn't change, it won't be saved ..
The Hue, Sat, Value version is just a temporary helper .. and for low RGB like your sample (20,2,0), several values of Sat gives the same RGB result..
So this is normal, and a result of the precision loss while converting with integer values of RGB ...



I got this reply on autodesk. Not sure if octane can do this one day

You got an reply in the thread you linked, that's not how it works - legacy shaders support 8-bit RGBA values, i.e. four integer values from 0 to 255, hence the limits. You shouldn't use them if you want higher precision for any reason, use for example Arnold shaders, Vray color or anything else that supports floating point values:
Attachments
medium.jpg
medium.jpg (17.41 KiB) Viewed 690 times
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