Forum: Poser - OFFICIAL

Subject: Why I don't like gamma correction somtimes

Winterclaw opened this issue on May 07, 2010 · 16 posts

Winterclaw posted Fri, 07 May 2010 at 10:18 PM

I had spent an hour working on a shader for stockings.  I was starting to get kinda happy with the look of it when out of curiosity I loaded up a gamma correction lens in poser and here's what I get.  Talk about argh!!! moments.  :scared: 

Looks like I'm back to square 1.  ;)

WARK!

Thus Spoketh Winterclaw: a blog about a Winterclaw who speaks from time to time.

 

(using Poser Pro 2014 SR3, on 64 bit Win 7, poser units are inches.)

hborre posted Fri, 07 May 2010 at 11:10 PM

Okay, this is when we get to ask you which version did you use?

And if it's not the Pro series, why aren't you using gamma correction in your shaders?

'nuff said.

Winterclaw posted Fri, 07 May 2010 at 11:16 PM

I'm using  poser 7 and I'm not sure how to properly add GC to a shader.  Do I just plug them into the alt diffuse node?

WARK!

Thus Spoketh Winterclaw: a blog about a Winterclaw who speaks from time to time.

 

(using Poser Pro 2014 SR3, on 64 bit Win 7, poser units are inches.)

hborre posted Fri, 07 May 2010 at 11:34 PM

Sometime ago, Bantha put together a gamma correction python script which installs the necessary shader nodes.  They do plug into the alt_diffuse of the root node.  Very convenient and handy.  Used it several times in P8 before PP 2010.  I thought it was posted in the free section, but haven't found it.  I do know it was posted here in the forum last year.  Perhaps, if you get in touch with him, he would be more then happy to release it again.

And BTW, if you do begin to use it on a regular basis for everything, you will need to drop your light intensities.

Winterclaw posted Fri, 07 May 2010 at 11:42 PM

Okay, I was working from this [ thread](http://www.renderosity.com/mod/forumpro/showthread.php?thread_id=2738989&page=1) and managed to add GC to the stocking shaders.  However the shader there doesn't seem to work very well with nearly black colors... turns them white.

I'll look up that bantha script.  Also, what are good light levels?

WARK!

Thus Spoketh Winterclaw: a blog about a Winterclaw who speaks from time to time.

 

(using Poser Pro 2014 SR3, on 64 bit Win 7, poser units are inches.)

Winterclaw posted Fri, 07 May 2010 at 11:46 PM

The only workaround besides lighting is I have to turn diffuse down to almost nothing to get something to be dark.   However doesn't this kind of defeat the point of having a separate color node?

Is there something important I'm missing here?

WARK!

Thus Spoketh Winterclaw: a blog about a Winterclaw who speaks from time to time.

 

(using Poser Pro 2014 SR3, on 64 bit Win 7, poser units are inches.)

kobaltkween posted Sat, 08 May 2010 at 12:36 AM

 you're double correcting and not linearizing, i think.  the first power function should be to 2.2, not 1/2.2. 


IsaoShi posted Sat, 08 May 2010 at 6:39 AM

Quote -  you're double correcting and not linearizing, i think.  the first power function should be to 2.2, not 1/2.2. 

Precisely so. Plug the output of Math_Functions_3 directly into Value 2 of Color_Math_4. Change nothing else until you've rendered that!

Edit: well, you could put the Diffuse_Value back to what it was originally...

"If I were a shadow, I know I wouldn't like to be half of what I should be."
Mr Otsuka, the old black tomcat in Kafka on the Shore (Haruki Murakami)

IsaoShi posted Sat, 08 May 2010 at 6:42 AM

Quote - Also, what are good light levels?

I strongly recommend bagginsbill's Lightmeter V2 to check and adjust scene light levels.

"If I were a shadow, I know I wouldn't like to be half of what I should be."
Mr Otsuka, the old black tomcat in Kafka on the Shore (Haruki Murakami)

basicwiz posted Sat, 08 May 2010 at 8:22 AM

And where, pray tell, would one find said light meter? (I don't see it on his site.) I would KILL for such a device! 

WandW posted Sat, 08 May 2010 at 9:04 AM

Please, don't kill me...

sites.google.com/site/bagginsbill/file-cabinet

----------------------------------------------------------------------------------------

The Wisdom of bagginsbill:

"Oh - the manual says that? I have never read the manual - this must be why."
“I could buy better software, but then I'd have to be an artist and what's the point of that?"
"The [R'osity Forum Search] 'Default' label should actually say 'Don't Find What I'm Looking For'".
bagginsbill's Free Stuff... https://web.archive.org/web/20201010171535/https://sites.google.com/site/bagginsbill/Home

basicwiz posted Sat, 08 May 2010 at 9:29 AM

 Thank you!

Now. How does one use it? There are no instructions. :(

Winterclaw posted Sat, 08 May 2010 at 9:49 AM

Thanks kobalt and Isao... that's what I get for trying to build nodes so late at night.

WARK!

Thus Spoketh Winterclaw: a blog about a Winterclaw who speaks from time to time.

 

(using Poser Pro 2014 SR3, on 64 bit Win 7, poser units are inches.)

Winterclaw posted Sat, 08 May 2010 at 10:06 AM

And here is the "proper" version.

WARK!

Thus Spoketh Winterclaw: a blog about a Winterclaw who speaks from time to time.

 

(using Poser Pro 2014 SR3, on 64 bit Win 7, poser units are inches.)

basicwiz posted Sat, 08 May 2010 at 10:36 AM

 Nevermind... found the thread.

hborre posted Sat, 08 May 2010 at 2:24 PM

Much better.  They rendered very well this time.