Jump to content
  • Advertisement
Sign in to follow this  
Endemoniada

Gamma Midpoint/Offset ?

This topic is 1957 days old which is more than the 365 day threshold we allow for new replies. Please post a new topic.

If you intended to correct an error in the post then please contact us.

Recommended Posts

Hi guys,

 

I'm trying to implement a Levels algorithm like Photoshop. I think I have it all figured out except for one thing.

 

If the black and white points are 0.0 and 1.0 the midpoint is 0.5 and the gamma at that point in 1.0. The problem I'm having is if the midpoint is at (say) 0.375, how do I make it so that midpoint has a gamma of 1.0 ?

 

I'm doing it like this:

 

v=pixelValue // (0...1)
if(v < a)
 v=a;
else if(v > b)
 v=b;
else
 v=gamma(v); // the midpoint between a and b has a gamma of 1.0

 

Thank you.

 

 

Share this post


Link to post
Share on other sites
Advertisement
Sign in to follow this  

  • Advertisement
×

Important Information

By using GameDev.net, you agree to our community Guidelines, Terms of Use, and Privacy Policy.

We are the game development community.

Whether you are an indie, hobbyist, AAA developer, or just trying to learn, GameDev.net is the place for you to learn, share, and connect with the games industry. Learn more About Us or sign up!

Sign me up!