|
Title: Question about using curves Post by: Dromano on March 30, 2021, 01:06:45 PM I like the ability to add a correction curve, it's handy for linearizing and other fine tuning for my various paper types, etc.
I'm wondering if the "Apply to" : Neutral drop down menu setting is using the luminosity channel. While it doesn't matter for grayscale images, it would for color images. Thanks Title: Re: Question about using curves Post by: admin on March 30, 2021, 01:55:35 PM In a sense. Gray is defined (in any given image) by R=G=B so when the red, green, and blue values are equal, the color is considered neutral and your curves for the "Neutral" channel will be applied. As the RGB values start deviating from neutral, the curves for other channels will start blending in. For example, for color 128,128,128, it will use solely your curves defined when "Apply to" is set to "Neutral". If another color is 135,128,128 (slight red tint), it will be weighted so mostly the "Neutral" curve is applied but it will blend in some of the "Red" curve as well. And of course, if the original color is 128,0,0 (purely red), only the "Red" curve is applied. This gives blended coverage and avoids posterization between hues.
Regards, Mike |