Color and Luminosity. Real-World Color Correction Techniques By Lulie Talmor

COLOR-reHeader-RA

Introduction

Every now and then, an image comes along with complex color schemes that can be daunting to retouch. For such cases, isolating luminosity and color components of the image and tackling each one individually can be helpful.

First, we must define the terms we will be using.

Hue — another word for the specific pigment color, with a scale of a rainbow.

Hue

Saturation — the intensity or purity of a hue, with a scale of 100% pure color to grey.

Saturation

Color — Hue and Saturation combined.

Luminosity — the measurement of brightness, with a scale from white to black.

Luminosity

Luminosity

If you refer to the image below and examine the cube and the lime, you will find that the areas darkened under a shadow to be desaturated whereas the areas facing the light source are significantly more saturated. There is a gradient from saturation to desaturation that correlates with the well lit to shadowed areas, with the exception of catch light which is pure white and therefore desaturated.

color and luminosity ref1

retouching academy notes

If color gels are used in a photo shoot, the difference between a highlight and lowlight color (shadow) can be much more drastic and noticeable.

 

As a result of excessive Dodging & Burning in the real-world retouching, brightened shadows will often appear desaturated and darkened highlights overly saturated. To fix this problem and to help manage the image, isolating Luminosity from Color and working on the Color first can make things a lot easier. This is usually the point in your workflow after the majority of Dodging and Burning is done.

 

retouching academy notes

To better see the area I am working on, I tend to add a temporary Curves Adjustment Layer that I constantly adjust to reveal details that are otherwise more difficult to see. Also, make sure the subject stands out from the foreground as the well-lit areas tend to draw the eye’s attention.

 

Color

In situations when you need to sample an exact color (Hue and Saturation), creating a Color Map (Ref.1 – see the Color column) will help you get the most accurate results.

To do this, first duplicate your flattened image into a new layer.

 

step1-duplicate original

 

Set the Blending Mode of this new layer to Color.

 

step2 - set to color

 

Create a new layer between the original and the Color layer. Fill this new layer with 50% gray (or RGB = 128, 128, 128).

 

step3- grey layer

Merge layers “Color”, and “50% Grey” together. The resulting layer is the completed a Color Map of your image,  which when you need to extract an exact color, is ready for you to sample from.

 

step4- merge

 If you would just like to view the color map temporarily and don’t need a flattened copy, then simply make a 50% grey layer over your image, and set to luminosity.

 

Color Corrections In The Real-World Retouching

When the comes time for color corrections to be made, the best way to achieve natural looking results is by painting with a low Opacity Brush on an empty layer set to the Color Blending Mode. I prefer the results from this technique over others because most of the natural color variations are preserved.

First, make a new layer on top of your file and set the layer mode to “Color”.

color 5 set to color

Next, sample from extreme points in your image’s color range, as sourcing from the image’s natural color pallete achieves better results. Here’s where you could use a Color Map we just talked about above, if you wanted to sample exact colors.

 

color-sampling-gif

 

Then select the Paint Brush tool, set its Opacity to 10%, and paint on the empty color layer.

Below you will see the Color layer used in the example, with a neutral 50% grey layer placed underneath.

 

color 4 color layer

 

The following GIF file cycles between:

Image 1: Retouched image original colors
Image 2: Color layer adjustments
Image 3: Retouched image after color corrections are applied

Look closely, as the changes are intentionally minor.

 

color-color-layer-gif

 

Keep in mind that this technique is meant for slight adjustments only, so use carefully!

If you enjoyed this article make sure to check out our upcoming Beauty Retouching: Skin & Skin Tones, Online Weekend Workshop by Lulie and Julia KuzmenkoSpaces are limited as we only accept 15 students per workshop to increase the amount of time we can devote to each assignment submission. 

STARTS on July 12th 2014  ENDS on July 13th, 2014

In this online weekend workshop Julia and Lulie will explore the key high end retouching techniques for achieving flawless yet naturally looking skin in beauty, fashion and portrait photography.

Beauty Retouching: Skin & Skin Tones

 

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