Underwater Photo Retouching

Underwater Photo Retouching with Photoshop
(underwater, photoshop, underwater tutorial,color,underwater color spectrum, retouching,photography)

One of the most common underwater photography difficulties is trying to capture a photo without extreme color and contrast loss. In this Photoshop Tutorial, you'll learn how to analyze and restore the color and contrast of underwater photos.

Introduction :

With increasing depth underwater, sunlight is absorbed, and the amount of visible light diminishes. Because absorption is greater for long wavelengths (red end of the visible spectrum) than for short wavelengths (blue end of the visible spectrum), the colour spectrum is rapidly altered with increasing depth. White objects at the surface appear bluish underwater, and red objects appear dark, even black. Although light penetration will be less if water is turbid, in the very clear water of the open ocean less than 25% of the surface light reaches a depth of 10 m (33 feet). At 100 m (330 ft) the light present from the sun is normally about 0.5% of that at the surface.

To illustrate, I’ve recreated how some common items would look at different depths.Notice how the red is removed from the orange, leaving a little color while the blue text is unaffected.
more info on :
http://www.thedivingblog.com/colors-underwater/