Photo Color Correction

Adobe Photoshop Tutorial

Step 1 - Levels

Layer > New > Adjustment Layer > Levels
Input Levels: 2, 1.17, 221
Red: 20, 1.06, 255
Green: 16, 0.99, 255
Blue: 0, 1.09, 235

This step using Levels made the picture brighter and corrected some but not all of the tonal problems, removing much of the muddy green and bringing out the richness of the blue water, as shown below.

Photo after color correction using Levels