Adding More Color
This is a pretty simple way to recover color. First duplicate the layer.
Layer > Duplicate Layer
On duplicated layer we will work. Go to:
Image > Adjust > Hue/Saturation
Hue = 0 -
Saturation = 50 -
Lightness = 0 -
Colorize = Disabled
Remember that we are working on the copy.
Now apply the following filter:
Filter > Noise > Median -
Radius = 4 px
And next blur a little more:
Filter > Blur > Gaussian Blur -
Radius = 3 px
This is the whole trick.
Now change this layer to Mode Color.
If you want a little more color, continue adjusting:
Image > Adjust > Curve
Once there press the Auto Button.
In this image was applied and it improved a little more. Although it is already too much color, but that it is the objective of this tutorial.