With this tutorial you can quickly and easily change the color of thousands of flowers in a field without altering anything else in the picture... and you can do this in under one minute.
This is the image we will be using.
Go to Select > Color Range
and select "Add To Sample"
(this button shown here)
Begin to click all the red/pink colors in the flower, the more you click all the different tints and tones of the flower's color... the more accurate your color transformation will be.
Click OK and you will notice all the flowers have been selected.
Copy and Paste this selection onto a new layer and name it "colored."
(Edit > Copy)
(Edit > Paste)
Go to Image > Adjustments > Hue/Saturation and move the Hue slider left and right until you find a color that you like.
This technique can be used for many things like changing the color of a car etc.