I found this tree while walking in a forest close to home. It called my attention because of the yellow/orange leaves in the sea of green (it was the end of spring).
I tried to emphasize the orange color and remove some chroma and exposure from the rest to make it stand out from the surroundings, but without looking too artificial. Any further ideas?
GIMP. I played with the red, blue and green curves to try and bring out the colours of the tree and a slight crop to get the tree trunk on the left to frame the picture.