The change in the color of tree leaves in autum

Green plants makes its own food by a process called photosynthesis.Photosynthesis takes place in the presence of chlorophyl and sunlight according to the equation below:
6CO2  +   6H2O                                    C6H12O6
                      chlorophyl and sunlight

In autumn, however, changes in temperature and rainfall amounts cause trees to stop producing
chlorophyll. The chlorophyll already in the leaves undergoes a
chemical change into colorless chemicals.Where do the bright fall
colors come from? The pigments that produce fall colors have
been present in the leaves all along. However, in the summer,
chlorophyll is present in large enough amounts to mask these pigments.
In the fall, when chlorophyll production stops, the bright
pigments become visible.