Perception is the interpretation of sensory information.
Look at the photo shown. You see the different colors because light reflected off of the photo enters your eyes and is absorbed by special sensory cells at the back of your eye called cones. These cells send an electrical message via nerves to your brain where they are organized, identified, and interpreted.
Perception is more than the brain receiving signals. Just like the picture is so much more than blobs of different colors. Your perception of the photo depends on what you know.
What do you see in the photo?
I see a parrot sitting on a tree stump. The bird and the tree stump are in focus, meaning they are a very clear image.
The background is out of focus, meaning the image is blurry. But, I assume that the background is a forest of trees because the bird lives in a forest.
I have a surprise for you. There is no parrot in the photo. The photo is of a woman.
Take a closer look at the photo. Can you see a woman whose body has been painted and positioned to look like a parrot?