world around us-color

                                                        

                                                                   Colour perception

Working in camera domain as engineer is the everlasting experience and change in my life. It has been only few weeks studying about camera I realized that we human being perceive world around us almost in same manner as Camera.

 I have been student of science, so this article is going to be little science oriented.

How do we see color? If we think little logical and scientific we find that a camera cannot capture photo without light at all, so the eyes. How does a lifeless object can recognize colours. Let us find it out. As shown in below picture, light rays come from an object to camera from its each and every point and camera stores image information in memory card in form of pixel (the smallest part of an image).

How do our eyes know/recognize that the chest part of dog is white and leg is yellow?  It just knows or eyes do not know at all and just passes all information to brain through synaptic network and our brain decides it.

As we know that light travels in form of photons i.e. energy packets and photons do not have colours. The main part of camera is sensor on which light falls. All colours have their own frequency. When a bunch of different frequencies fall on the camera sensor they cause current flow on the sensor (CCD). Amount of current flows on each part of CCD sensor of camera depends on frequency. Camera stores these in form of voltage and charge and uses the same information to develop the picture.

But still camera does not know the colours. It recognizes all the outside data only in form of current, voltage and charge. Similar way our eyes do not recognize any colours. Light amount that is falling on our eyes are converted into biological signals of different strength and passed to brain.

As Shown in above figure, retina is responsible to convert light into biological signals and then it goes onto brain through synaptic network. Brain interprets the signal and decides the colours. So when frequency changes colour also changes.

Therefore, in nature there is no colour at all except number of waves with varying frequencies. Colours are constructing of our mind and it is not the true nature of any Object. If evolution of mind is different in other species they might be seeing these all frequencies as different colour than human being. So, is there any way to find out reality?