My experiments with HDR photography

by krishnamoorthyb

HDR stands for High Dynamic Range photography. The amazing thing for me is the fact that our human eye sees in HDR! No camera today can take a single picture that can capture the brightest and darkest areas of a scene with equal lighting. HDR is a classic case where the sum is much much better than the individual parts. HDR is a technique where we take multiple exposures(read photos) of the same scene with different exposures. Each shot is taken at a different exposure. In this manner each photograph would capture different parts of a scene with the correct amount of lighting. We then merge all the photographs using a HDR merging tool. There is a long way to go before I fully understand this art. I am halfway through the tutorial at

The following photographs were taken on a weekend drive to Puttaparthi. This small lake is about 60kms from Bangalore. These are taken with my Canon Powershot A630. I use CHDK ( for exposure bracketing as the camera does not have built in support for the same. The following are the settings on the CHDK menu and on the camera for these shots:


CHDK Menu->Extra Photo Operations->Bracketing in Continuous Mode

Tv Bracketing Value = 1 Ev, Bracketing Type = +/-


Shot Mode – Program (P )

Func/Set->Continuous Shooting Mode->Custom->MENU->Delay=1 Sec,Shots=5


IMG_6795 (Medium) Shutter speed = 1/800 sec
Note the color of the sky. The grass in front of the water body is dark. We have the sky but not the grass
IMG_6796 (Medium) Shutter speed = 1/400 sec
The grass is seen properly but the sky is now washed out.
IMG_6797 (Medium) Shutter speed = 1/1600 sec
The grass is dark again but note the setting sun! The sky is also a deeper blue now.
IMG_6798 (Medium) Shutter speed = 1/200 sec
The grass is very bright now. Nothing else is good in this photo.
IMG_6799 (Medium) Shutter speed = 1/2500 sec
Another shot to get just the sun!
IMG_6799_6_7_8_9_tonemapped (Medium) copy HDR Tonemapped.
This is how my mind remembers the scene!