Several Shades of Grey In Colour—Tracking the Light Daily Post.

Experiment in Post Processing.

On March 6, 2014, I was poised to make an image of Irish Rail 085 (in relatively fresh grey paint) using my Canon EOS 7D with 40mm lens. Before the train arrived, I made my requisite test exposure.

I always do this. A test exposure insures the camera is working and is set properly. It also allows me to fine tune my settings to optimize the amount of information captured.

In this case, I realized that to obtain the best exposure and retain sky detail, I would necessarily need to allow the ground and primary subject to be bit dark. However, since I can adjust this in post processing, I opted for the darker exposure.

I could have simply used the ‘levels’ or ‘curves’ feature in Photoshop to lighten the image. This is my normal quick adjustment. However, I thought I’d experiment. So I made series of localize contrast adjustments using the ‘Magnetic Lasso’ tool.

My aim was to even out the relative exposure of various areas, and specifically to reduce the extreme contrast between the sky and the train’s shadow areas, with an ultimate goal of presenting the scene in the final image as it appeared to me at the time of exposure.

I had no intention of exaggerating or distorting the effect of the overcast morning, but rather to correct for some of the inherent limitations of the camera system.

Below are a series of images that illustrate the steps of my contrast adjustment. I’ve intentionally grossly exaggerated adjusted areas as to make the process more obvious. My actual adjustments were relatively subtle. It is my feeling that if the process becomes obvious, the end result will seem artificial.