Day – 2 Understanding Histograms for better photography

Being an engineer (who has struggled through graphs for most of his academics) I decided to learn more about histograms before I move ahead with my photography practice. This is essential for the exposure and tone (yes , yes there are a lot of photographic terms that I should know , I will write it down in a blog post ), So I Google it out and found and interesting video about the same. I started to experiment with my camera and the images and its histogram are shown in this blog post.

Basically, Histogram represents the distribution of data. Now in our case , the data is a pixel.So, histograms shows us the distribution of pixels on an axis of tone

The left side of the horizontal axis represents the black and dark areas, the middle represents medium grey and the right hand side represents light and pure white areas. The vertical axis represents the size of the area that is captured in each one of these zones. Thus, the histogram for a very dark image will have the majority of its data points on the left side and center of the graph. Conversely, the histogram for a very bright image with few dark areas and/or shadows will have most of its data points on the right side and center of the graph..

 

Read more about Image histograms at Wikipedia

 

This is an interesting video which will tell you more about the histograms.

 

Now I tried two random shots  (histograms attached)

This is the first shot that I took – underexposed

 

Learning to use histogram in photography
A random Shot

shot1_histogram

Improvement in next 3 shots (hope to improve in 2 shots only )

learning to use histogram in photography

corrected_shot_histogram

Day 1 – Learning about my new Camera – Nikon D3100

I have bought a new camera – Nikon D3100, which is a basic SLR camera for beginners. Here are some of it’s specifications.

 

Effective pixels
Effective pixels
14.2 million
Image sensor
Image sensor
23.1 x 15.4 mm CMOS sensor
Total pixels
14.8 million
Dust-reduction system
Image sensor cleaning, Airflow Control System, Image Dust Off reference data (optional Capture NX 2 software required)
Shutter
Type
Electronically controlled vertical-travel focal-plane shutter
Speed
1/4000 to 30 s in steps of 1/3 EV, Bulb
Flash sync speed
X=1/200 s; synchronizes with shutter at 1/200 s or slower
Focus
Autofocus
Nikon Multi-CAM 1000 autofocus sensor module with TTL phase detection, 11 focus points (including one
cross-type sensor), and AF-assist illuminator (range approx. 0.5 to 3m/1 ft. 8 in. to 9 ft. 10 in.)
Detection range
-1 to +19 EV (ISO 100, 20°C/68°F)
Lens servo
” Autofocus (AF): Single-servo AF (AF-S); continuous-servo AF (AF-C); auto AF-S/AF-C selection (AF-A); predictive focus tracking activated automatically according to subject status
” Manual focus (MF): Electronic rangefinder can be used
Focus point
Can be selected from 11 focus points
AF-area mode
Single-point AF, dynamic-area AF, auto-area AF, 3D-tracking (11 points)
Focus lock
Focus can be locked by pressing shutter-release button halfway (single-servo AF) or by pressing AE-L/AF-L button

For detailed specification – Please check out the NIKON official website

The SLR camera is a complex device to operate,so first thing first – Know about it. Unlike the best mirrorless camera set ups, you will need some custom configurations, it’s best to read the manual and take it one step at a time.

As I am using Nikon D3100 I google’d and found this amazing video by Froknowsphoto. I am embedding the same

Credits –Fro Knows Photo