the histogram exposed (iii) – bimodal

This series of photographs and their associated histograms covers aesthetically pleasing bimodal histograms.

Histogram 1: A sky with texture

This image (of a building in Edinburgh) has a broad spectrum of intensity values. The histogram is bi-modal with two distinct humps. The right peak is associated with the overcast sky (and white van). The left shallow mound comprising both midtones and shadows makes up most of the remaining image content. There is a small flat region in between the two that makes up features like the lighter portions of the building. Note that pixels maps on the right of the histogram below show the associated pixels in black.

Histogram 2: Out on the lake

This photograph of the Kapellbrücke was taken in Lucerne, Switzerland. The histogram is bimodal, and asymmetric, and reflects the information in the image: the left hump (①) is associated with the lower portion of the image (shadows and midtones), and the right peak (② highlights) with the sky. There is relatively well contrasted image. The clouds have some good variation in colour, as opposed to begin pushed completely into the whites.

Fujifilm X10 (12MP): 7.1mm; f/9; 1/800

Histogram 3: Carved in stone

This is a photograph of the Lion of Lucerne, in Lucerne, Switzerland. It provides a classic asymmetric bimodal shaped histogram. The left mound, ①, contributes the images dark, shadowy regions, whereas the remaining, larger peak ②, bias towards highlights, defines most of the remaining image. It is well contrasted given that a shadow is cast on the sculpture as it is relief into the wall. The overlapping region between the two entities, ③, forms the transition regions from ① to ②, often visualized in the picture as regions of low “shadow”.

Fujifilm X10 (12MP): 21mm; f/3.2; 1/850


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