Digital Photography Essentials by Tom Ang

Author:Tom Ang [Ang, Tom]
Language: eng
Format: epub, pdf
Published: 0101-01-01T00:00:00+00:00

Noisy additions

Smooth and detailed images aren’t always the best way to reveal

a scene (inset right). Imitating the grain of the classic developer

Agfa Rodinal (detail, inset far right) gives a better sense of the

timelessness of this view of young monks reading.

improve the selectivity of noise reduction to reduce loss

DID YOU KNOW?

of detail. At the same time, these applications may apply

sharpening and other adjustments, all of which you can

Image averaging reduces noise in low-light exposures

of static subjects. To do this, make two or more correctly

control. Ultimately you need to strike a balance between

exposed shots using a tripod. Open the images and copy

tolerable loss of detail, and reduction in noise.

them all into a new image, each as a layer. Change the

opacity of each layer according to the number of layers

Increasing noise

below it. Set the bottom layer to 100 percent; if there’s

Despite being digital photography’s main enemy, noise can

one layer below, set this to 50 percent; for two layers, 33

also be useful. For example, it’s essential when you want to

percent; for three, 25 percent; and for four, 20 percent.

recreate the texture and tone of film-based prints; for the

Then, flatten the image. Some cameras carry out this

most realistic results, software from DxO Optics and Alien

process automatically, although making the multiple

Skin can simulate film grain based on noise profiles

exposures will greatly increase the capture time.

obtained from actual film.

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