The ABC of Photography – Histogram

A graph that provides an instant guide to the contrast and exposure of a picture. It maps the distribution of tones, from the darkest on the left to the brightest on the right. The scale runs from 0 (solid black) to 255 (pure white), and the height of the graph at any point represents the relative number of pixels in the image with that brightness level. The overall shape of the histogram gives you an at-a-glance indication of the tonal range of the image and the presence of any clipping. You can use tools such as Levels to adjust the shape of the histogram and thereby improve the contrast and exposure of the image.

Sources:  Pixabay, NASA, Wikipedia, Susan Wingfield Lamar High School

The ABC of Photography – High-speed sync (HSS)

High-speed sync (HSS)

Flash feature that allows the use of shutter speeds with flash, faster than the usual sync speed. The flash pulses at high frequency to ensure even exposure, even though the shutter blinds are never fully open during the exposure. The facility is useful for freezing close-up action in daylight, and for allowing the widest apertures even in bright light.

Sources:  Pixabay, NASA, Wikipedia, Susan Wingfield Lamar High School


 

The ABC of Photography – Healing Brush tool

Healing Brush tool

A retouching tool that lays down copied pixels like the Clone Stamp tool, but in addition, it analyses nearby colour and tone and attempts to blend the cloned pixels in with the surrounding area. Sometimes it produces better results than the Clone Stamp, but not always because its blending effect will tend to blur detail. For seamless cloning, it’s often a good option to use both tools.

Sources:  Pixabay, NASA, Wikipedia, Susan Wingfield Lamar High School


 

The ABC of Photography – HDR (high dynamic range)

HDR (high dynamic range)

A digital imaging technique where a series of identical pictures of a scene are taken at different exposures and then combined into one image. This brings out detail in shadow and highlights areas that usually can’t be captured in a single exposure, and is particularly useful for high-contrast subjects, such as brightly-lit landscapes, interiors, and night scenes.

Sources:  Pixabay, NASA,Wikipedia, Susan Wingfield Lamar High School


 

The ABC of Photography – Hand tool

A tool for moving your image around when you’re zoomed in and can’t see all the images at once, by dragging on the image. Press the H key, or hold down the space bar, to switch to this tool quickly.

Sources:  Pixabay, NASA, Wikipedia, Susan Wingfield Lamar High School


 

The ABC of Photography – Haloes

Haloes

A term used to describe the glow that’s created around the edges of objects when they’ve been over-sharpened in Photoshop or other similar photo-editing software. They are even more prevalent in HDR images.

Sources:  Pixabay, NASA,Wikipedia, Susan Wingfield Lamar High School


 

The ABC of Photography – H

H

 

Haloes

A term used to describe the glow that’s created around the edges of objects when they’ve been over-sharpened in Photoshop or other similar photo-editing software. They are even more prevalent in HDR images.

Hand tool

A tool for moving your image around when you’re zoomed in and can’t see all the image at once, by dragging on the image. Press the H key, or hold down the space bar, to switch to this tool quickly.

 

HDR (high dynamic range)

A digital imaging technique where a series of identical pictures of a scene are taken at different exposures and then combined into one image. This brings out detail in shadow and highlights areas that usually can’t be captured in a single exposure, and is particularly useful for high-contrast subjects, such as brightly-lit landscapes, interiors, and night scenes.

Healing Brush tool

A retouching tool that lays down copied pixels like the Clone Stamp tool, but in addition, it analyses nearby colour and tone and attempts to blend the cloned pixels in with the surrounding area. Sometimes it produces better results than the Clone Stamp, but not always because its blending effect will tend to blur detail. For seamless cloning, it’s often a good option to use both tools.

High key

An image in which the bright, white tones dominate.

 

Highlights

The brightest (whitest) areas of an image.

High-speed sync (HSS)

Flash feature that allows the use of shutter speeds with flash, faster than the usual sync speed. The flash pulses at high frequency to ensure an even exposure, even though the shutter blinds are never fully open during the exposure. The facility is useful for freezing close-up action in daylight, and for allowing the widest apertures even in bright light.

 

Histogram

A graph that provides an instant guide to the contrast and exposure of a picture. It maps the distribution of tones, from the darkest on the left to the brightest on the right. The scale runs from 0 (solid black) to 255 (pure white), and the height of the graph at any point represents the relative number of pixels in the image with that brightness level. The overall shape of the histogram gives you an at-a-glance indication of the tonal range of the image and the presence of any clipping. You can use tools such as Levels to adjust the shape of the histogram and thereby improve the contrast and exposure of the image.

Hot shoe

An accessory shoe with an electrical contact, for mounting and connecting a flashgun.

Hue

Another term for colour. It tells you where a colour lies on the colour wheel without telling you how bright or dark it is.

Hyperfocal distance

The shortest distance at which a lens can be focused so that depth of field stretches to infinity for a given aperture and focal length. When focused at the hyperfocal length, depth of field will stretch from exactly half the hyperfocal distance to infinity.

Sources:  Pixabay, Wikipedia, Susan Wingfield Lamar High School