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Background blur in an image is related directly to lens compression, subject-to-camera distance and aperture.
One of the factors necessary to achieve a pleasing background blur is a large image sensor.
Here's an example: Background blur depends on your depth of field.
For instance, Soften Background shows an example photo with a background blur and tells how the effect is achieved (a shallow depth of field).
PROFESSOR: And the background blur, basically at the high frequencies that the eye can't follow and then, kind of, superimposed on that again, we can see the frequencies that are aliased down.
For those a bit more adventurous, there is the guided edit menu, which coaches you through edits step-by-step, from simple cropping to more advanced techniques, like color correction, or creating a depth-of-field background blur.
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This technique uses the blurred background to highlight the motion of the subject, whereas background blurred solely through a shallow depth of field is used to make the subject stand out from its surroundings.
It was then, by using Photoshop layers, that he had introduced the background blurring and the bluish effect on the horizon.
The aim of wearables should be to operate silently but powerfully in the background, blurring the interface between ourselves and the device.
He is played here by the enchanting Indian actor Sabu, whose own background blurred for western audiences with the exoticism of the role.
In one shot, a boy holding a baseball is shown with the ball sharply in focus and the boy and background blurred, but then the focus changes to include both the boy and the ball.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com