Controlling blur with an alpha channel

D
Posted By
david
Dec 8, 2003
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545
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4
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Is it possible to control the amount of Gaussian blur using an alpha channel? I’d like to simulate a limited depth of field camera shot by increasing the blur at the further distances by setting a gradient alpha channel.

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Warren Sarle
Dec 8, 2003
"David C. Barber" wrote in message
Is it possible to control the amount of Gaussian blur using an alpha channel? I’d like to simulate a limited depth of field camera shot by increasing the blur at the further distances by setting a gradient alpha channel.

Photoshop CS is supposed to be able to do this.
In Photoshop 7 or earlier, load a selection from the alpha channel and apply Gaussian blur with a small radius repeatedly.
J
jenelisepasceci
Dec 8, 2003
"David C. Barber" wrote:

Is it possible to control the amount of Gaussian blur using an alpha channel? I’d like to simulate a limited depth of field camera shot by increasing the blur at the further distances by setting a gradient alpha channel.
IMO a layer mask is better suited for that purpose
Peter
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Warren Sarle
Dec 9, 2003
"Peter Wollenberg" wrote in message
"David C. Barber" wrote:

Is it possible to control the amount of Gaussian blur using an alpha channel? I’d like to simulate a limited depth of field camera shot by increasing the blur at the further distances by setting a gradient alpha channel.
IMO a layer mask is better suited for that purpose

A layer mask has no effect on the amount of blurring, only on the transparency of the blurred layer–not the same thing at all.
MP
Marc Pawliger
Dec 9, 2003
In article , David C. Barber
wrote:

Is it possible to control the amount of Gaussian blur using an alpha channel? I’d like to simulate a limited depth of field camera shot by increasing the blur at the further distances by setting a gradient alpha channel.

Photoshop CS’ Lens Blur can use a selection or alpha channel to control the amount of blurring. This is not a Gaussian Blur but closer to the blurring caused by an actual lens.

–marc

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