Graduated lens blur help needed

2004-02-05 21:09:27

Hi
Can anyone point me in the direction of step by step instructions on getting a graduated lens blur.
Thanks
Alastair

2004-02-05 21:36:24

"Al" wrote:

Hi
Can anyone point me in the direction of step by step instructions on getting a graduated lens blur.
Thanks
Alastair

Are you referring to an effect where the actual amount of blur occurs as a gradient, such as simulating depth-of-field? As of Version 7 there isn't really a way to achieve this.

You can do a poor simulation of a gradient blur by duplicating your sharp layer, blurring one of the two layers and applying a gradient layer mask to the upper layer. This "reveals" the blur (or the sharp version, depending upon which layer is on top and masked) gradually across the image. It doesn't change the actual size of the blur, just crudely imitates the effect by revealing it gradually.

Others may know a better way.
-------------------------------
Tom

Unsolicited advertisements cheerfully ignored.

@Al

2004-02-05 21:48:20

Thanks Tom
I should have said it was the lens blur feature in CS. I understand there is a method where you create an alpha channel, graduate it and apply lens blur to get a graduation from "in focus" to blur. I just don't seem able to get it to work.
regards
Alastair
"Tom Thomas" wrote in message

"Al" wrote:

Hi
Can anyone point me in the direction of step by step instructions on

getting

a graduated lens blur.
Thanks
Alastair

Are you referring to an effect where the actual amount of blur occurs as a gradient, such as simulating depth-of-field? As of Version 7 there isn't really a way to achieve this.

You can do a poor simulation of a gradient blur by duplicating your sharp layer, blurring one of the two layers and applying a gradient layer mask to the upper layer. This "reveals" the blur (or the sharp version, depending upon which layer is on top and masked) gradually across the image. It doesn't change the actual size of the blur, just crudely imitates the effect by revealing it gradually.

Others may know a better way.
-------------------------------
Tom

Unsolicited advertisements cheerfully ignored.

@Doug Chaplin

2004-02-05 22:35:55

"Al" wrote in message

Thanks Tom
I should have said it was the lens blur feature in CS. I understand there

a method where you create an alpha channel, graduate it and apply lens

blur

to get a graduation from "in focus" to blur. I just don't seem able to get it to work.
regards
Alastair

Create the alpha channel, as you want it, then call up the Lens Blur filter dialogue, and the drop down menu for Depth Map will have your alpha channel listed, so you can apply it as you need.
--
Doug

@Al

2004-02-06 08:44:21

Thanks Doug
Don't know where I am going wrong but all I am getting is a graduated darkening of the image without any blur - any Ideas?
Regards
Alastair
"Doug Chaplin" wrote in message

"Al" wrote in message

Thanks Tom
I should have said it was the lens blur feature in CS. I understand

there

is

a method where you create an alpha channel, graduate it and apply lens
blur

to get a graduation from "in focus" to blur. I just don't seem able to

get

it to work.
regards
Alastair

Create the alpha channel, as you want it, then call up the Lens Blur

filter

dialogue, and the drop down menu for Depth Map will have your alpha

channel

listed, so you can apply it as you need.
--
Doug

@Doug Chaplin

2004-02-06 18:22:09

"Al" wrote in message

Thanks Doug
Don't know where I am going wrong but all I am getting is a graduated darkening of the image without any blur - any Ideas?
Regards

Sorry, no idea - have you tried deleting your preferences file and recreating it? It seems to fix a remarkable number of problems in PS.

--
Doug

@Flycaster

2004-02-06 19:00:48

"Doug Chaplin" wrote in message

"Al" wrote in message

Thanks Doug
Don't know where I am going wrong but all I am getting is a graduated darkening of the image without any blur - any Ideas?
Regards
Sorry, no idea - have you tried deleting your preferences file and recreating it? It seems to fix a remarkable number of problems in PS.

It sounds like he applied the gradient to the layer rather than to the mask.

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@Al

2004-02-06 19:47:35

I applied the gradient to the alpha channel I created to which I then applied the lens blur.
"Flycaster" wrote in message

"Doug Chaplin" wrote in message

"Al" wrote in message

Thanks Doug
Don't know where I am going wrong but all I am getting is a graduated darkening of the image without any blur - any Ideas?
Regards
Sorry, no idea - have you tried deleting your preferences file and recreating it? It seems to fix a remarkable number of problems in PS.

It sounds like he applied the gradient to the layer rather than to the

mask.

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@Flycaster

2004-02-06 22:52:51

"Al" wrote in message

I applied the gradient to the alpha channel I created to which I then applied the lens blur.

OK, let's do a quick test: Open any simple image with a flattened background, create your mask-alpha channel] (quick mask will do), save it, leave quick mask, open lens blur, select the saved mask-alpha channel, apply the lens blur and look at the preview window.

If it works like it should, go back and debug your previous workflow. If it doesn't, take Doug's advice and trash the prefs file and try again.

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@Al

2004-02-07 17:29:04

Thanks for all your help
I'm not there yet, but will keep trying
Alastair
"Flycaster" wrote in message

"Al" wrote in message

I applied the gradient to the alpha channel I created to which I then applied the lens blur.

OK, let's do a quick test: Open any simple image with a flattened background, create your mask-alpha channel] (quick mask will do), save it, leave quick mask, open lens blur, select the saved mask-alpha channel,

apply

the lens blur and look at the preview window.

If it works like it should, go back and debug your previous workflow. If

doesn't, take Doug's advice and trash the prefs file and try again.

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