gradual depth of field

AA
Posted By
Andy Aldridge
Jun 1, 2004
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337
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5
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Could you tell me how to get a gradual Depth of Field effect instead of making the area all the same blur?

—
Andy Aldridge

http://www.btinternet.com/~andrew.aldridge1/
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JK
JP Kabala
Jun 1, 2004
Duplicate the layer twice
Extract all objects to remain in sharp focus, put these on the top layer Take another duplicate, and radial blur it, put it in the middle Leave the third copy alone

Now mask the middle copy with a gradient mask, and reduce the opacity of the layer group.

"Andy Aldridge" wrote in message
Could you tell me how to get a gradual Depth of Field effect instead of making the area all the same blur?

—
Andy Aldridge

http://www.btinternet.com/~andrew.aldridge1/
All Mail Checked with Nortons Anti Virus 2003

************************************************************ ********** This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the system manager.

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C
customersupport
Jun 1, 2004
Andy Aldridge wrote:

Could you tell me how to get a gradual Depth of Field effect instead of making the area all the same blur?
open your image, select quick mask mode, use linear gradient on that image, go back to standard mode. You will see marching ants selection on the area where your white portion of your black & white gradient was go to filter, select blur, and use Gaussian blur. That will do it. I use that technique a lot.

L. McKenzie
Solo Computer Services
T
toby
Jun 2, 2004
"L. McKenzie" …
Andy Aldridge wrote:

Could you tell me how to get a gradual Depth of Field effect instead of making the area all the same blur?
open your image, select quick mask mode, use linear gradient on that image, go back to standard mode. You will see marching ants selection on the area where your white portion of your black & white gradient was go to filter, select blur, and use Gaussian blur. That will do it. I use that technique a lot.

That is not the same as a gradual defocus (a difference discussed many times in the past). All it does is a mix a perfectly sharp image and an image with a constant amount of blur. A diagram at
http://www.stereopsis.com/kpt/kptblur.html#kr shows the difference; compare images 3 and 4 under the heading Variable Radius.

To approximate "realistic" DOF requires a variable blur radius. Before Photoshop CS, there was no simple way to do this with built-in tools, but CS has introduced the Lens Blur filter that can do it.

Toby

L. McKenzie
Solo Computer Services
FA
Fred Athearn
Jun 3, 2004
On Tue, 01 Jun 2004 15:06:14 GMT, "L. McKenzie" wrote:

open your image, select quick mask mode, use linear gradient on that image, go back to standard mode.

Another way to do it is to select with the lasso the areas you want less, or more, in or out of focus, hit q and then do a gausian blur on the quick mask previewing the amount of "feathering" you are adding in this way until it until it looks right. Then hit q to get back a regular selection, invert if necessary, and apply gausian blur, or unshap mask, to the image in a feathered way that you have previewed.

Use several layers if needed.
AA
Andy Aldridge
Jun 3, 2004
Thanks for all your input. Im trying to get my head around the best way:) Andy

"Fred Athearn" wrote in message
On Tue, 01 Jun 2004 15:06:14 GMT, "L. McKenzie" wrote:

open your image, select quick mask mode, use linear gradient on that image, go back to standard mode.

Another way to do it is to select with the lasso the areas you want less, or more, in or out of focus, hit q and then do a gausian blur on the quick mask previewing the amount of "feathering" you are adding in this way until it until it looks right. Then hit q to get back a regular selection, invert if necessary, and apply gausian blur, or unshap mask, to the image in a feathered way that you have previewed.
Use several layers if needed.

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