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Simulating diffusion filters with PhotoShop
Old 10-16-2004, 04:50 AM   #1 (permalink)
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I am still relatively inexperienced with PhotoShop. Is there a way to simulate shooting through a diffusion filter? [img]/ubbthreads/images/graemlins/confused.gif[/img]

When shooting with film I usually prefer to wait until the darkroom to use a diffusion filter (A Cokin 083 works perfectly under the enlarging lens). That way I have a sharp negative, which leaves me more options.

How do we simulate this effect with PS? There has to be more to it than Blur or Smart Blur.

SM
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One way I do It
Old 10-16-2004, 07:08 AM   #2 (permalink)
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There are probably many different ways to do this in Photoshop but, I have a favorite way that I like to do it.

Bring the image into Photoshop.

Then duplicate the layer.

Go to filter, blur, Gaussian blur.

I normally don't set the blur any higher than 2 but it's all up to how you want the image to look.

Then on the right hand side of the screen where it says layers, click on the little arrow and you should see a whole bunch of effects listed.

Click on lighten. You will then get the soften effect.

You can leave the effect as is or you can pull the effect down some with the fill bar which is on the same panel.

I duplicated the layers because if you want certain areas still sharp and totally in focus, you can erase that part back in.

PS: This effect works very well on water to give it the cotton candy affect as well.

I hope this was understood and that I could help some.........
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Re: One way I do It
Old 10-16-2004, 09:56 AM   #3 (permalink)
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That works quite well, thanks! [img]/ubbthreads/images/graemlins/smile.gif[/img]
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Re: Simulating diffusion filters with PhotoShop
Old 10-16-2004, 10:08 AM   #4 (permalink)
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Or you could try the easy way, just go to filters/distort/diffuse glow and set the glow amount to zero
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[censored] simulation
Old 10-16-2004, 03:56 PM   #5 (permalink)
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Ran across this one in a Photoshop Mag and it looks great:
To simulate the highlight blur used in early [censored] glamour shots do a cmd-option-shift-tilde (sorry this is for a Mac I don't know what the keyboard shortcuts are for the PC) this will select the high lights of the picture then do a cmd-j to copy to a separate layer. Now do a gaussian blur and watch the pic to determine the amount. Lots to experiment with here but the results can be fairly impressive.
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Re: One way I do It
Old 10-16-2004, 06:11 PM   #6 (permalink)
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The method Alica Marie uses is basically the same method I use, except for one minor difference -- I make a duplicate layer, apply a lot of Gaussian blur (like around 25 04 35 pixels), keep the blend options at normal, then lower the Opacity or Fill sliders to around 25% or until it looks good. Then you can use the eraser to remove areas you don't want the softening.

Sometimes, for a more glowing effect, I make another duplicate copy of my original layer, set my background color to white, set my foreground color to black, then select FILTERS-DISTORT-DIFFUSE GLOW. Adjust the sliders to the correct amout or slightly more than the correct amount. Now use the FILL or OPACITY sliders to reduce the opacity to a pleasing about (about 25% to 35% depending on the look you want)

Both the above techniques were used to get a soft, slightly glowing effect on the picture of Alexa below.
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Re: One way I do It
Old 10-16-2004, 11:21 PM   #7 (permalink)
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And Alice will beat me for this.... but check out DCE Tools they have an extended evaluation version for windows only.... duplicate the layer....run the portrait skin cleaning tool at full strength on the layer.....use a mask and paint over the areas you want sharp....then drop the opacity layer down till you reach the glow you want....this works well for removing small blemishes from the skin as well.


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