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Thread started 25 Apr 2009 (Saturday) 03:33
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Digital Grad-ND effect for JPG images

 
oassayag
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Apr 25, 2009 03:33 |  #1

Hi,

Do you know of such plugin for photoshop that gives good results?


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KarlosDaJackal
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Apr 25, 2009 03:41 |  #2

I don't know photoshop well I use gimp, but it should be possible with any decent image editor to do the following.

1. Draw a gradient (usually with a gradient tool) from black to white (and top to bottom). 2. Apply the gradient as a mask with white being transparent, and black darkening.
3. Adjust the overall opacity of the mask to get the shot how you want it

That should get you to as close as you can get to what an ND grad would have done, but then you can also

4. edit the layer mask to suit your horizon as it may not be exactly a straight line in the image.


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oassayag
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Apr 25, 2009 04:37 |  #3

i prefer to use a plugin..... i will be doing this on multiple images


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HankScorpio
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Apr 25, 2009 05:18 |  #4

Tiffen DFX (external link) is one of the best and B+W software filters (external link) are good too but this is such an easy thing to do in PS with standard tools that few people have bothered writing plugins or actions to do it so your choices are limited and overpriced.


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rammy
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Apr 25, 2009 06:10 |  #5

It's only a couple of steps in PS. Otherwise get Lightroom 2.


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Skonk
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Apr 25, 2009 16:50 |  #6

You dont need a plugin for this, just do it once and record it as an action.

In photoshop....

Duplicate the layer and lower the exposure of the new layer(either using the Exposure option from the Image menu, or using the Levels tool).

Add a layer mask to the new layer and draw a black to white gradiant from the bottom of the image to the top, this will cause the under-exposed layer to show at the top of the image and gradually fade out as it goes down.

Then just play the action on the other images to repeat the process.


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Skonk
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Apr 25, 2009 17:36 |  #7

I was bored so I made a video showing what I was on about in my previous post.

20MB Quicktime:
<< LINK >> (external link)


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HankScorpio
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Apr 25, 2009 17:49 |  #8

Skonk wrote in post #7802978 (external link)
I was bored so I made a video showing what I was on about in my previous post.

20MB Quicktime:
<< LINK >> (external link)

It would be better to use an adjustment layer rather than a duplicate layer.

Also doesn't the gradient tool record the pixel coordinates in the action so it wouldn't then work properly on a different sized image?


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Skonk
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Apr 25, 2009 18:04 |  #9

Yeh the gradient tool is pixel coords, but if you are quickly trying to process shots from the same camera (or same MP cameras) then you would only need 2 actions, 1 for portrait and 1 for landscape.

Was just a quick example, obviously (as with most tasks) there are many ways to do the same thing in photoshop.


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islandboy
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Apr 27, 2009 13:37 |  #10

Nik has a grad ND filter in its color efex pro software which can be used as a plug-in. Pricy but there are a number of other good filters you might find useful.


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jimmyfingers
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Apr 28, 2009 06:41 as a reply to  @ islandboy's post |  #11

This guy appears to have a few ND Grad filters for Lightroom2
http://lightroom-blog.com/lrbgrad/ (external link)


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neilwood32
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Apr 28, 2009 06:43 |  #12

If you have CS4 then you can use ACR and use the grad filter there to reduce/increase exposure - even on jpegs (ACR can be used on all image types)


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Lowner
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Apr 28, 2009 10:18 |  #13

oassayag,

Surely every image will need to have the digital GND applied differently? Or do you always have the sky/land boundary in exactly the same position every time?


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oassayag
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Apr 28, 2009 11:24 |  #14

not every image has the same boundary , thats where the smooth transition comes in handy.
Thanks guys.


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Digital Grad-ND effect for JPG images
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