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Adding drop shadows to images with backgrounds

Apr 26, 2012, 01:43
Post: #1
Sad Adding drop shadows to images with backgrounds
I am at my wit's end! I have searched the internet for hours on how to add drop shadows to an image that already has a background (such as a forest, etc.). Can someone please help me???

Thank you!
Treycee
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Apr 26, 2012, 07:30
Post: #2
RE: Adding drop shadows to images with backgrounds
The mere concept of "drop shadow" implies that you have something standing in front of a background, which, in image editors such as Gimp (or PS) implies that this object is on its own layer. The produced shadow is also too regular in shape to be used on natural objects (you get something like this).

So you have to paint it:
- add a transparent layer
- set it to "Multiply" mode
- paint with light gray where you want shadows
- you can adjust the shadow intensity by playing with the opacity layer

If you are adding a shadow to a fairly well delimited object, you can obtain a rough shadow shape like this:
- Create a path that delimits the object
- Use the perspective tool (in "Path" transform mode) to transform that path into the shadow shape
- Paint using the path as a template guide.

With all due warnings about unnatural looking shadows:
- Create a selection around object (using a path, or the scissors...)
- Save this selection to a channel
- Use the perspective tool (in "Selection" transform mode) to transform that selection into the shadow shape
- From the shadow selection, subtract the saved selection (ot avoid th eobject casting a shadow on itself)
- Bucket-fill selection with light gray on layer in multiply mode.

Now answering your questions on
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Apr 26, 2012, 12:24
Post: #3
RE: Adding drop shadows to images with backgrounds
Wow, this sounds complicated, I thought it would be easier. The photo I took does not have shadows now and it is of a person standing against a wall with nothing else around, so I want to add a drop shadow or a cast shadow to appear more normal. Do I need to cut the image out and paste in to a new layer and then do the drop shadow function? I need a tutorial if there is one please.

Thank you!
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Apr 26, 2012, 13:11
Post: #4
RE: Adding drop shadows to images with backgrounds
- outline subject with scissors
- Edit/copy + Edit/paste as new layer (so the subject is now *also* in its own transparent layer)
- on that new layer: Layer/Transparency/Alpha to selection
- insert new transparent layer between the two, set to multiply
- bucket fill selection this layer with light gray
- drag this layer to the side ot make shadow appear
- adjust transparency level
- apply gaussian blur (Filter/Blur/Gaussian blur) to shadow layer

You can also use a drop-shadow script once you have cut the subject to its own layer.

Btw, unless the wall is completely flat, you'll have to add shadows to the wall relief too.

Now answering your questions on
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Apr 26, 2012, 15:21
Post: #5
RE: Adding drop shadows to images with backgrounds
Thank you, I will try that!!
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Apr 27, 2012, 15:52
Post: #6
RE: Adding drop shadows to images with backgrounds
Nope, didn't work. I KNOW there is a way to get this to work, please help!!
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Apr 27, 2012, 16:31
Post: #7
RE: Adding drop shadows to images with backgrounds
(Apr 27, 2012 15:52)Treycee Wrote:  Nope, didn't work. I KNOW there is a way to get this to work, please help!!
Did you try?

Before:

[attachment=1115]

After:

[attachment=1116]

Complete XCF also attached for your perusal:

Now answering your questions on
https://Gimp-Forum.net
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Apr 27, 2012, 20:18
Post: #8
RE: Adding drop shadows to images with backgrounds
Actually, I got it to work. I may have gone thru some extra steps, but it worked. Thanks!!

(Apr 27, 2012 16:31)ofnuts Wrote:  
(Apr 27, 2012 15:52)Treycee Wrote:  Nope, didn't work. I KNOW there is a way to get this to work, please help!!
Did you try?

Before:



After:



Complete XCF also attached for your perusal:
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