Hello: extract an image from a white background

MR
Posted By
Mike Russell
Feb 22, 2008
Views
650
Replies
6
Status
Closed
"Freddie Maranzano" wrote in message
Hello,
I have need to extract an image froma a white background for place this image on a black background on a flash file.
The problem is that there is a white halo that is ugly to see. I heve tried to select the white colors, on Safe for web command, to render transparent but the result is not fine.
There’s a solution?
I hope of to have been clear and sorry for my english… 🙂

Hi Freddie,

There are quite a few solutions, as well as ways of extracting your original image. If you started out by using the magic wand, as many people do, that could be the source of the problem.

Photoshop’s Filter>Extract… command can do a beautiful job of removing the original matte color, so you may want to check out a tutorial on the correct use of that command. If this is not relevant to your problem, or otherwise does not improve things, there are at least two commands may help with this. First get your extracted image on a separate layer. Then use one of these two procedures

1) Layer>Matting>Remove Black Matte – will quickly remove the black for most cases. It will fail if the layer has large feathered edges.

2) If that doesn’t work, use Select>Load Selection… to load the selection from the transparency information of the extracted layer. Then use Selection>Refine Edge… and click on Preview. Select the icon for a white background, and use the various sliders to adjust your selection. Once you have it looking good, click OK, invert the selection and press the delete key to clean up the layer. This method has the problem that you are deleting part of the edge to get rid of the black fringe.

If none of the above methods work, there are any number of techniques that might work for your particular image. I suggest that you post a sample of the image for people to look at and make more specific suggestions. If necessary, join Flickr.com or a similar site, post your image, and provide a link to it here.

Mike Russell – www.curvemeister.com

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F
freddie
Feb 22, 2008
Hello,
I have need to extract an image froma a white background for place this image on a black background on a flash file.
The problem is that there is a white halo that is ugly to see. I heve tried to select the white colors, on Safe for web command, to render transparent but the result is not fine.
There’s a solution?
I hope of to have been clear and sorry for my english… 🙂

Freddie
GH
Gernot Hoffmann
Feb 22, 2008
Freddie Maranzano schrieb:
Hello,
I have need to extract an image froma a white background for place this image on a black background on a flash file.
The problem is that there is a white halo that is ugly to see. I heve tried to select the white colors, on Safe for web command, to render transparent but the result is not fine.
There’s a solution?
I hope of to have been clear and sorry for my english… 🙂
Freddie

Freddie,

there are a couple of methods. One of them:
1. Select the object
2. Select > Modify > Contract (this shrinks the size by 1..2 pixels)
3. Put the selection onto the black background
4. Apply a little Gaussian Blur to the boundary between
the object and the black background, using a coarse
selection of this boundary.
You’ll never get pleasing results if you put the object
with transparent background on a HTML-color area.

Best regards –Gernot Hoffmann
P
pico
Feb 22, 2008
"Freddie Maranzano" wrote in message
Hello,
I have need to extract an image froma a white background for place this image on a black background on a flash file.
The problem is that there is a white halo that is ugly to see. I heve tried to select the white colors, on Safe for web command, to render transparent but the result is not fine.
There’s a solution?

Change the fringe pixels to black.
F
freddie
Feb 23, 2008
On Fri, 22 Feb 2008 16:51:44 -0600, "pico" <pico.pico.pico> wrote:

"Freddie Maranzano" wrote in message
Hello,
I have need to extract an image froma a white background for place this image on a black background on a flash file.
The problem is that there is a white halo that is ugly to see. I heve tried to select the white colors, on Safe for web command, to render transparent but the result is not fine.
There’s a solution?

Change the fringe pixels to black.

Thanks to all. Your help is very appreciated.
I’ll try all of your suggestion and then I’ll noticed you. Thanks again

Freddie
R
ronviers
Feb 23, 2008
On Feb 22, 9:32 am, (Freddie Maranzano) wrote:
Hello,
I have need to extract an image froma a white background for place this image on a black background on a flash file.
The problem is that there is a white halo that is ugly to see. I heve tried to select the white colors, on Safe for web command, to render transparent but the result is not fine.
There’s a solution?
I hope of to have been clear and sorry for my english… 🙂
Freddie

Hi Freddie,
As others have mentioned there are a lot of ways to approach this and each image is different and will probably need a different approach. So what I like to do is look carefully at the halo and ask some basic questions. Things like. Is it neutral? Is it stratified? Are the areas where it varies, for example in size, easy to delineate? Is the falloff consistent? What I am looking for are the attributes of the halo that make it distinctly visible. Those are the things that can be used to isolate it and remove it.
Blur, high pass and threshold are things you might want to read up on. They can be used together to isolated edges.
Good luck,
Ron
F
Fred
Feb 28, 2008
Hello,
I have need to extract an image froma a white background for place this image on a black background on a flash file.
The problem is that there is a white halo that is ugly to see. I heve tried to select the white colors, on Safe for web command, to render transparent but the result is not fine.
There’s a solution?
I hope of to have been clear and sorry for my english… 🙂
Freddie

Take a look here, Freddie (scroll to the bottom of the page, to Advanced masking)
http://www.russellbrown.com/tips_tech.html

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