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From: D.M. Procida on 1 Jan 2010 19:29
I've been sent a scanned image, of a piece made with felt and thread.

The background behind the piece should be white, but isn't; in one
corner it has a slight bluish cast, in another it's slightly pink (I
think it's reflected light from the material).

I'd like to remove all this unwanted background, and do the minimum
damage to the edges of the piece when I do. For example, I want to
retain as far as possible the little fibres of felt at the edges.

None of the processes I've tried so far have been very satisfactory.
What would the image manipulation experts here do?

Daniele
From: Ian McCall on 2 Jan 2010 03:53
On 2010-01-02 00:29:42 +0000,
real-not-anti-spam-address(a)apple-juice.co.uk (D.M. Procida) said:

> None of the processes I've tried so far have been very satisfactory.
> What would the image manipulation experts here do?

Does this help at all? May have to do it in two stages, one for the
blue and one for the pink.
<http://www.pixelmator.com/learn/2009/04/quickly-remove-unwanted-background/>



Cheers,
Ian

From: Ian Piper on 2 Jan 2010 04:56
On 2010-01-02 00:29:42 +0000,
real-not-anti-spam-address(a)apple-juice.co.uk (D.M. Procida) said:

> I've been sent a scanned image, of a piece made with felt and thread.
>
> The background behind the piece should be white, but isn't; in one
> corner it has a slight bluish cast, in another it's slightly pink (I
> think it's reflected light from the material).
>
> I'd like to remove all this unwanted background, and do the minimum
> damage to the edges of the piece when I do. For example, I want to
> retain as far as possible the little fibres of felt at the edges.
>
> None of the processes I've tried so far have been very satisfactory.
> What would the image manipulation experts here do?
>
> Daniele

Two suggestions.

First, the way to do this in Photoshop is to use the Extract tool
(Filter->Extract in Photoshop CS). In the resulting window you use a
variable-sized felt-tip pen tool to mark out the boundary between
foreground and background - it works surprisingly well with hair and
similar edges.

Second, there is a program written to do just this - Decompose
(http://www.metakine.com/products/decompose/). I find it can work in
some cases where the Photoshop Extract tool doesn't. There is a free
trial.


Ian.
--
Ian Piper
Author of "Learn Xcode Tools for Mac OS X and iPhone Development",
Apress, December 2009
Learn more here: http://learnxcodebook.com/�
--�

From: Steve Hodgson on 2 Jan 2010 06:11
On 2010-01-02 09:56:52 +0000, Ian Piper said:

> Second, there is a program written to do just this - Decompose
> (http://www.metakine.com/products/decompose/). I find it can work in
> some cases where the Photoshop Extract tool doesn't. There is a free
> trial.

That looks very good and I may try this too at some point.
--
Cheers,

Steve

The reply-to email address is a spam trap.
Email steve 'at' shodgson 'dot' org 'dot' uk

From: D.M. Procida on 23 Jan 2010 05:44
Ian Piper <ianpiper(a)mac.com> wrote:

> > I've been sent a scanned image, of a piece made with felt and thread.
> >
> > The background behind the piece should be white, but isn't; in one
> > corner it has a slight bluish cast, in another it's slightly pink (I
> > think it's reflected light from the material).
> >
> > I'd like to remove all this unwanted background, and do the minimum
> > damage to the edges of the piece when I do. For example, I want to
> > retain as far as possible the little fibres of felt at the edges.

> First, the way to do this in Photoshop is to use the Extract tool
> (Filter->Extract in Photoshop CS). In the resulting window you use a
> variable-sized felt-tip pen tool to mark out the boundary between
> foreground and background - it works surprisingly well with hair and
> similar edges.
>
> Second, there is a program written to do just this - Decompose
> (http://www.metakine.com/products/decompose/). I find it can work in
> some cases where the Photoshop Extract tool doesn't. There is a free
> trial.

Thanks Ian.

I couldn't make head nor tail of the Decompose instructions, but
Photoshop did a super job.

Daniele
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