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From: Ian Piper on 23 Jan 2010 06:31
On 2010-01-23 10:44:42 +0000,
real-not-anti-spam-address(a)apple-juice.co.uk (D.M. Procida) said:

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

Oh, just as a follow-up to this, I should have mentioned one really
good tip for improving your cut-out images. Sometimes the result from
the Extract stage shows some "drop-out" - basically bare patches where
the background shows through. Or the edge definition is not all it
could be. Amazingly enough, you can radically improve the appearance of
the result by simply duplicating the layer. Just make sure the
appropriate layer is current and press cmd-J (Layer > New > Layer via
Copy on the menu). If you do this several times the areas of drop-out
fill in. When it looks OK you can flatten the layers into one layer
using shift-cmd-E (Layer > Merge Visible).


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 24 Jan 2010 04:38
On 2010-01-23 10:44:42 +0000, D.M. Procida said:

> 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.

I had a similar experience with the instructions for Decompose but when
it worked it was brilliant. Generally the result was a 100% transparent
rectangle.

As an aside Photoshop CS4 no longer includes the extract tool by
default and it needs to be downloaded or installed from the 'goodies'
folder.
--
Cheers,

Steve

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

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