>>On 02/17/2011 03:00 AM, Suntot wrote:
>>> Well, I am new at this. Not even sure if what I am attempting is
>>> possible. I am trying to change a specific color in an image. If I
>>> use 'color selection' the edges don't change color. So I am trying
>>> to use color to alpha... But, when I select by color, it seems to
>>> select all similar color in the area, thus when I add a new layer
>>> it does the change the color I wanted to change, but it also
>>> changes the rest of the image with a similar color tone. What can I
>>> do to precisely select a specific color or portion of an image with
>>> color to alpha?
>>>
>
>>Color-to-alpha only applies to the selection, so you can restrict its
>>effects by doing a selection first. For instance to remove a
>> background,
>>use the wand to get a rough selection of the background, grow the
>>selection by  a couple of pixels so that it includes the edges of the
>>foreground, and perform color-to-alpha.
>
>
> I tried doing a selection but since both colors are similar it selects
> all. Changed selection thresholds and it still doesn't work. Here is
> what I am trying to change:
> http://www.weddingclipart.com/wca/edittemplate.do?template=218069
>
> I am trying to change the colors of the scrolls on the wedding
> invitation. The dark blue into a red, the lighter into a black. Yet I
> can't seem to get it to work flawlessly. Please help. thanks




Use Colors->Threshold. You can then make an image like 
http://members.pcug.org.au/~rcook/images/threshold.png

Then do what you want with it. Just note that the scrolls are mirrors
and reflection of one basic element, so you should be able to
reconstruct easily



-- 
Owen

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