Re: Filtering out a specific color from an image?

I have gotten gotten this to work. Basically, I generated a png that had
the areas of the image (a jpeg in this case) that contain the color to
change as black pixels and all other areas as transparent pixels. Then I
did an feComposite using the xor operator on the two images. Success!
although only useful in very limited circumstances, this was a fun thing to
figure out.

On Wed, Oct 10, 2012 at 12:09 PM, Marty Sullivan <[email protected]> wrote:

> Or perhaps I could do this with a <mask> instead?
>
>
> On Wed, Oct 10, 2012 at 9:44 AM, dark3251 <[email protected]> wrote:
>
>> **
>>
>>
>> I am trying to figure out if there would be a way to apply a filter to an
>> image that would filter a specific color and change it. For example, let's
>> say I wanted to apply a filter that would take any pure blue pixels and
>> change its alpha to 0 making it transparent.
>>
>> I've been looking at the feColorMatrix and/or feComponentTransfer but I'm
>> not sure if this could be done with those. Another idea that crossed my
>> mind was feComposite by loading in a pure transparent image and then taking
>> the image to be filtered and somehow making the composite result change
>> just the color I'm looking for.
>>
>> Anyone have any ideas here? It seems like I should be capable of doing
>> this somehow.
>>
>>  
>>
>
>


[Non-text portions of this message have been removed]



------------------------------------

-----
To unsubscribe send a message to: [email protected]
-or-
visit http://groups.yahoo.com/group/svg-developers and click "edit my membership"
----Yahoo! Groups Links

<*> To visit your group on the web, go to:
    http://groups.yahoo.com/group/svg-developers/

<*> Your email settings:
    Individual Email | Traditional

<*> To change settings online go to:
    http://groups.yahoo.com/group/svg-developers/join
    (Yahoo! ID required)

<*> To change settings via email:
    [email protected] 
    [email protected]

<*> To unsubscribe from this group, send an email to:
    [email protected]

<*> Your use of Yahoo! Groups is subject to:
    http://docs.yahoo.com/info/terms/