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Color to Alpha?

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koeru
Posts: 5
Filters: 1
Sorry, new here, so I don't know if this has been asked before, but is there a way to set an alpha so that a certain color becomes transparent?

Thanks.
Posted: July 28, 2010 10:24 am   Details E-Mail
Totte
Ãœbernerd

Posts: 1460
Filters: 107
You mean like this?
Just whipped one together for FF2 using a simple script. Might post it when polished.

color2alpha.ffxml
- I never expected the Spanish inquisition
Posted: July 28, 2010 11:53 am   Details E-Mail
koeru
Posts: 5
Filters: 1
Thanks! that's great. I don't really understand how the mapscript works, but I guess I should learn.

BTW-do you now how to take a selection and make the selection bigger or smaller? or like make a line of some thickness that follows the selection. Thanks!
Posted: July 28, 2010 1:40 pm   Details E-Mail
Totte
Ãœbernerd

Posts: 1460
Filters: 107
Quote
Thanks! that's great. I don't really understand how the mapscript works, but I guess I should learn.

Just look at the script code, very simple and straight forward.

Basically it picks a sample from Color and a Sample from source, compare rgb and checks if all three differensies are within then range.
- I never expected the Spanish inquisition
Posted: July 28, 2010 11:37 pm   Details E-Mail
Totte
Ãœbernerd

Posts: 1460
Filters: 107
Using a scale component would probably work on the selection, and outlining it would be using the same and some Threshold tricks. I dont have PS so testing selections in FF app is not really 100 easy.
- I never expected the Spanish inquisition
Posted: July 28, 2010 11:56 pm   Details E-Mail
Totte
Ãœbernerd

Posts: 1460
Filters: 107
I tried to submit it as a Snippet, but got an error while submitting, will try later (as suggested).
- I never expected the Spanish inquisition
Posted: July 29, 2010 12:08 am   Details E-Mail
koeru
Posts: 5
Filters: 1
Quote
Using a scale component would probably work on the selection, and outlining it would be using the same and some Threshold tricks. I dont have PS so testing selections in FF app is not really 100 easy.


But for intricate designs this would not work... like with lace or multiple small areas. The only other way I can think of is blurring, thresholding, and combining with the thresholded original to make it bigger or smaller... still have to test my idea though.

And for some reason the submit wizard refuses to let me sign in... weird.
Posted: July 29, 2010 9:54 pm   Details E-Mail
ThreeDee
Lost in Space

Posts: 1672
Filters: 112
Quote
koeru wrote:
do you now how to take a selection and make the selection bigger or smaller? or like make a line of some thickness that follows the selection. Thanks!


I would use minimum or maximum for changing selection size. For outlines I would blend it with the inverted original selection. Or you could do it the blur-and-threshold route.
Posted: August 5, 2010 1:59 am   Details E-Mail

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