Convert blend modes to an alpha channel?

SC
Posted By
Shaun_Collier
Oct 11, 2008
Views
340
Replies
4
Status
Closed
I found an image of the sun as a PNG file on Google Images. It had an entirely black background, but no alpha, so I decided to use the Screen blend mode and the black surrounding it was effectively removed, making it transparent. However, if I try to export to a PNG, this effect is not exported. I would like to import it into Flash, so it’s important that I find a workaround for this soon, or I will need to find a different image of the sun that already has alpha. (I don’t have time to create an alpha channel myself.)

Thanks, and if you need a better explanation, just let me know.
Related Tags
alpha blend channel conversion

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P
Phosphor
Oct 11, 2008
Can you post a link to the image you’re working with, or offer your copy of it for us to experiment with?

I’m thinking maybe one of the tools mentioned in the following thread might speed the process:

<http://www.adobeforums.com/webx/.3bc34571>
SC
Shaun_Collier
Oct 11, 2008
I just tried AlphaWorks, and it does the trick quite well! Thanks very much for the link. Problem solved.
C
Curvemeister
Oct 11, 2008

1) Alt-double click on the background layer to make it a normal layer.
2) ctrl click on the image in the Channel Palette to load the image as a selection.
3) use "Layer>Layer Mask>Hide Selection" to create a layer mask. (The image will have dark fringes at this point)
4) click on the image in the layers palette.
5) select the brush tool,
6) alt click on the edge of the sun
7) manually paint out any dark fringes.
8) save the result as your final png image.
SC
Shaun_Collier
Oct 11, 2008
Ahh, thank you very much. 🙂 Another great solution. Cheers!

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