Tue, Nov 26, 9:31 AM CST

Renderosity Forums / Photoshop

All Forums

Welcome to the Photoshop Forum

Forum Moderators: Wolfenshire Forum Coordinators: Anim8dtoon

Photoshop F.A.Q (Last Updated: 2024 Nov 26 6:58 am)

Our mission is to provide an open community and unique environment where anyone interested in learning more about Adobe Photoshop can share their experience and knowledge, post their work for review and critique by their peers, and learn new techniques while developing the skills that allow each individual to realize their own unique artistic vision. We do not limit this forum to any style of work, and we strongly encourage people of all levels and interests to participate.

Are you up to the challenge??
Sharpen your Photoshop skill with this monthly challenge...

 

Checkout the Renderosity MarketPlace - Your source for digital art content!

 

Subject: Mask or Alpha channel

CobraEye opened this issue on Jan 25, 2006 ยท 10 posts
Back to Forum Print
CobraEye ( ) posted Wed, 25 January 2006 at 5:13 PM ยท edited Tue, 26 November 2024 at 6:59 AM

Is it possible to use a black and white image as a mask to another image the same size. If so, is an alpha channel or a mask the technique to use?

retrocity ( ) posted Wed, 25 January 2006 at 8:35 PM

not sure what you're trying achive... can you post an example of sorts??

they say a picture is worth a thousands words.. especially when it's an explanation ;)

:)
retrocity

aprilgem ( ) posted Wed, 25 January 2006 at 8:43 PM

Cobra, yes and yes.

CobraEye ( ) posted Wed, 25 January 2006 at 10:26 PM

file_321307.jpg

This is just an example. I hope this conveys the idea.

I want the blue layer to have a transparent gradient round hole so it shows the round picture underneath it. How to I use the black and white image to make that effect?

So far I get strange results.

aprilgem ( ) posted Thu, 26 January 2006 at 12:16 AM

Create a new image the same size as your blue and b/w images. Place your round picture in the center. Place the blue image as a new layer over your round picture. Create a new Alpha Channel. Copy the black and white image. Paste the black and white image into your new Alpha Channel. Ctrl-select your Alpha Channel so that you get the crawling ants. Go to your blue layer. Select Layer > Add Layer Mask > Hide Selection.

archdruid ( ) posted Thu, 26 January 2006 at 9:43 AM

Crawling ants?? LOVE it...... that's the best description yet. Lou.

"..... and that was when things got interestiing."

aprilgem ( ) posted Thu, 26 January 2006 at 11:48 AM

Yep. I wish I'd thought of it first, though. :)

CobraEye ( ) posted Thu, 26 January 2006 at 1:36 PM

That worked. So just to clarify: I am using the alpha channel as a mask by following these steps? Thanks

aprilgem ( ) posted Thu, 26 January 2006 at 1:56 PM

Actually, in this case, it's more like a holding area. I just had you use the alpha channel because it's easier to paste the black and white image to it and so you could more easily make a selection with the channel before creating the actual mask. The mask, on the other hand, is on the layer itself. It's kind of like an alpha channel that belongs only to that layer and that goes wherever the layer goes. :)

thundering1 ( ) posted Fri, 27 January 2006 at 3:22 PM

Crawling ants! That's funny - never thought of it that way! -Lew ;-)

Privacy Notice

This site uses cookies to deliver the best experience. Our own cookies make user accounts and other features possible. Third-party cookies are used to display relevant ads and to analyze how Renderosity is used. By using our site, you acknowledge that you have read and understood our Terms of Service, including our Cookie Policy and our Privacy Policy.