Alpha overlay in Illustrator

Fireworks has a neat feaure where you can take a bitmap and set a filter 'Convert to Alpha' such that it becomes a transparent greyscale.  You can then put this image over the top of another coloured component such that it picks up the underlying colour.  Does anyone know whether it's possible to do the same in Illustrator?
johnalphaoneAsked:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

GreyNoMoreCommented:
Select the bitmap and (using the transparency pallete -- to show it: shift+F10):

- select the way you want it to interact with undelying objects (multiply, screen, overlay... etc) -- if necessary use (with the bitmap selected) Filters->Colors->Convert to Grayscale.

- or, shift-select also the object (or group of objects, doesn't matter -- just be careful that the bitmap stays on top) that should be influenced and click the arrow in the upper right corner of the transparency pallete, and in the menu that appears choose "Make opacity mask".
0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
johnalphaoneAuthor Commented:
Thanks.
0
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Web Graphics Software

From novice to tech pro — start learning today.

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.