Using PS6

Open New.
I would then like to create a tire-shaped area.
Using the elliptical marquee tool and its constraint (centre/out), I draw the small inner circle. Is there any way I can add a larger outer circle
marquee selection having both selections appearing simultaneously while I paint in the area between them? Any alternate way(s) of doing the same thing?
Thanks for any help.

Sure. You can either add or subtract to a selection by either holding down shift/alt keys while drawing, or by setting the options in the options bar at the top (the little icons at the left side) when the selection tool is selected.

Liv - Russell Brown at www.russellbrown.com had a great tutorial about this using vector shapes in Photoshop.

If you have broadband the QT movie is worth a visit, on the other hand there MAY be a pdf if you are using dial-up

One idea is to create an alpha channel out of your first selection, then transform it (Select|Transform)to make it larger (or smaller) and make an alpha channel out of that. Then you can load the larger alpha channel as a selection, and subtract the smaller alpha channel; optionally create a third alpha channel out of this one and size it if necessary using Select|Transform.

Peace,
Tony

Doh. Duplicate post. See:

YrbkMgr, "Concentric Circle Selections" #1, 11 Jun 2005 6:35 pm </cgi-bin/webx?13@@.3bbadc9c/0>

First make the outer ring, then hold Alt while starting the inner circle, followed by alt-shift (dragging from centre).

I start with the outer circle and fill it. Then with it still selected I use Select>Modify>Contract as often as necessary then hit delete. One doughnut ready for use !!!

Sometimes the above commands do not produce an inner circle that is true enough, so a little repair work is necessary.

Cheap - but cheerful !!!

Ah heck, I'll throw one in too ;-)

1. Create circular shape layer.
2. Select the path with the Path Selection tool.
3. Ctrl+Alt+T, and then Alt+Shift drag a corner node to create duplicate (keep an eye on the percentage in the Options bar).
4. Commit the transformation.
5. Repeat 2 - 4 as often as you like (using the same percentage).

Since I don't know what you want this for, you could simply load each circle as a selection (select the path and Ctrl+Enter) and then fill on a separate layer, or create a new shape layer from each path, etc.

Ok, You guys take it like that?
So let me chime in:

Create a new layer, and make an horizontal selection going from the left to the right and from the bottom quarter to the middle of the image.

Alt+delete to fill it with the foreground color.

Go to filter>distort>polar coordinates and choose rectangular to polar.

Ctrl+click this layer's thumbnail in the layers palette.

Now you can target the layer you wanted to have that donut shape selection applied to.

Do you like to do it standing up in a hammock, Pierre? :)

(Old English joke.)

Lol, I never said that this was a simple way to do it. Nevertheless, it might open some creative paths for Liv...

Come one, give another way to do a doughnut selection, John!

Damn! I was afraid you might say that. I did it in about 4 steps this morning. Now I'll have to go back and try and remember what I did!

Set a centre point.

Holding Ctrl+Alt+Shift use the Elliptical Marquee to make a large circle out from the centre point.

In the options bar click "Subtract from Selection"

Now holding Ctrl+Alt+Shift use the Elliptical Marquee to make a smaller circle out from the same centre point.

Voil!

Sorry John, already suggested that.

Sorry John, already suggested that.




Well you did, but how you described it wasn't quite so specific.

Don. Setting the selection tool's options gets it done, provided the larger/outer circle is selected first, as I think someone else has mentioned. Couldn't get the shift/alt method to work. Thanks.

deebs. Russell Brown is CS2 and PS7 or higher. Maybe when/if I upgrade. Thanks

YrbkMgr, Ouaou! That's relatively complex; I'll try it later to see if it gives any advantages the simpler techniques lack. Thanks.

Mathias. Ah yes! The all-important circle centre. Tricky bit of coordination there; alt, alt/shift, mouse release/key(s)release. Thanks.

Mike. I see what you mean about the off-true inner circle. Easily adjusted. If the background is black and the donut is filled white, then,before adjusting the inner cirle, watch what happens in the white area after a bit. Gets pretty busy, huh? Thanks.

Trevor. I'm not that advanced. Have to bone up on paths.
What do I want to do with this. Hopefully create a bit of a three dimensional illusion, using feathering, or whatever. The object should look like black glass or china. There would be objects in the donut object. Objects like flowers, for example. There would be no 3D illusion to the interior objects, just their faces, but some of the interior objects (faces) should appear to be deeper than other objects in the donut object. Think Oriental vase. Maybe PS is the wrong application for this. Thanks

Pierre and John. I'm taking a break. Back later. Thanks.