Selection & Masks / Marquee Options
Subtitles of the Movie
There are several options that you can add when you are creating a selection. And one of them is the feathering option. Feathering will actually soften the selection edge. And to show you how that might look, I'm first going to create a selection here with no feathering. And fill this with my foreground color, and that's option delete on the Macintosh or Alt delete on the PC. I'm going to deselect, and now I'm going to select that feathering value and I'll just type in 10 and px of course stands for 10-pixels. So with that enabled, I will go ahead and drag out another selection here. And the first thing you should notice is notice how my corners are slightly rounded - indicating that my sharp edged rectangle is going to be slightly softened, and I'll just choose option delete again. And I'll deselect, and you can see the effect - it gets a very soft edge effect. I'll go ahead and undo that and just step backwards to get back to my original cow without a selection, to talk about some other options we have. So I'm going to make sure that my feather is set to 0-pixels. We'll have a very sharp edged selection. If we are using the normal style, that means that I can simply drag out a selection freehand, and change the shape as I am moving along. That's pretty straightforward. Well another option I have is the fixed aspect ratio. And you can see that currently if I choose that, the default values are 1 and 1 for 1 unit of width and 1 unit of height, which of course will generate a square. So I don't even have to hold down a shift key to create this type of effect. So no matter where I move my cursor, all I can do is increase or decrease the size of my square selection. Sometimes I might use this in order to enforce a wide screen TV shape. And for what's it worth, the ratio for wide screen TV is 16 to 9. So if we type in 16 for a value and 9 for the height value, now if I drag out my selection it will be the same aspect ratio as a wide screen TV. And for something like this, I might want to crop right now to get the wide screen TV effect. I'll go ahead and undo that. And deselect, just to talk about a few more options that we have. And another option that I have is fixed size. And when you choose fixed size, the selection marquee tools will generate a precise selection size. So in this case I could type in exactly 300px x 300px, and it will generate a 300 x 300 pixel selection. All I need to do is click once in my document, and I can click and drag around to reposition my precisely sized selection. So I'll go ahead and deselect that to talk about a few more options that we have. And one of them is the anti-aliasing option. Notice that anti-alias is grayed out when I'm using something such as my rectangular marquee tool, because my rectangular marquee tool will always generate vertical and horizontal edges of selections. And for that, I will never have to anti-alias this type of effect. Anti-aliasing will create intermediary blurry edged pixels to generate a sharp edged effect. And believe it or not, if you add some intermediary pixels like that, you will generate a sharper look than a non anti-aliased, which will create a sort of computerized stair stepping effect. And to demonstrate this, I'm going to go ahead and use my elliptical marquee tool with a feathered radius of zero, so that we won't have any artificial feathering. Now I'm just going to go ahead and drag out, you'll see I made a mistake here. So I'm first go to go to normal here, and drag out a selection, and hold down the option key to take away part of that selection. And what I am going to do now is with my anti-alias enabled, I'll go ahead and fill that with my foreground color, so that's option delete And there is my selection filled. And of course, remember I created that using anti-alias. And I'm going to deselect that, and deselect anti-alias and create a similar type of effect. And we'll go ahead and fill this as well and I'll deselect. And now when I zoom-in, you'll see the difference. And you can see that I actually have some intermediary pixels here that have some red values but also some transparent values. And if we move over to the non anti-aliased, you can see that it's simply created either red or no pixel fills. And when you begin to zoom-out you can see that you get that stair stepped effect, when you do not choose anti-aliasing. So generally, it's recommended when you are using a selection tool that you always have anti-alias enabled - unless you want that stair stepped effect. You might choose to disable anti-aliasing if you are generating very sharp type for something like the World Wide Web. So those are some options that you have when using some of these various selection tools, and I would also add to this that these options for feathering and anti-aliasing are also available when we choose other selection tools such as the lasso tool and also the magic wand tool as well. So the same types of effects are available for these other tools as well.
Tutorial Information
| Course: | Adobe Photoshop 7 |
| Author: | Andrew J. Hathaway |
| SKU: | 33329 |
| ISBN: | 1889347272 |
| Release Date: | 2002-09-05 |
| Duration: | 11 hrs / 152 lessons |
| Work Files: |
Yes |
| Captions: | For Online University members only |
| Compatibility: |
Vista/XP/2000, OS X, Linux QuickTime 7, Flash 8 |
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