New Feature: Playlist Center! Pick a topic and let our playlists guide the way.

Start learning with our library of video tutorials taught by experts. Get started

Photoshop CC Selections and Layer Masking Workshop
Illustration by

Anti-aliasing and selections


From:

Photoshop CC Selections and Layer Masking Workshop

with Tim Grey

Video: Anti-aliasing and selections

As you work with a variety of the selection tools in PhotoShop, you'll come across the option for anti- alias. So that begs the question, what exactly is anti-aliasing. Well anti-aliasing relates to the shape of pixels. The fact that pixels are squared and therefore have corners. And that can actually create some minor issues when it comes to creating selections. At least if those selections are not comprised of perfectly vertical or horizontal lines. So let's create a visual example of what anti-aliasing is. I'll start off by creating the selection.
Expand all | Collapse all
  1. 1m 27s
    1. Welcome
      1m 27s
  2. 46m 26s
    1. Selections, alpha channels, and layer masks, oh my!
      5m 48s
    2. Anti-aliasing and selections
      6m 6s
    3. The case for not feathering selections
      6m 50s
    4. Adding, subtracting, and intersecting
      7m 31s
    5. Inverting a selection
      3m 4s
    6. Mixing and matching selection tools
      2m 32s
    7. Using Deselect and Reselect
      3m 47s
    8. Temporarily hiding a selection
      2m 7s
    9. Saving and loading selections
      6m 14s
    10. Using the cursor for selections
      2m 27s
  3. 51m 42s
    1. The Rectangular Marquee tool
      8m 24s
    2. The Elliptical Marquee tool
      6m 2s
    3. The Lasso tool
      4m 55s
    4. The Polygonal Lasso tool
      6m 27s
    5. The Magnetic Lasso tool
      10m 9s
    6. The Quick Selection tool
      5m 33s
    7. The Magic Wand tool
      10m 12s
  4. 38m 38s
    1. Selecting the border of an existing selection
      1m 50s
    2. The Color Range command
      7m 19s
    3. Focusing a Color Range selection
      2m 55s
    4. Selecting faces with Color Range
      2m 31s
    5. The Pen tool
      5m 40s
    6. Selecting by luminosity
      3m 39s
    7. Selecting from a channel
      6m 13s
    8. Transforming a selection
      4m 4s
    9. Quick Mask mode
      4m 27s
  5. 50m 46s
    1. Combining layers into a single document
      1m 49s
    2. Layering images manually
      1m 55s
    3. Assembling a panorama automatically
      3m 1s
    4. Advanced blending
      4m 0s
    5. Painting to hide and reveal
      3m 24s
    6. Creating a selection-based composite
      2m 43s
    7. Select, then paint
      3m 28s
    8. Advanced mask cleanup
      6m 18s
    9. Creating an edge-fade effect
      2m 23s
    10. Using a filter to add an artistic edge
      3m 6s
    11. Using a brush effect to add an artistic edge
      5m 30s
    12. Transforming a masked object
      1m 51s
    13. Unlinking image and mask
      2m 53s
    14. Matching composite images
      2m 17s
    15. Adding layer effects with masks
      2m 21s
    16. Reviewing layer masks
      3m 47s
  6. 28m 58s
    1. Painting in an adjustment
      3m 20s
    2. Shades of gray
      3m 14s
    3. Using the Gradient tool
      4m 4s
    4. Adjusting a selected area
      1m 42s
    5. Creating a vignette effect with masking
      2m 13s
    6. Using a layer group
      3m 34s
    7. Working with multiple masks
      4m 5s
    8. Refining an adjustment mask
      6m 46s

Watch this entire course now—plus get access to every course in the library. Each course includes high-quality videos taught by expert instructors.

Become a member
please wait ...
Photoshop CC Selections and Layer Masking Workshop
3h 37m Beginner Jun 25, 2013

Viewers: in countries Watching now:

Learn how to use selections and layer masks in Photoshop to create composite images and apply targeted adjustments. After covering the key concepts behind selections and exploring Photoshop's selection tools, Tim Grey delves into a variety of advanced techniques that will help you make accurate selections, create seamless composite images, and apply adjustments that do exactly what you want them to do.

Topics include:
  • Basic concepts
  • Selection tools
  • Advanced selection techniques
  • Creating composite images
  • Applying targeted adjustments
  • Creating a vignette effect with masking
Subjects:
Photography Masking + Compositing video2brain
Software:
Photoshop
Author:
Tim Grey

Anti-aliasing and selections

As you work with a variety of the selection tools in PhotoShop, you'll come across the option for anti- alias. So that begs the question, what exactly is anti-aliasing. Well anti-aliasing relates to the shape of pixels. The fact that pixels are squared and therefore have corners. And that can actually create some minor issues when it comes to creating selections. At least if those selections are not comprised of perfectly vertical or horizontal lines. So let's create a visual example of what anti-aliasing is. I'll start off by creating the selection.

I'm going to use the Polygonal Lasso tool here, so that I can create a selection that is comprised of straight lines. To access the Polygonal Lasso tool, I'll click on the button for the Lasso tool on the tool box and hold the mouse button down for just a moment. That will bring up the fly out menu associated with the Lasso tool. And from that File menu, I can choose the Polygonal Lasso tool. And I'm going to click on the image here. I have an empty canvas that I've created. That will create my initial anchor point. And then I'll just go downward. I'm going to hold the shift key though to create a perfectly vertical line. And then I'll click once again to define my next anchor point. I'll move over to the right.

Then I'll hold the shift key so that I get a perfectly horizontal line in this case and I'll click on more time and now I'll take my mouse back to my original starting point so that I'm creating a diagonal line and then I'll click on my original point in order to close out that selection. So I've created a selection here that is comprised of a vertical line and a horizontal line and a diagonal line. And all the while, you may have noticed that up on the options bar, the anti-alias check box is turned on. So whatever that anti-aliasing option does, it's doing it to this selection. To see the effect I'll go ahead and fill the selection with black. So I'll just go to the Edit menu.

And I'm going to choose fill. I'll make sure that the use pop up is set to black. And that the blend mode is set to normal. And the opacity is at 100%. And then I'll click the OK button in order to fill that selection with black. I'll then go to the Select menu and choose Deselect, so that we no longer have that selection and we can more clearly see the shape. A shape which, whether we realize it or not, reflects anti-aliasing. So let's create another triangle, this time without anti-aliasing so we can compare the difference. I'll turn off the anti-alias check box up on the Options bar. And I'm going to create another triangle that's very close to this one, so that we'll be able to zoom in and compare them side by side. So I'll click once again up here near where I started the first triangle, I'll hold the Shift key to create a perfectly horizontal line, and I'll roughly align it with the other triangle here.

I'll click to add that anchor point, and I'll move down toward the other triangle, holding the Shift key once again to create a perfectly vertical line, and then I'll click to add that anchor point, and finally come back to my starting point for this triangle. And click once more in order to create the final selection. Once again in the shape of a triangle, just flipped essentially, but it is comprised similarly of a horizontal line, a vertical line, and a diagonal line. But this time, with the anti-alias option turned off. So, I'll go to the edit menu once again and choose fill. And with my same settings, I'll click OK in order to fill that selection with black.

And then once again I'll deselect the selection. Now, zoomed out you might not be able to tell exactly what's going on, or what the difference is between these two triangles. But let's go ahead and zoom in, and get a better sense of what is going on. And admittedly, the result is relatively subtle. But I think still rather helpful in terms of understanding exactly what this anti- aliasing is. The upper triangle of course, has the anti-alias option turned off, and there you can see a very crisp, and distinct zigzag pattern. A stair step pattern, caused by the fact that this selection, of course, reflects pixels.

In other words, it needs to be identified based on actual pixel values. The selection can't cut across the pixels, because the pixels are actually what are being used to define the selection. And so, since pixels are square and therefore have hard edges that have corners, our selection, and therefore, the triangle here, reflects that shape. I'll go ahead and zoom out for just a moment, and then zoom in to the top left corner, here. And you'll notice that, along the edges, the straight lines, we don't have anywhere near as much of a difference. But let's take a closer look at the triangle that was created with the anti-alias option turned on.

You'll still see that stair step pattern you can still see the fact that pixels are at play here. We can see all of the individual little squares, but there's a difference and it's a subtle difference to be sure but it can have a very significant impact on the overall affect and that is that instead of having only black and white pixels. We now have some shades of grey in between, which help to smooth out that jagged line. You could think of it as almost blurring effect, creating a smoother appearance by blurring or averaging out some of those values.

The result is that we don't have a jagged selection edge. I'll zoom out just a little bit. And I think you'll get a much better sense of how much smoother the triangle edge is in the case because that anti-alias option was turned on. Now of course, anti-aliasing is not a significant issue for vertical lines or horizontal lines But more often than not you'll find that your selections are comprised of somewhat random shapes. And so, keeping that anti-aliasing option turned on helps to ensure very smooth results along the edges of those selections.

To be perfectly honest with you, in most cases you're probably going to blue the edge of that selection anyway. But it is still a good idea that whenever the anti-alias option is available for the selection tool you're using, you should turn it on to help ensure smoother edges for your selections.

There are currently no FAQs about Photoshop CC Selections and Layer Masking Workshop.

 
Share a link to this course

What are exercise files?

Exercise files are the same files the author uses in the course. Save time by downloading the author's files instead of setting up your own files, and learn by following along with the instructor.

Can I take this course without the exercise files?

Yes! If you decide you would like the exercise files later, you can upgrade to a premium account any time.

Become a member Download sample files See plans and pricing

Please wait... please wait ...
Upgrade to get access to exercise files.

Exercise files video

How to use exercise files.

Learn by watching, listening, and doing, Exercise files are the same files the author uses in the course, so you can download them and follow along Premium memberships include access to all exercise files in the library.
Upgrade now


Exercise files

Exercise files video

How to use exercise files.

For additional information on downloading and using exercise files, watch our instructional video or read the instructions in the FAQ.

This course includes free exercise files, so you can practice while you watch the course. To access all the exercise files in our library, become a Premium Member.

join now Upgrade now

Are you sure you want to mark all the videos in this course as unwatched?

This will not affect your course history, your reports, or your certificates of completion for this course.


Mark all as unwatched Cancel

Congratulations

You have completed Photoshop CC Selections and Layer Masking Workshop.

Return to your organization's learning portal to continue training, or close this page.


OK
Become a member to add this course to a playlist

Join today and get unlimited access to the entire library of video courses—and create as many playlists as you like.

Get started

Already a member?

Become a member to like this course.

Join today and get unlimited access to the entire library of video courses.

Get started

Already a member?

Exercise files

Learn by watching, listening, and doing! Exercise files are the same files the author uses in the course, so you can download them and follow along. Exercise files are available with all Premium memberships. Learn more

Get started

Already a Premium member?

Exercise files video

How to use exercise files.

Ask a question

Thanks for contacting us.
You’ll hear from our Customer Service team within 24 hours.

Please enter the text shown below:

The classic layout automatically defaults to the latest Flash Player.

To choose a different player, hold the cursor over your name at the top right of any lynda.com page and choose Site preferencesfrom the dropdown menu.

Continue to classic layout Stay on new layout
Exercise files

Access exercise files from a button right under the course name.

Mark videos as unwatched

Remove icons showing you already watched videos if you want to start over.

Control your viewing experience

Make the video wide, narrow, full-screen, or pop the player out of the page into its own window.

Interactive transcripts

Click on text in the transcript to jump to that spot in the video. As the video plays, the relevant spot in the transcript will be highlighted.

Are you sure you want to delete this note?

No

Notes cannot be added for locked videos.

Thanks for signing up.

We’ll send you a confirmation email shortly.


Sign up and receive emails about lynda.com and our online training library:

Here’s our privacy policy with more details about how we handle your information.

Keep up with news, tips, and latest courses with emails from lynda.com.

Sign up and receive emails about lynda.com and our online training library:

Here’s our privacy policy with more details about how we handle your information.

   
submit Lightbox submit clicked
Terms and conditions of use

We've updated our terms and conditions (now called terms of service).Go
Review and accept our updated terms of service.