Archive for the ‘photoshop’ Category

Techie Tip of the Week: Non-Destructive Photo Editing Using Photoshop Adjustment Layers

Friday, May 3rd, 2013

When you edit a photo in Photoshop using one of the image adjustment tools like Hue/Saturation or Brightness/Contrast, the image’s pixels are physically altered. This means that if you change the Hue, save, and then change the Hue again, the image’s quality will suffer.

What can you do to limit the damage? Use Photoshop’s Adjustment Layers instead. Adjustment Layers provide the exact same editing abilities as the standard image adjustments, but they allow you to edit non-destructively on your images.

To use Adjustment Layers:

  1. In Photoshop, choose Layer.
  2. Select New Adjustment Layer.
  3. Select the desired adjustment layer type (e.g., Hue/Saturation).

20130504-171508.jpg

Techie Tip of the Week: Change the Color of an Object in Photoshop

Friday, February 1st, 2013

Have you ever wished you could change the color of a part of your photos in Photoshop? Ever wanted to see what that shirt or dress would have looked like as a different color? By modifying the hue of the object using an image editing tool like Photoshop, you can!

Here’s how:

  1. In Photoshop (or other image editing program), open the image and select the desired object. In this example, I’m going to change the color of the car from red to blue.

  2. Change the Hue (in Photoshop, under Image, select Adjustments, and then Hue/Saturation).

  3. Adjust the Hue until the object matches your desired color:

Techie Tip of the Week: Use Puppet Warp to Manipulate Photos in Photoshop

Friday, May 11th, 2012

The Puppet Warp tool in Photoshop allows you to manipulate and distort specific image areas of an image while keeping other areas exactly as they are.

You can use Puppet Warp to do small manipulations, such as straightening walls, moving hair, and the like. You can also use Puppet Warp to do major alterations to the photo, such as repositioning arms and legs.

To use Puppet Warp, the section you wish to manipulate must be in a layer other than the default Background Layer.

For example, to turn the Mona Lisa’s smile into a frown:

  1. Open the photo in Photoshop (Puppet Warp is a feature in CS 5 and newer).
    mona lisa smiling
  2. Change the Background into a regular layer (Layer > New > Layer from Background).
  3. Select the portion you wish to warp (in this case, the smiling area).
    mona lisa -- smile selected
  4. On the Edit menu, select Puppet Warp.
  5. In the meshed area, click to select the “joints” you will use to warp the photo.
    mona lisa - joints selected
  6. Drag the “joints” to manipulate the photo until you achieve the desired result:
    mona lisa - sad face

Techie Tip of the Week: Use Content-Aware Scaling to Resize Images

Friday, May 4th, 2012

In Adobe Photoshop CS4 and newer, you can use Content-Aware Scaling to resize an image without distorting or changing surrounding content like people, buildings, animals, and so forth. Normally, when you scale an image, all of the pixels are uniformly modified. But with Content-Aware Scaling, Photoshop intelligently figures out what’s most important and only resizes those parts that aren’t (grass, sidewalks, water, and the like).

To use this feature:

  1. Select the photo (or part of the photo).
  2. On the Edit menu, select Content Aware Scale.
  3. Click and drag to obtain the effect you desire. Note that there are properties you can change in the properties palette for Content Aware Scale.
  4. Save!

For example, here is the original photo of Vincent Van Gogh’s painting of his bedroom:

Vincent Van Gogh's Bedroom

Original version of Vincent Van Gogh's Bedroom

Here is a version of this painting scaled using Content-Aware Scaling:

Van Gogh's painting of his bedroom scaled using Content Aware Scaling

Van Gogh's painting of his bedroom scaled using Content Aware Scaling

And here is what the same picture would look like using traditional scaling (using Image>Image Size or Edit>Transform):

Van Gogh's painting of his bedroom scaled using traditional scaling methods

Van Gogh's painting of his bedroom scaled using traditional scaling methods

Note the bed, pillows, paintings, chairs, and the objects on the table look relatively normal when using Content-Aware Scaling, but look squished, flattened, and distorted when scaled using traditional scaling methods. Content Aware Scaling keeps the important objects (in this case, the bed, pillows, paintings, chairs, and objects on the tables) looking as they originally did while only resizing the relatively unimportant objects (in this case, the floor and walls).

Techie Tip of the Week: Making Part of a Photo Transparent in Photoshop

Friday, April 13th, 2012

Have you ever wanted to take out part of a photograph and make the deleted part transparent but were disappointed because Photoshop made the deleted part white? This week’s tip will show you how to make your deleted sections transparent!

Let’s say we want to take the photo of the house and change all of the windows to show the green background of our web page.

photo of a house

  1. In Photoshop, open the photo of the house.
  2. Unlock the background layer by doing the following:
    • Layer>New>Layer from background
      Screen shot of Layer > Layer from background
    • Click OK.
      Screenshot of clicking OK
  3. Select and delete all of the windows.
    house wth windows deleted
  4. Save the image as a PNG (if it’s a photo) or Compuserve GIF (if it’s a button, line art, or other image with fewer than 256 colors). Be sure to select Interlaced.
    interlace

That’s it! Now, if we place this photo in our web page, the windows will “bleed” through:

House with green windows

Techie Tip of the Week: Creating Mask Using Text (in Photoshop)

Friday, October 14th, 2011

Last week we talked about creating masks in Photoshop. This week, we’d like to focus on a specific type of masks that you can use in Photoshop — creating a mask using text. This can allow you to take text and have a picture be the background of that text.

In this week’s example, we’ll take a photograph of a fire and use that to write text that will look like it was created using a “fire” font.

  1. In Photoshop, open the photo that will serve as the background of the text.
    Screenshot of photo of fire opened in Photoshop
  2. Unlock the background layer by right-clicking the Background layer and selecting Layer From Background.
    Screenshot of Layer from Background screenshot of layer0
  3. Type some text on the photo.
    screenshot of adding text
  4. In the text layer, right-click the layer and select Convert to Shape to convert it into a shape.
    screenshot of the "this is really cool" layer screnshot of convert to shape
  5. In the shape layer (in the example, This is really…), click the chain link to unlink the vector mask.
    screenshot of unchaining

  6. In the shape layer (This is really…), drag the shape into the photo layer (Layer 0).
    screenshot of dragging layers screenshot of layer0

  7. Delete the original shape layer (This is really…) by right-clicking the layer (This is really…) and selecting Delete Layer.  Click Yes.
    screenshot of deleting original text layer 1 screenshot of deleting layerclick "yes"

Here’s the final result:

final result

Techie Tip of the Week: Creating a Mask in Photoshop

Friday, October 7th, 2011

In Photoshop, masks are used to hide sections of a photograph. Once you have hidden from view the parts you don’t want seen, you can take what is left and display them as desired. For example, you can take a photograph of a person, create a mask showing only that person, and then place the mask on top of a scene in which the person really wasn’t present (but now looks like the person was there). Or, you can create an effect that makes it look like the viewer is seeing the subject using binoculars.

In this example, we’ll take a photo of a house with the driveway and shrubs and create a mask to make it look like we’re looking at the house using a telescope.

Here’s one way to create a mask in Photoshop:

  1. Open your picture in Photoshop.
    Orginal file of the house
  2. Unlock the background layer by doing the following:
    • Layer>New>Layer from background
      Screen shot of Layer > Layer from background
    • Click OK.
      Screenshot of clicking OK
  3. Create the shape of the mask using text or one of the vector drawing tools (pen, freeform pen, rectangle tool, etc.  In this example, I’m using the Elipse Tool).
    screenshot of mask shape (in this case, an oval)
  4. Under Window, make sure the Layers is checked.
    screen shot of Window>Layers
  5. In the shape layer (in the example, Shape 1), click the chain link to unlink the vector mask.
    screen shot of linked shape to black layer screenshot of unchained layer and shape
  6. In the shape layer (Shape 1), drag the shape into the picture layer (Layer 0).
    screenshot of dragging shape 1 to layer 0 (1 of 3) screenshot of dragging shape 1 to layer 0 (2 of 3) screenshot of dragging shape 1 to layer 0 (3 of 3)
  7. Delete the original shape layer (Shape 1) by selecting the layer (Shape 1) and clicking the Trash Can icon.  Click Yes.
    screen shot of deleting shape1 layer →  screenshot of clicking Yes
  8. Use the move tool move tool to move the picture to the position you desire.
    Position 1 position 2
  9. If desired, in the picture layer, click in between the picture and the shape to link the mask together.
    screenshot of linking picture to shape layer (1 of 2) screenshot of linking picture to shape layer (2 of 2)

Techie Tip of the Week: gimp.org

Friday, September 2nd, 2011

Did you know that there is a free, open source, fully featured alternative to Photoshop?

The Gnu Image Manipulation Program is a fully-featured, sophisticated desktop-based image editing and manipulation tool. In many ways, the GIMP rivals and even exceeds the capabilities of Photoshop (especially if you download and install the many and varied plugins for GIMP).

The GIMP is available for Windows, Mac, and Linux.

More information, including download, and installation instructions is found on the GIMP website:
http://www.gimp.org

To enhance functionality in the GIMP, visit the Plug-in Registry:
http://registry.gimp.org/

For documentation on using GIMP visit the docs section:
http://www.gimp.org/docs/

My favorite GIMP plugins:

Liquid Rescale: http://registry.gimp.org/node/144

  • This plugin performs content-aware scaling  in GIMP (and preceded Photoshop’s ability to do so by at least a year!)
  • Video Example of Liquid Rescale: http://bit.ly/ohiXi0

Resynthesizer: http://registry.gimp.org/node/25219

  • This plugin performs content-aware fill in GIMP (and preceded Photoshop’s ability to do so by years!)
  • Video Example of Resynthesizer: http://bit.ly/pckIM4

Techie Tip of the Week – Photoshop: Using Content-Aware Fill to Remove Unwanted Material

Friday, April 8th, 2011

Need to remove something from your photograph and make it look like it never was there in the first place? Photoshop CS4 and CS5′s Content Aware Fill is just what you need!

  1. In Photoshop, open the image.
  2. Using one of the selection tools, select the part of the image you wish to remove. In this example, we’ll remove the legs of the players in the upper part of the image.By Johnmaxmena (talk)john mena.Johnmaxmena at en.wikipedia [Public domain], from Wikimedia Commons
  3. On your keyboard, press the Delete key (or, on the Edit menu, choose Fill). The Fill window appears.
    1. In the Contents section, in the field Use, select Content-Aware.
    2. In the Blending section, in the field Mode, select Normal and Opacity 100%.
    3. Click OK.

The unwanted portion of your photo will no longer appear – Photoshop analyzes the contents of the photo and attempts to figure out what the photo would have looked like if they had never been there.

In this example, note, however, that the shadows of the unwanted players still exist – repeat the same steps to eliminate the shadows.

By Johnmaxmena (talk)john mena.Johnmaxmena at en.wikipedia [Public domain], from Wikimedia Commons

    Want to learn more great Photoshop tips? Come take our class Photoshop 101 on April 11, or Photoshop Level 1 on May 16!

    For more information on the classes, watch the course preview video , or visit http://techtraining.stanford.edu/.

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Techie Tip of the Week: Photoshop – Adding Drop Shadows

Friday, February 25th, 2011

Want to add some pizazz to your text or photo? Consider adding a drop shadow!

  1. In Photoshop, open the image.Stanford University
  2.  

  3. In Layers, right-click (on a Mac, control-click) the layer containing the part of the image on which you want the drop shadow to appear and click Blending Options.
    In Photoshop, choose Layers -> Blending Options
  4.  

  5. Check the box Drop Shadow.
    • In Structure, adjust the Blend Mode, Opacity, Angle, Distance, Spread, and Size as desired.
    • In Quality, choose the desired Contour and Noise percentage.

    In Layer Style, in Drop Shadow, choose desired Structure and Quality

  6. Click  OK.

 

Stanford University (no shadow) --> Stanford University (with shadow)

Drop Shadow Example

 

Want to learn more great Photoshop tips? Come take our class Photoshop 101 on March 24, Photoshop Level 1 on February 28, or Photoshop Level 2 on March 10!

For more information on the classes, watch the course preview video , or visit http://techtraining.stanford.edu/.

Play Video

Course Preview