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A short tutorial on the usage of layers




                                     1
           What are layers?
• Layers are multiple images on top of each
  others.
• Each image can be manipulated
  independently of others in the layered
  image.
• There are many different types of layers.
  – Background, Raster, Vector, Adjustment and
    Mask
                                                 2
              Type of layers
• Background Layer
  – Bottom layer of an image
  – Contains raster data but cannot display
    transparency.
  – Cannot change its order in a stack, its blend
    mode or its opacity.
  – All JPG image are considered a single
    background layer image.

                                                    3
              Type of layers
• Raster Layers
  – Raster layers are layers with raster data - or
    data that is composed of individual elements,
    called pixels, arranged in a grid, each with a
    specific location and color.
  – Photographic images are composed of raster
    data.
  – Digital cameras take pictures in raster format.

                                                      4
                 Type of layers
• Vector Layers
  – Contains only vector objects
     •   lines, curves
     •   shapes
     •   texts
     •   vector groups
  – Use a vector layers to create objects or text that
    you can easily edit.

                                                         5
               Type of layers
• Adjustment Layers
  – Adjustment layers are correction layers that
    adjust the color or tone of underlying layers.
     • Some examples of an adjustment layer type
        – Brightness/Contrast        - Color Balance
        – Hue/Saturation/Lightness   - Curves
        – Levels                     - Many others...
  – Adjustment layers cannot be a background
    layer.
                                                        6
              Type of layers
• Mask Layers
  – Mask layers show or hide portions of
    underlying layers.
  – Mask layers are really an adjustment layer that
    modifies opacity.
  – Can create sophisticated effects such as
    collages.


                                                      7
      Sample usage of Layers
• Preserve the original image before making
  changes.
  – Just duplicate the background layer.
  – Turn off the visibility of the background layer.
  – Make only changes to the duplicated layer.




                                                       8
      Sample usage of Layers
• Make color and tonal corrections
  – Use adjustment layers
  – This preserve the original image from being
    modified.
  – Adjustment layers can be turned on and off to
    differentiate the adjustment from the original.



                                                      9
      Sample usage of Layers
• Add text or graphics
  – Add them as vector objects to a new vector
    layer.
  – Can be easily modified.
  – If they are added to a raster layer, they become
    part of the image and can be hard to modify.



                                                       10
      Sample usage of Layers
• Create a photo collage
  – Place each photograph on a different layer.
  – Use the layer’s opacity setting and blend mode
    to control how much of each layer shows
    through.
  – Use mask to hide parts of a layer or create soft
    edges around a layer.


                                                       11
Part I: Simple Adjustment Layer
         Sample Tutorial




                              12
Part I: Open up image to process




                                   13
Part I: Insert new levels adjustment layer




                                             14
Part I: Experiment with the levels setting...


                                                   Toggle
                                                  the eyes.




                                Play with the transparency
                                     (opacity) slider.


                                                              15
Part II: Blending two images automatically




                                         16
Part II: First open the two images.
             2. Then make a copy of the bird image and paste it onto the
             background as a new raster layer.




                                                                           17
  Part II: Experiment with the transparency slider




Bird Transparency at 100%   Bird Transparency at 50%   Bird Transparency at 10%



                                                                            18
  Part II: Experiment with the blending type




Blending type: Darken   Blending type: Lighten   Blending type: Hue




                                                                 19
Part III: Using Mask Layers to make collages




                                               20
Part III: First select an image as a background layer.
                                          2. Then open up the
                   Move the new raster
                   layer to the desired   first image and copy it
                         location.        into the background
                                          image as a new raster
                                          layer. See Part II for
                                          the steps. Use the
                                          directional arrow to
                                          move the new raster
                                          image around.




                                                                21
Part III: Create a mask sub-layer to the raster layer.
                               Click on the Mask button
                               denoted by the arrow on the
                               layers window to the lower
                               left.




                                                         22
          Part III: Set up the tools for masking.
                         1. Mask automatically turns
                         the palette to 256 shades
                         of gray. Make sure the
                         darkest point is black and
                         the lightest point is white.
2. Select the airbrush
tool from the tools
menu bar on the left.

                         3. Set airbrush size to 30
                         and opacity to 100.




                                                        23
Part III: Now paint away the unwanted portion of the image.
                                    Slowly airbrush away the
                                    portion of the image you do
                                    not want. Change the brush
                                    size on the airbrush toolbar
                                    when you want to fine tune
                                    the masking. If you make a
                                    mistake, just use the other
                                    mouse button to restore what
                                    you brushed out...




                                      From time to time, hover the mouse
                                      over the mask layer to see the area
                                      where the raster image was masked.
                                                                     24
Part III: Once you are done with the mask, you can move it
             around the background image to reposition it..




Use the move tool to
move the mask around
to the desired location.




                                                              25
Part III: Open the next image, copy it and paste into the main
image as a new layer. Our layer should have three images now. The
background, the raster layer 1 and now the raster layer 2. To make it
           easier to remember, you can name your layers.



                                                    As always, you
                                                    can use the mover
                                                    tool to move the
                                                    new raster layer
                                                    to the desired
                                                    location before
                                                    processing it.




                                                                        26
     Part III: To make this layer a little different, lets resize the layer
                        before we convert it into a mask.



Ignore the pixel
width and height,
resize to the
dimensions only.

NOTE: Uncheck
“Resize all layers”.




                                                                         27
Part III: Repeat the steps in page 22 through 25 for this image
                      and all other images.


                                 Continue to work on the
                                 remaining images...




                                           To make it less confusing when
                                           masking a layer, turn the visibility
                                           of the other layers off by clicking
                                           on the “eye” visibility icon. A red
                                           “X” on an eye means that layer is
                                           invisible. To return visibility, click
                                           on the “eye” again.

                                                                             28
Part III: The complete collage




                                 29
Questions?




             30

				
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posted:12/12/2011
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