Advanced Masks Exercise: Creating and Editing Masks in Photoshop - Prof. Peter L. Hoelter | Assignments Communication

VC 251 :: Week 03 1 of 3 16 October 2008

— Advanced Masks Exercise —

exercise::04

Advanced Masks

= Indicates a step for which the instructions have not been completely presented.

1. Locate a folder called Lab_Resources_04 in the instructor’s Handouts folder on

XServe (XServe > Class Folders > VC 251 > Handouts). Rename the folder on

your computer using your name in the following format: lastname_firstname_04.

2. Open the Orange_Boat.psd file in Photoshop.

3. Choose Color Range… from the Select menu and set the Fuzziness to 200.

Using this dialog box, try to select only the orange boat. To select a color to

sample around, simply click on an area of the boat. Click OK when done.

Some hints:

a. Try light, dark and middle orange values, finally selecting the one that

produced the best results.

b. Try changing the Selection Preview to White Matte or Grayscale. This

will help you see how well isolated the boat is.

4. Save the current selection as an Alpha channel. Choose Save Selection… from

the Select menu, and name this channel Boat only. Deselect the current

selection (Command-D).

5. Using the Channels palette, select the Boat Only channel. You should see a

grayscale version of the image with the boat looking “ghosty”.

6. Select Image > Adjustments > Levels… (Command-L) and alter the white

and black points of the channel to dramatically increase the contrast of the

channel. When done the black and white points should be close to each other:

The boat image should be nearly completely white, and the rest pure black.

Click OK when done. Experiment with different “meeting points” (where along

the Histogram the Highlight and Shadow points meet) and with how close the

two points are.

7. Examine closely the edges of the mask (where black meets white) and make

sure they appear anti-aliased. If not, redo Step 06, making a less-dramatic

adjustment to the channel.

8. If needed, use the Brush tool to make final tweaks to the channel so that only

the orange boat is selected. It might help to toggle the visibility of the

composite RGB channel to view the Alpha channel in a manner similar to

QuickMask mode.

9. Command-click on the icon for the Boat only channel in the Channels palette.

This loads the channel as the current selection (same as Select > Load

Selection…). Click on the composite RGB channel (Command-~) to view the

image normally. Hide the Boat only channel if it still appears on screen.

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exercise::

Advanced Masks

= Indicates a step for which the instructions have not been completely presented.

Locate a folder called Lab_Resources_04 in the instructor’s Handouts folder on XServe (XServe > Class Folders > VC 251 > Handouts). Rename the folder on your computer using your name in the following format: lastname_firstname_04.
Open the Orange_Boat.psd file in Photoshop.
Choose Color Range… from the Select menu and set the Fuzziness to 200. Using this dialog box, try to select only the orange boat. To select a color to sample around, simply click on an area of the boat. Click OK when done. Some hints: a. Try light, dark and middle orange values, finally selecting the one that produced the best results. b. Try changing the Selection Preview to White Matte or Grayscale. This will help you see how well isolated the boat is.
Save the current selection as an Alpha channel. Choose Save Selection… from the Select menu, and name this channel Boat only. Deselect the current selection (Command-D).
Using the Channels palette, select the Boat Only channel. You should see a grayscale version of the image with the boat looking “ghosty”.
Select Image > Adjustments > Levels… (Command-L) and alter the white and black points of the channel to dramatically increase the contrast of the channel. When done the black and white points should be close to each other: The boat image should be nearly completely white, and the rest pure black. Click OK when done. Experiment with different “meeting points” (where along the Histogram the Highlight and Shadow points meet) and with how close the two points are.
Examine closely the edges of the mask (where black meets white) and make sure they appear anti-aliased. If not, redo Step 06, making a less-dramatic adjustment to the channel.
If needed, use the Brush tool to make final tweaks to the channel so that only the orange boat is selected. It might help to toggle the visibility of the composite RGB channel to view the Alpha channel in a manner similar to QuickMask mode.
Command-click on the icon for the Boat only channel in the Channels palette. This loads the channel as the current selection (same as Select > Load Selection…). Click on the composite RGB channel (Command-~) to view the image normally. Hide the Boat only channel if it still appears on screen.

Select Layer > New Adjustment Layer > Hue/Saturation…. Name this adjustment layer Color Shift.
Alter the hue and saturation of the boat to give the boat a new color. Experiment with colorizing the bowls with the Colorize option checked as well as with it unchecked. Compare the new and old versions of the photo by toggling the visibility of BOTH the Color Shift layer and of the layer mask attached to that layer (shift-click on the layer mask thumbnail icon). Make sure your new color looks true and believable.
Save your work and close the file.
Open the Blue_Bowls.psd file in Photoshop.
Repeat Steps 03 thru 11 above using the Blue Bowls image. This image will require a bit more manual tweaking with the Brush tool to make a mask that captures just the bowls. When you name the saved selection as an Alpha channel, name that channel Bowls only.
In the Channels palette, duplicate the Bowls only channel by either dragging it onto the new channel icon in the palette, or right (or control)-click on the Alpha channel and select Duplicate Channel…. Name this channel Lonely Bowl.
In the Layers palette, click on the layer mask thumbnail on the Color Shift layer, selecting it.
Using the Brush tool with black and white colors, bring back the original color of the second bowl from the front (the one eclipsed by the large bowl in the front) by adding to the layer mask (using black as a brush color).
In the Layers palette, command-click on the layer mask thumbnail icon on the Color Shift layer, loading the mask as the current selection.
Choose Save Selection… from the Select menu. Change two options in this dialog box: For the Channel option, select Lonely Bowl; and under Operation, select Subtract from Channel.
Command-click on the icon for the Lonely Bowl channel in the Channels palette, then create a new Hue/Saturation adjustment layer. Once again, alter the hue of the bowl so that it is difference than existing bowls. Name this layer Color Shift Lonely.
Returning to the original Color Shift adjustment layer, select its layer mask and restore the original color to the bowl located at the top-left of the image.
Save your work and close the file.
Open the Yellow_Flower.psd file in Photoshop.

Advanced Masks Exercise: Creating and Editing Masks in Photoshop - Prof. Peter L. Hoelter, Assignments of Communication

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exercise::

Advanced Masks