Post on 19-May-2015
transcript
Adobe Photoshop CC: The Professional Portfolio
Project 5:
Catalog CoverCreating a complex selection
Compositing complex selections
Working with spot channels
Adobe Photoshop CC: The Professional Portfolio
Complex Selections
Review existing image channels
Duplicate highest-contrast channel
Use filters/ adjustments to edit Alpha channel
Paint directly on Alpha channel to refine
Adobe Photoshop CC: The Professional Portfolio
Color Channels
Grayscale representation of color
In RGB:– Black = 0% of that color– White = 100% of that color– Gray = middle % of that color
In CMYK:– Black = 100% of that color– White = 0% of that color– Gray = middle % of that color
Adobe Photoshop CC: The Professional Portfolio
Alpha Channels
Store complex selections
Store semi-transparent selections
Directly editable
Can be turned on or off
Non-destructive
Adobe Photoshop CC: The Professional Portfolio
Channel Options
By default, color shows selected areas
Choose Masked Areas to show non-selected areas in color
Change channel opacity for on-screen composite preview
Adobe Photoshop CC: The Professional Portfolio
Editing Alpha Channels
If color shows Selected Areas:– Black shows selected pixels
– White shows non-selected pixels
– Gray shows partially selected pixels
Use default foreground and background colors [D]– Paint with the Brush tool [B] and switch
foreground/background as needed [X]
or
– Switch to Eraser tool [E] to “paint” black
Adobe Photoshop CC: The Professional Portfolio
“Other” Filters
Filter>Other submenu– High Pass
– Custom
– Minimum
– Maximum
– Offset
Adobe Photoshop CC: The Professional Portfolio
Creative Adjustments
Image>Adjustments submenu
Apply to composite image or specific channels
Invert Posterize Threshold Equalize
Adobe Photoshop CC: The Professional Portfolio
Compositing
Images automatically converted to working space of target file
Verify color spaces of component images
Check Gamut Warning for color shift
Adobe Photoshop CC: The Professional Portfolio
Compositing (cont’d)
What do you need to accomplish?– How do composite images work together?
– Do they fill the required space?
– Should I create extra pixels to fill in space? Will it be evident?
– Can I cover unwanted/problem areas with something else?
– Does foreground/background image contrast work well?
Adobe Photoshop CC: The Professional Portfolio
Spot Channels
Special ink colors in addition to CMYK
Consistent reproduction of specific color
Added separation, production expense
Typically chosen from printed swatch books
Adobe Photoshop CC: The Professional Portfolio
Spot Channels (cont’d)
Not associated with any Photoshop layer
All content on a specific channel
No vector data
No styles or effects
Can be saved as PSD, TIFF, or DCS