آموزش فتوشاپ – کانال ها و ماسک ها

Photoshop: Channels and Masks

Learn how to leverage masks and channels to isolate areas of an image for making enhancements. Join Photoshop expert Deke McClelland as he takes you step by step through working with channels and masks in Adobe Photoshop.

First, Deke explains how channels and masks work. Then he shows how to make selections and use the Color Range command and the Focus Area command. Next, he covers refining selections, extracting masks, blending, and mixing.

Additionally, Deke demonstrates how to put all of the layers together into a final composite.

Contents :

Introduction
Welcome to Channels and Masks
Loading Deke’s custom dekeKeys shortcuts
Adjusting the RGB and CMYK color settings
Setting up a pro-level workspace
Thumbnails and transparency
1. How Channels Work
It all starts with a channel
Introducing the Channels panel
How color channels work
Viewing channels in color
How RGB works
Single-channel grayscale
Drafting a mask with Black & White
The other 3-channel mode: Lab
The final color mode: CMYK
How CMYK works
Mask in RGB, copy to CMYK
2. How Masks Work
The alpha channel is home to the mask
The origin of the alpha channel
How masks work
Saving a selection as a layer mask
Creating an alpha channel
The Save Selection as Channel icon
Loading a selection from a channel
Loading a selection from a layer
Loading a selection from a different image
Sweetening the final composition
3. The Color Range Command
The best selection tools are commands
A brief Magic Wand refresher
Introducing the Color Range command
Working in the Color Range dialog box
Localized color clusters
Selecting complex organic details
Using Color Range to augment a mask
Finessing and feathering a layer mask
Creating a zoom effect with Pinch
Isolating Color Range inside a marquee
Inverting everything with type
Increasing the legibility of type
4. Select > Subject
Just choose a command and let it run
Introducing Select > Subject
Select > Subject vs. Color Range
Combining selections
Softening edges with the Blur tool
Smoothing edges with the Smudge tool
Adding depth of field to a background
5. The Focus Area Command
The Hail Mary of automated selections
Edges vs. noise
A brief Quick Selection refresher
Expanding a selection with Select > Similar
Introducing the Focus Area command
Using the Focus Area brush
Focus Area vs. Select > Subject
Bringing in some better hair
Viewing mask and image at the same time
Non-destructive feather and density
Masking a gradient layer
6. Refining Selections and Masks
The joy of automated refinement
Introducing Select and Mask
Applying global refinements
Edge Detection: Radius and Smart Radius
Painting with the Refine Edge brush
Decontaminating colors
Selecting before you refine
The legacy Refine Edge command
Further refining with Refine Mask
Matching the lighting of your scene
7. Extracting Masks from Channels
Mastering channel operations
Introducing the Calculations command
Previewing channels with Calculations
Blending two channels together
Increasing the contrast of a channel
Filling in regions with the Brush tool
Using the Add and Subtract modes
The Black and White Point eyedroppers
Soft Light, Overlay, and Hard Mix
Painting with the Overlay mode
Combining alpha channels to make a mask
8. Compositing: Putting It All Together
The power of compositing
Smooth edges and color fringing
Assigning a shortcut to Refine Edge
Correcting wispy edges with Refine Mask
Bolstering hair or fur with a blended layer
Combining your refined layer masks
Dressing up a bad background
Masking a background image
From alpha channel to filter mask
Darkening a sky with Gradient Overlay
Creating a synthetic snow effect
Enhancing your snowflakes
Adding a snowflake bokeh on the lens
Conclusion
Wrapping it all up