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Channel basics

  1. Photoshop User Guide
  2. Introduction to Photoshop
    1. Dream it. Make it.
    2. What's new in Photoshop
    3. Edit your first photo
    4. Create documents
    5. Photoshop | Common Questions
    6. Photoshop system requirements
    7. Get to know Photoshop
  3. Photoshop and other Adobe products and services
    1. Work with Illustrator artwork in Photoshop
    2. Work with Photoshop files in InDesign
    3. Substance 3D Materials for Photoshop
    4. Use the Capture in-app extension in Photoshop
  4. Photoshop on the iPad (not available in mainland China)
    1. Photoshop on the iPad | Common questions
    2. Get to know the workspace
    3. System requirements | Photoshop on the iPad
    4. Create, open, and export documents
    5. Add photos
    6. Work with layers
    7. Draw and paint with brushes
    8. Make selections and add masks
    9. Retouch your composites
    10. Work with adjustment layers
    11. Adjust the tonality of your composite with Curves
    12. Apply transform operations
    13. Crop and rotate your composites
    14. Rotate, pan, zoom, and reset the canvas
    15. Work with Type layers
    16. Work with Photoshop and Lightroom
    17. Get missing fonts in Photoshop on the iPad
    18. Japanese Text in Photoshop on the iPad
    19. Manage app settings
    20. Touch shortcuts and gestures
    21. Keyboard shortcuts
    22. Edit your image size
    23. Livestream as you create in Photoshop on the iPad
    24. Correct imperfections with the Healing Brush
    25. Create brushes in Capture and use them in Photoshop on the iPad
    26. Work with Camera Raw files
    27. Create and work with Smart Objects
    28. Adjust exposure in your images with Dodge and Burn
    29. Auto adjustment commands in Photoshop on the iPad
    30. Smudge areas in your images with Photoshop on the iPad
    31. Saturate or desaturate your images using Sponge tool
    32. Content aware fill for iPad
  5. Photoshop on the web (not available in mainland China)
    1. Common questions
    2. System requirements
    3. Keyboard shortcuts
    4. Supported file types
    5. Introduction to the workspace
    6. Open and work with cloud documents
    7. Generative AI features
    8. Basic concepts of editing
    9. Quick Actions
    10. Work with layers
    11. Retouch images and remove imperfections
    12. Make quick selections
    13. Image improvements with Adjustment Layers
    14. Move, transform, and crop images
    15. Draw and paint
    16. Work with Type layers
    17. Work with anyone on the web
    18. Manage app settings
    19. Generate Image
    20. Generate Background
    21. Reference Image
  6. Photoshop (beta) (not available in mainland China)
    1. Get started with Creative Cloud Beta apps
    2. Photoshop (beta) on the desktop
    3. Generate image with descriptive text prompts
    4. Generate background with descriptive text prompts
  7. Generative AI (not available in mainland China) 
    1. Common questions on generative AI in Photoshop
    2. Generative Fill in Photoshop on the desktop
    3. Generative Expand in Photoshop on the desktop
    4. Generative Fill in Photoshop on the iPad
    5. Generative Expand in Photoshop on the iPad
    6. Generative AI features in Photoshop on the web
  8. Content authenticity (not available in mainland China)
    1. Content credentials in Photoshop
    2. Identity and provenance for NFTs
    3. Connect accounts for creative attribution
  9. Cloud documents (not available in mainland China)
    1. Photoshop cloud documents | Common questions
    2. Photoshop cloud documents | Workflow questions
    3. Manage and work with cloud documents in Photoshop
    4. Upgrade cloud storage for Photoshop
    5. Unable to create or save a cloud document
    6. Solve Photoshop cloud document errors
    7. Collect cloud document sync logs
    8. Invite others to edit your cloud documents
    9. Share files and comment in-app
  10. Workspace
    1. Workspace basics
    2. Preferences
    3. Learn faster with the Photoshop Discover Panel
    4. Create documents
    5. Place files
    6. Default keyboard shortcuts
    7. Customize keyboard shortcuts
    8. Tool galleries
    9. Performance preferences
    10. Use tools
    11. Presets
    12. Grid and guides
    13. Touch gestures
    14. Use the Touch Bar with Photoshop
    15. Touch capabilities and customizable workspaces
    16. Technology previews
    17. Metadata and notes
    18. Touch capabilities and customizable workspaces
    19. Place Photoshop images in other applications
    20. Rulers
    21. Show or hide non-printing Extras
    22. Specify columns for an image
    23. Undo and history
    24. Panels and menus
    25. Position elements with snapping
    26. Position with the Ruler tool
  11. Web, screen, and app design
    1. Photoshop for design
    2. Artboards
    3. Device Preview
    4. Copy CSS from layers
    5. Slice web pages
    6. HTML options for slices
    7. Modify slice layout
    8. Work with web graphics
    9. Create web photo galleries
  12. Image and color basics
    1. How to resize images
    2. Work with raster and vector images
    3. Image size and resolution
    4. Acquire images from cameras and scanners
    5. Create, open, and import images
    6. View images
    7. Invalid JPEG Marker error | Opening images
    8. Viewing multiple images
    9. Customize color pickers and swatches
    10. High dynamic range images
    11. Match colors in your image
    12. Convert between color modes
    13. Color modes
    14. Erase parts of an image
    15. Blending modes
    16. Choose colors
    17. Customize indexed color tables
    18. Image information
    19. Distort filters are unavailable
    20. About color
    21. Color and monochrome adjustments using channels
    22. Choose colors in the Color and Swatches panels
    23. Sample
    24. Color mode or Image mode
    25. Color cast
    26. Add a conditional mode change to an action
    27. Add swatches from HTML CSS and SVG
    28. Bit depth and preferences
  13. Layers
    1. Layer basics
    2. Nondestructive editing
    3. Create and manage layers and groups
    4. Select, group, and link layers
    5. Place images into frames
    6. Layer opacity and blending
    7. Mask layers
    8. Apply Smart Filters
    9. Layer comps
    10. Move, stack, and lock layers
    11. Mask layers with vector masks
    12. Manage layers and groups
    13. Layer effects and styles
    14. Edit layer masks
    15. Extract assets
    16. Reveal layers with clipping masks
    17. Generate image assets from layers
    18. Work with Smart Objects
    19. Blending modes
    20. Combine multiple images into a group portrait
    21. Combine images with Auto-Blend Layers
    22. Align and distribute layers
    23. Copy CSS from layers
    24. Load selections from a layer or layer mask's boundaries
    25. Knockout to reveal content from other layers
  14. Selections
    1. Get started with selections
    2. Make selections in your composite
    3. Select and Mask workspace
    4. Select with the marquee tools
    5. Select with the lasso tools
    6. Adjust pixel selections
    7. Move, copy, and delete selected pixels
    8. Create a temporary quick mask
    9. Select a color range in an image
    10. Convert between paths and selection borders
    11. Channel basics
    12. Save selections and alpha channel masks
    13. Select the image areas in focus
    14. Duplicate, split, and merge channels
    15. Channel calculations
  15. Image adjustments
    1. Replace object colors
    2. Perspective warp
    3. Reduce camera shake blurring
    4. Healing brush examples
    5. Export color lookup tables
    6. Adjust image sharpness and blur
    7. Understand color adjustments
    8. Apply a Brightness/Contrast adjustment
    9. Adjust shadow and highlight detail
    10. Levels adjustment
    11. Adjust hue and saturation
    12. Adjust vibrance
    13. Adjust color saturation in image areas
    14. Make quick tonal adjustments
    15. Apply special color effects to images
    16. Enhance your image with color balance adjustments
    17. High dynamic range images
    18. View histograms and pixel values
    19. Match colors in your image
    20. Crop and straighten photos
    21. Convert a color image to black and white
    22. Adjustment and fill layers
    23. Curves adjustment
    24. Blending modes
    25. Target images for press
    26. Adjust color and tone with Levels and Curves eyedroppers
    27. Adjust HDR exposure and toning
    28. Dodge or burn image areas
    29. Make selective color adjustments
  16. Adobe Camera Raw
    1. Camera Raw system requirements
    2. What's new in Camera Raw
    3. Introduction to Camera Raw
    4. Create panoramas
    5. Supported lenses
    6. Vignette, grain, and dehaze effects in Camera Raw
    7. Default keyboard shortcuts
    8. Automatic perspective correction in Camera Raw
    9. Radial Filter in Camera Raw
    10. Manage Camera Raw settings
    11. Open, process, and save images in Camera Raw
    12. Repair images with the Enhanced Spot Removal tool in Camera Raw
    13. Rotate, crop, and adjust images
    14. Adjust color rendering in Camera Raw
    15. Process versions in Camera Raw
    16. Make local adjustments in Camera Raw
  17. Image repair and restoration
    1. Remove objects from your photos with Content-Aware Fill
    2. Content-Aware Patch and Move
    3. Retouch and repair photos
    4. Correct image distortion and noise
    5. Basic troubleshooting steps to fix most issues
  18. Image enhancement and transformation
    1. Replace sky in your images
    2. Transform objects
    3. Adjust crop, rotation, and canvas size
    4. How to crop and straighten photos
    5. Create and edit panoramic images
    6. Warp images, shapes, and paths
    7. Vanishing Point
    8. Content-aware scaling
    9. Transform images, shapes, and paths
  19. Drawing and painting
    1. Paint symmetrical patterns
    2. Draw rectangles and modify stroke options
    3. About drawing
    4. Draw and edit shapes
    5. Painting tools
    6. Create and modify brushes
    7. Blending modes
    8. Add color to paths
    9. Edit paths
    10. Paint with the Mixer Brush
    11. Brush presets
    12. Gradients
    13. Gradient interpolation
    14. Fill and stroke selections, layers, and paths
    15. Draw with the Pen tools
    16. Create patterns
    17. Generate a pattern using the Pattern Maker
    18. Manage paths
    19. Manage pattern libraries and presets
    20. Draw or paint with a graphics tablet
    21. Create textured brushes
    22. Add dynamic elements to brushes
    23. Gradient
    24. Paint stylized strokes with the Art History Brush
    25. Paint with a pattern
    26. Sync presets on multiple devices
    27. Migrate presets, actions, and settings
  20. Text
    1. Add and edit the text
    2. Unified Text Engine
    3. Work with OpenType SVG fonts
    4. Format characters
    5. Format paragraphs
    6. How to create type effects
    7. Edit text
    8. Line and character spacing
    9. Arabic and Hebrew type
    10. Fonts
    11. Troubleshoot fonts
    12. Asian type
    13. Create type
  21. Filters and effects
    1. Use the Blur Gallery
    2. Filter basics
    3. Filter effects reference
    4. Add Lighting Effects
    5. Use the Adaptive Wide Angle filter
    6. Use the Oil Paint filter
    7. Use the Liquify filter
    8. Layer effects and styles
    9. Apply specific filters
    10. Smudge image areas
  22. Saving and exporting
    1. Save your files in Photoshop
    2. Export your files in Photoshop
    3. Supported file formats
    4. Save files in graphics formats
    5. Move designs between Photoshop and Illustrator
    6. Save and export video and animations
    7. Save PDF files
    8. Digimarc copyright protection
  23. Color Management
    1. Understanding color management
    2. Keeping colors consistent
    3. Color settings
    4. Duotones
    5. Work with color profiles
    6. Color-managing documents for online viewing
    7. Color-managing documents when printing
    8. Color-managing imported images
    9. Proofing colors
  24. Web, screen, and app design
    1. Photoshop for design
    2. Artboards
    3. Device Preview
    4. Copy CSS from layers
    5. Slice web pages
    6. HTML options for slices
    7. Modify slice layout
    8. Work with web graphics
    9. Create web photo galleries
  25. Video and animation
    1. Video editing in Photoshop
    2. Edit video and animation layers
    3. Video and animation overview
    4. Preview video and animations
    5. Paint frames in video layers
    6. Import video files and image sequences
    7. Create frame animations
    8. Creative Cloud 3D Animation (Preview)
    9. Create timeline animations
    10. Create images for video
  26. Printing
    1. Print 3D objects
    2. Print from Photoshop
    3. Print with color management
    4. Contact Sheets and PDF Presentations
    5. Print photos in a picture package layout
    6. Print spot colors
    7. Print images to a commercial printing press
    8. Improve color prints from Photoshop
    9. Troubleshoot printing problems | Photoshop
  27. Automation
    1. Creating actions
    2. Create data-driven graphics
    3. Scripting
    4. Process a batch of files
    5. Play and manage actions
    6. Add conditional actions
    7. About actions and the Actions panel
    8. Record tools in actions
    9. Add a conditional mode change to an action
    10. Photoshop UI toolkit for plug-ins and scripts
  28. Troubleshooting
    1. Fixed issues 
    2. Known issues
    3. Optimize Photoshop performance
    4. Basic troubleshooting
    5. Troubleshoot crash or freeze
    6. Troubleshoot program errors
    7. Troubleshoot scratch disk full errors
    8. Troubleshoot GPU and graphics driver issues
    9. Find missing tools
    10. Photoshop 3D | Common questions around discontinued features

About channels

Channels are grayscale images that store different types of information:

  • Color information channels are created automatically when you open a new image. The image’s color mode determines the number of color channels created. For example, an RGB image has a channel for each color (red, green, and blue) plus a composite channel used for editing the image.

  • Alpha channels store selections as grayscale images. You can add alpha channels to create and store masks, which let you manipulate or protect parts of an image. (See About masks and alpha channels.)

  • Spot color channels specify additional plates for printing with spot color inks. (See About spot colors.)

    An image can have up to 56 channels. All new channels have the same dimensions and number of pixels as the original image.

    The file size required for a channel depends on the pixel information in the channel. Certain file formats, including TIFF and Photoshop formats, compress channel information and can save space. The size of an uncompressed file, including alpha channels and layers, appears as the right-most value in the status bar at the bottom of the window when you choose Document Sizes from the pop‑up menu.

 

Note:

As long as you save a file in a format supporting the image’s color mode, the color channels are preserved. Alpha channels are preserved only when you save a file in Photoshop, PDF, TIFF, PSB, or raw formats. DCS 2.0 format preserves only spot channels. Saving in other formats may cause channel information to be discarded.

Channels panel overview

The Channels panel lists all channels in the image—composite channel first (for RGB, CMYK, and Lab images). A thumbnail of the channel’s contents appears to the left of the channel name; the thumbnail is automatically updated as you edit the channel.

Photoshop Channel types
Channel types

A. Color channels B. Spot channels C. Alpha channels 

Display the Channels panel

  1. Choose Windows > Channels.

Resize or hide channel thumbnails

  1. Choose Panel Options from the Channels panel menu. Click a thumbnail size or click None to turn off the display of thumbnails.

    Viewing thumbnails is a convenient way of tracking channel contents; however, turning off the display of thumbnails can improve performance.

Show or hide a channel

You can use the Channels panel to view any combination of channels in the document window. For example, you can view an alpha channel and the composite channel together to see how changes made in the alpha channel relate to the entire image.

  1. Click in the eye column next to the channel to show or hide that channel. (Click the composite channel to view all default color channels. The composite channel is displayed whenever all the color channels are visible.)
    Note:

    To show or hide multiple channels, drag through the eye column in the Channels panel.

Show color channels in color

Individual channels are displayed in grayscale. In RGB, CMYK, or Lab images, you can view the individual channels in color. (In Lab images, only the a and b channels appear in color.) If more than one channel is active, the channels always appear in color.

You can change the default to show the individual color channels in color. When a channel is visible in the image, an eye icon  appears to its left in the panel.

  1. Do one of the following:
    • In Windows, choose Edit > Preferences > Interface.

    • In Mac OS, choose Photoshop > Preferences > Interface.

  2. Select Show Channels In Color, and click OK.

Select and edit channels

You can select one or more channels in the Channels panel. The names of all selected, or active, channels are highlighted.

Photoshop Select multiple channels
Selecting multiple channels

A. Not visible or editable B. Visible but not selected for editing C. Selected for viewing and editing D. Selected for editing but not viewing 

  • To select a channel, click the channel name. Shift-click to select (or deselect) multiple channels.
  • To edit a channel, select it and then use a painting or editing tool to paint in the image. You can paint on only one channel at a time. Paint with white to add the selected channel’s color at 100% intensity. Paint with a value of gray to add the channel’s color at a lower intensity. Paint with black to fully remove the channel’s color.

Rearrange and rename alpha and spot channels

You can move alpha or spot channels above the default color channels only if the image is in Multichannel mode (Image > Mode > Multichannel). For information about that mode’s limitations, see Multichannel mode.

  • To change the order of alpha or spot channels, drag the channel up or down in the Channels panel. When a line appears in the position you want, release the mouse button.
Note:

Spot colors are overprinted in the order of their appearance from top to bottom in the Channels panel.

  • To rename an alpha or spot channel, double-click the channel’s name in the Channels panel, and enter a new name.

For more information, see Create a new spot channel.

Delete a channel

You may want to delete spot or alpha channels you no longer need before saving an image. Complex alpha channels can substantially increase the disk space required for an image.

  1. In Photoshop, select the channel in the Channels panel and do one of the following:
    • Alt-click (Windows) or Option-click (Mac OS) the Delete icon .

    • Drag the channel name in the panel to the Delete icon.

    • Choose Delete Channel from the Channels panel menu.

    • Click the Delete icon at the bottom of the panel, and then click Yes.

    Note:

    When you delete a color channel from a file with layers, visible layers are flattened and hidden layers are discarded. This is done because removing a color channel converts the image to Multichannel mode, which does not support layers. An image isn’t flattened when you delete an alpha channel, a spot channel, or a quick mask.

 Adobe

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