- Photoshop User Guide
- Introduction to Photoshop
- Photoshop and other Adobe products and services
- Photoshop on the iPad (not available in mainland China)
- Photoshop on the iPad | Common questions
- Get to know the workspace
- System requirements | Photoshop on the iPad
- Create, open, and export documents
- Add photos
- Work with layers
- Draw and paint with brushes
- Make selections and add masks
- Retouch your composites
- Work with adjustment layers
- Adjust the tonality of your composite with Curves
- Apply transform operations
- Crop and rotate your composites
- Rotate, pan, zoom, and reset the canvas
- Work with Type layers
- Work with Photoshop and Lightroom
- Get missing fonts in Photoshop on the iPad
- Japanese Text in Photoshop on the iPad
- Manage app settings
- Touch shortcuts and gestures
- Keyboard shortcuts
- Edit your image size
- Livestream as you create in Photoshop on the iPad
- Correct imperfections with the Healing Brush
- Create brushes in Capture and use them in Photoshop on the iPad
- Work with Camera Raw files
- Create and work with Smart Objects
- Adjust exposure in your images with Dodge and Burn
- Auto adjustment commands in Photoshop on the iPad
- Smudge areas in your images with Photoshop on the iPad
- Saturate or desaturate your images using Sponge tool
- Content aware fill for iPad
- Photoshop on the web (not available in mainland China)
- Common questions
- System requirements
- Keyboard shortcuts
- Supported file types
- Introduction to the workspace
- Open and work with cloud documents
- Generative AI features
- Basic concepts of editing
- Quick Actions
- Work with layers
- Retouch images and remove imperfections
- Make quick selections
- Image improvements with Adjustment Layers
- Add a fill layer
- Move, transform, and crop images
- Draw and paint
- Draw and edit Shapes
- Work with Type layers
- Work with anyone on the web
- Manage app settings
- Generate Image
- Generate Background
- Reference Image
- Photoshop (beta) (not available in mainland China)
- Generative AI (not available in mainland China)
- Common questions on generative AI in Photoshop
- Generative Fill in Photoshop on the desktop
- Generate Image with descriptive text prompts
- Generative Expand in Photoshop on the desktop
- Replace background with Generate background
- Get new variations with Generate Similar
- Generative Fill in Photoshop on the iPad
- Generative Expand in Photoshop on the iPad
- Generative AI features in Photoshop on the web
- Content authenticity (not available in mainland China)
- Cloud documents (not available in mainland China)
- Photoshop cloud documents | Common questions
- Photoshop cloud documents | Workflow questions
- Manage and work with cloud documents in Photoshop
- Upgrade cloud storage for Photoshop
- Unable to create or save a cloud document
- Solve Photoshop cloud document errors
- Collect cloud document sync logs
- Invite others to edit your cloud documents
- Share files and comment in-app
- Workspace
- Workspace basics
- Preferences
- Learn faster with the Photoshop Discover Panel
- Create documents
- Place files
- Default keyboard shortcuts
- Customize keyboard shortcuts
- Tool galleries
- Performance preferences
- Use tools
- Presets
- Grid and guides
- Touch gestures
- Use the Touch Bar with Photoshop
- Touch capabilities and customizable workspaces
- Technology previews
- Metadata and notes
- Place Photoshop images in other applications
- Rulers
- Show or hide non-printing Extras
- Specify columns for an image
- Undo and history
- Panels and menus
- Position elements with snapping
- Position with the Ruler tool
- Web, screen, and app design
- Image and color basics
- How to resize images
- Work with raster and vector images
- Image size and resolution
- Acquire images from cameras and scanners
- Create, open, and import images
- View images
- Invalid JPEG Marker error | Opening images
- Viewing multiple images
- Customize color pickers and swatches
- High dynamic range images
- Match colors in your image
- Convert between color modes
- Color modes
- Erase parts of an image
- Blending modes
- Choose colors
- Customize indexed color tables
- Image information
- Distort filters are unavailable
- About color
- Color and monochrome adjustments using channels
- Choose colors in the Color and Swatches panels
- Sample
- Color mode or Image mode
- Color cast
- Add a conditional mode change to an action
- Add swatches from HTML CSS and SVG
- Bit depth and preferences
- Layers
- Layer basics
- Nondestructive editing
- Create and manage layers and groups
- Select, group, and link layers
- Place images into frames
- Layer opacity and blending
- Mask layers
- Apply Smart Filters
- Layer comps
- Move, stack, and lock layers
- Mask layers with vector masks
- Manage layers and groups
- Layer effects and styles
- Edit layer masks
- Extract assets
- Reveal layers with clipping masks
- Generate image assets from layers
- Work with Smart Objects
- Blending modes
- Combine multiple images into a group portrait
- Combine images with Auto-Blend Layers
- Align and distribute layers
- Copy CSS from layers
- Load selections from a layer or layer mask's boundaries
- Knockout to reveal content from other layers
- Selections
- Get started with selections
- Make selections in your composite
- Select and Mask workspace
- Select with the marquee tools
- Select with the lasso tools
- Adjust pixel selections
- Move, copy, and delete selected pixels
- Create a temporary quick mask
- Select a color range in an image
- Convert between paths and selection borders
- Channel basics
- Save selections and alpha channel masks
- Select the image areas in focus
- Duplicate, split, and merge channels
- Channel calculations
- Get started with selections
- Image adjustments
- Replace object colors
- Perspective warp
- Reduce camera shake blurring
- Healing brush examples
- Export color lookup tables
- Adjust image sharpness and blur
- Understand color adjustments
- Apply a Brightness/Contrast adjustment
- Adjust shadow and highlight detail
- Levels adjustment
- Adjust hue and saturation
- Adjust vibrance
- Adjust color saturation in image areas
- Make quick tonal adjustments
- Apply special color effects to images
- Enhance your image with color balance adjustments
- High dynamic range images
- View histograms and pixel values
- Match colors in your image
- Crop and straighten photos
- Convert a color image to black and white
- Adjustment and fill layers
- Curves adjustment
- Blending modes
- Target images for press
- Adjust color and tone with Levels and Curves eyedroppers
- Adjust HDR exposure and toning
- Dodge or burn image areas
- Make selective color adjustments
- Adobe Camera Raw
- Camera Raw system requirements
- What's new in Camera Raw
- Introduction to Camera Raw
- Create panoramas
- Supported lenses
- Vignette, grain, and dehaze effects in Camera Raw
- Default keyboard shortcuts
- Automatic perspective correction in Camera Raw
- Radial Filter in Camera Raw
- Manage Camera Raw settings
- Open, process, and save images in Camera Raw
- Repair images with the Enhanced Spot Removal tool in Camera Raw
- Rotate, crop, and adjust images
- Adjust color rendering in Camera Raw
- Process versions in Camera Raw
- Make local adjustments in Camera Raw
- Image repair and restoration
- Image enhancement and transformation
- Drawing and painting
- Paint symmetrical patterns
- Draw rectangles and modify stroke options
- About drawing
- Draw and edit shapes
- Painting tools
- Create and modify brushes
- Blending modes
- Add color to paths
- Edit paths
- Paint with the Mixer Brush
- Brush presets
- Gradients
- Gradient interpolation
- Fill and stroke selections, layers, and paths
- Draw with the Pen tools
- Create patterns
- Generate a pattern using the Pattern Maker
- Manage paths
- Manage pattern libraries and presets
- Draw or paint with a graphics tablet
- Create textured brushes
- Add dynamic elements to brushes
- Gradient
- Paint stylized strokes with the Art History Brush
- Paint with a pattern
- Sync presets on multiple devices
- Migrate presets, actions, and settings
- Text
- Filters and effects
- Saving and exporting
- Color Management
- Web, screen, and app design
- Video and animation
- Printing
- Automation
- Troubleshooting
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.
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.
A. Color channels B. Spot channels C. Alpha channels
Display the Channels panel
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Choose Windows > Channels.
Resize or hide channel thumbnails
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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.
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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.)Opomba:
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.
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Do one of the following:
In Windows, choose Edit > Preferences > Interface.
In Mac OS, choose Photoshop > Preferences > Interface.
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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.
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.
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.
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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.
Opomba: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.