- Photoshop User Guide
- Introduction to Photoshop
- Photoshop and other Adobe products and services
- Work with Illustrator artwork in Photoshop
- Work with Photoshop files in InDesign
- Substance 3D Materials for Photoshop
- Photoshop and Adobe Stock
- Use the Capture in-app extension in Photoshop
- Creative Cloud Libraries
- Creative Cloud Libraries in Photoshop
- Use the Touch Bar with Photoshop
- Grid and guides
- Creating actions
- Undo and history
- Photoshop on the iPad
- 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
- Work with Camera Raw files
- Create and work with Smart Objects
- Adjust exposure in your images with Dodge and Burn
- Photoshop on the web beta
- Common questions | Photoshop on the web beta
- Introduction to the workspace
- System requirements | Photoshop on the web beta
- Keyboard shortcuts | Photoshop on the web beta
- Supported file types | Photoshop on the web beta
- Open and work with cloud documents
- Collaborate with stakeholders
- Apply limited edits to your cloud documents
- Cloud documents
- 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
- Share access and edit your cloud documents
- Share files and comment in-app
- Workspace
- Workspace basics
- Learn faster with the Photoshop Discover Panel
- Create documents
- Use the Touch Bar with Photoshop
- Tool galleries
- Performance preferences
- Use tools
- Touch gestures
- Touch capabilities and customizable workspaces
- Technology previews
- Metadata and notes
- Default keyboard shortcuts
- Touch capabilities and customizable workspaces
- Place Photoshop images in other applications
- Preferences
- Default keyboard shortcuts
- Rulers
- Show or hide non-printing Extras
- Specify columns for an image
- Undo and history
- Panels and menus
- Place files
- Position elements with snapping
- Position with the Ruler tool
- Presets
- Customize keyboard shortcuts
- Grid and guides
- 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
- Layer
- Flattening
- Composite
- Background
- Selections
- Select and Mask workspace
- Make quick selections
- Get started with selections
- Select with the marquee tools
- Select with the lasso tools
- Select a color range in an image
- Adjust pixel selections
- Convert between paths and selection borders
- Channel basics
- Move, copy, and delete selected pixels
- Create a temporary quick mask
- Save selections and alpha channel masks
- Select the image areas in focus
- Duplicate, split, and merge channels
- Channel calculations
- Selection
- Bounding box
- Image adjustments
- 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
- How to 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
- Filter
- Blur
- Dodge or burn image areas
- Make selective color adjustments
- Replace object colors
- 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
- How to make non-destructive edits 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
- Feature summary | Adobe Camera Raw | 2018 releases
- New features summary
- Process versions in Camera Raw
- Make local adjustments in Camera Raw
- Image repair and restoration
- Image transformations
- 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
- Text
- Add and edit the text
- Unified Text Engine
- Work with OpenType SVG fonts
- Format characters
- Format paragraphs
- How to create type effects
- Edit text
- Line and character spacing
- Arabic and Hebrew type
- Fonts
- Troubleshoot fonts
- Asian type
- Create type
- Text Engine error using Type tool in Photoshop | Windows 8
- Add and edit the text
- Video and animation
- Filters and effects
- Saving and exporting
- Printing
- Automation
- Color Management
- Content authenticity
- 3D and technical imaging
- Photoshop 3D | Common questions around discontinued 3D features
- Creative Cloud 3D Animation (Preview)
- Print 3D objects
- 3D painting
- 3D panel enhancements | Photoshop
- Essential 3D concepts and tools
- 3D rendering and saving
- Create 3D objects and animations
- Image stacks
- 3D workflow
- Measurement
- DICOM files
- Photoshop and MATLAB
- Count objects in an image
- Combine and convert 3D objects
- 3D texture editing
- Adjust HDR exposure and toning
- 3D panel settings
Discontinuation of 3D features in Photoshop
Photoshop’s 3D features will be removed in future updates. Users working with 3D are encouraged to explore Adobe’s new Substance 3D collection, which represents the next generation of 3D tools from Adobe. Additional details on the discontinuation of Photoshop’s 3D features can be found here: Photoshop 3D | Common questions on discontinued 3D features.
In Photoshop CS6, 3D functionality is part of Photoshop Extended. All features in Photoshop Extended are part of Photoshop. Photoshop does not have a separate Extended offering.
About image stacks
An image stack combines a group of images with a similar frame of reference, but differences of quality or content across the set. Once combined in a stack, you can process the multiple images to produce a composite view that eliminates unwanted content or noise.
You can use image stacks to enhance images in number of ways:
To reduce image noise and distortion in forensic, medical, or astrophotographic images.
To remove unwanted or accidental objects from a series of stationary photos or a series of video frames. For example, you want to remove a figure walking through an image, or remove a car passing in front of the main subject matter.
Image stacks are stored as Smart Objects. The processing options you can apply to the stack are called stack modes. Applying a stack mode to an image stack is a non-destructive edit. You can change stack modes to produce different effects; the original image information in the stack remains unchanged. To preserve changes after you apply the stack mode, save the result as a new image, or rasterize the Smart Object. You can create an image stack manually or using a script.
Create an image stack
For best results, images contained in an image stack should have the same dimensions and mostly similar content, such as a set of still images taken from a fixed viewpoint, or a series of frames from a stationary video camera. The content of your images should be similar enough to allow you to register or align them to other images in the set.
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Combine the separate images into one multi-layered image. See Duplicate layers.Note:
An image stack must contain at least two layers.
You can also combine images using a script (File > Scripts > Load Files into Stack).
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Choose Select > All Layers.Note:
To make the Background layer selectable with the All Layers command, you must first convert it to a regular layer.
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Choose Edit > Auto-Align Layers and select Auto as the alignment option. If Auto does not create good registration of your layers, try the Reposition option.
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Choose Layer > Smart Objects > Convert to Smart Object.
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Choose Layer > Smart Objects > Stack Mode and select a stack mode from the submenu.
For noise reduction, use the Mean or Median plug‑ins.
For removing objects from the image, use the Median plug‑in.
The output is a composite image the same size as the original image stack. You may need to experiment with different plug‑ins to get the best enhancement for a particular image.
To change the rendering effect, choose a different Stack Mode from the submenu. Stack rendering is not cumulative—each render effect operates on the original image data in the stack and replaces previous effects.
Stack modes
Stack modes operate on a per-channel basis only, and only on non-transparent pixels. For example, the Maximum mode returns the maximum red, green, and blue channel values for a pixel cross section and merges them into one composite pixel value in the rendered image.
Rendering plug-in name |
Result |
Comments |
---|---|---|
Entropy |
entropy = - sum( (probability of value) * log2( probability of value) ) Probability of value = (number of occurrences of value) / (total number of non-transparent pixels) |
The binary entropy (or zero order entropy) defines a lower bound on how many bits would be necessary to losslessly encode the information in a set. |
Kurtosis |
kurtosis = ( sum( (value - mean)4 ) over non-transparent pixels ) / ( ( number of non-transparent pixels - 1 ) * (standard deviation)4 ). |
A measure of peakedness or flatness compared to a normal distribution. The kurtosis for a standard normal distribution is 3.0. Kurtosis greater than 3 indicates a peaked distribution, and kurtosis less than 3 indicates a flat distribution (compared to a normal distribution). |
Maximum |
The maximum channel values for all non-transparent pixels |
|
Mean |
The mean channel values for all non-transparent pixels |
Effective for noise reduction |
Median |
The median channel values for all non-transparent pixels |
Effective for noise reduction and removal of unwanted content from the image |
Minimum |
The minimum channel values for all non-transparent pixels |
|
Range |
Maximum minus the minimum of the non-transparent pixel values |
|
Skewness |
skewness = (sum( (value - mean)3 ) over non-transparent pixels ) / ( ( number of non-transparent pixels - 1 ) * (standard deviation)3 ) |
Skewness is a measure of symmetry or asymmetry around the statistical mean |
Standard Deviation |
standard deviation = Square Root(variance) |
|
Summation |
The sum channel values for all non-transparent pixels |
|
Variance |
variance = (sum( (value-mean)2 ) over non-transparent pixels ) / ( number of non-transparent pixels - 1) |
Remove stack rendering
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Choose Layers > Smart Objects > Stack Mode > None to remove any rendering from an image stack and convert it back to a regular Smart Object.
Edit an image stack
Because an image stack is a Smart Object, you can edit the original images that make up the stack layers at any time.
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Choose Layer > Smart Objects > Edit Contents, or double-click the layer thumbnail. After you save the edited Smart Object, the stack is automatically rendered with the last rendering option applied to the stack.
Convert an image stack
To preserve rendering effects on an image stack, convert the Smart Object to a regular layer. (You can copy the Smart Object before converting, in case you want to later re‑render the image stack.)
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Choose Layer > Smart Objects > Rasterize.
Use a script to create an image stack
You can use the Statistics script to automate creating and rendering an image stack.
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Choose File > Scripts > Statistics.
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Choose a stack mode from the Choose Stack Mode menu.
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Apply the stack mode to currently open files, or browse to select a folder or individual files.
Files you select are listed in the dialog box.
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If desired, select Attempt To Automatically Align Source Images (equivalent to choosing Edit > Auto-Align Layers). Then click OK.
Photoshop combines the multiple images into a single multilayered image, converts the layers into a Smart Object, and applies the selected stack mode.
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