How to Continuously Undo in Photoshop Cc 2018

Photoshop User Guide
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. Migrate presets, actions, and settings
8. Get to know Photoshop
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. Photoshop and Adobe Stock
5. Use the Capture in-app extension in Photoshop
6. Creative Cloud Libraries
7. Creative Cloud Libraries in Photoshop
8. Use the Touch Bar with Photoshop
9. Grid and guides
10. Creating actions
11. Undo and history
Photoshop on the iPad
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
26. Work with Camera Raw files
27. Create and work with Smart Objects
28. Adjust exposure in your images with Dodge and Burn
Photoshop on the web beta
1. Common questions | Photoshop on the web beta
2. Introduction to the workspace
3. System requirements | Photoshop on the web beta
4. Keyboard shortcuts | Photoshop on the web beta
5. Supported file types | Photoshop on the web beta
6. Open and work with cloud documents
7. Collaborate with stakeholders
8. Apply limited edits to your cloud documents
Cloud documents
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. Share access and edit your cloud documents
9. Share files and comment in-app
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
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
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
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
26. Layer
27. Flattening
28. Composite
29. Background
Selections
1. Select and Mask workspace
2. Make quick selections
3. Get started with selections
4. Select with the marquee tools
5. Select with the lasso tools
6. Select a color range in an image
7. Adjust pixel selections
8. Convert between paths and selection borders
9. Channel basics
10. Move, copy, and delete selected pixels
11. Create a temporary quick mask
12. Save selections and alpha channel masks
13. Select the image areas in focus
14. Duplicate, split, and merge channels
15. Channel calculations
16. Selection
17. Bounding box
Image adjustments
1. Perspective warp
2. Reduce camera shake blurring
3. Healing brush examples
4. Export color lookup tables
5. Adjust image sharpness and blur
6. Understand color adjustments
7. Apply a Brightness/Contrast adjustment
8. Adjust shadow and highlight detail
9. Levels adjustment
10. Adjust hue and saturation
11. Adjust vibrance
12. Adjust color saturation in image areas
13. Make quick tonal adjustments
14. Apply special color effects to images
15. Enhance your image with color balance adjustments
16. High dynamic range images
17. View histograms and pixel values
18. Match colors in your image
19. How to crop and straighten photos
20. Convert a color image to black and white
21. Adjustment and fill layers
22. Curves adjustment
23. Blending modes
24. Target images for press
25. Adjust color and tone with Levels and Curves eyedroppers
26. Adjust HDR exposure and toning
27. Filter
28. Blur
29. Dodge or burn image areas
30. Make selective color adjustments
31. Replace object colors
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. How to make non-destructive edits in Camera Raw
10. Radial Filter in Camera Raw
11. Manage Camera Raw settings
12. Open, process, and save images in Camera Raw
13. Repair images with the Enhanced Spot Removal tool in Camera Raw
14. Rotate, crop, and adjust images
15. Adjust color rendering in Camera Raw
16. Feature summary | Adobe Camera Raw | 2018 releases
17. New features summary
18. Process versions in Camera Raw
19. Make local adjustments in Camera Raw
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
Image transformations
1. Transform objects
2. Adjust crop, rotation, and canvas size
3. How to crop and straighten photos
4. Create and edit panoramic images
5. Warp images, shapes, and paths
6. Vanishing Point
7. Use the Liquify filter
8. Content-aware scaling
9. Transform images, shapes, and paths
10. Warp
11. Transform
12. Panorama
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
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
14. Text Engine error using Type tool in Photoshop | Windows 8
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
Filters and effects
1. Use the Liquify filter
2. Use the Blur Gallery
3. Filter basics
4. Filter effects reference
5. Add Lighting Effects
6. Use the Adaptive Wide Angle filter
7. Use the Oil Paint filter
8. Layer effects and styles
9. Apply specific filters
10. Smudge image areas
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
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. Duotones
8. Print images to a commercial printing press
9. Improve color prints from Photoshop
10. Troubleshoot printing problems | Photoshop
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
Color Management
1. Understanding color management
2. Keeping colors consistent
3. Color settings
4. Work with color profiles
5. Color-managing documents for online viewing
6. Color-managing documents when printing
7. Color-managing imported images
8. Proofing colors
Content authenticity
1. Learn about content credentials
2. Identity and provenance for NFTs
3. Connect accounts for creative attribution
3D and technical imaging
1. Photoshop 3D | Common questions around discontinued 3D features
2. Creative Cloud 3D Animation (Preview)
3. Print 3D objects
4. 3D painting
5. 3D panel enhancements | Photoshop
6. Essential 3D concepts and tools
7. 3D rendering and saving
8. Create 3D objects and animations
9. Image stacks
10. 3D workflow
11. Measurement
12. DICOM files
13. Photoshop and MATLAB
14. Count objects in an image
15. Combine and convert 3D objects
16. 3D texture editing
17. Adjust HDR exposure and toning
18. 3D panel settings

Learn how to use the Undo/Redo commands and the History panel to control the state of your images in Adobe Photoshop.

By using the Undo/Redo commands and the History panel, you can easily control the state(s) of your images.

Use the Undo or Redo commands

Updated in Photoshop CC 20.0 (October 2018 release)

Beginning with the October 2018 release of Photoshop CC (20.0), you can undo multiple steps in your Photoshop document using Control + Z (Win) / Command + Z (Mac). This new multiple undo mode is enabled by default.

To perform undo or redo operation, do the following:

Undo: Moves one step back in the undo chain. Choose Edit > Undo or use the keyboard shortcut Control + Z (Win) / Command + Z (Mac).
Redo: Moves one step forward. Choose Edit > Redo or use the keyboard shortcut Shift + Control + Z (Win) / Shift + Command + Z (Mac).

The Edit menu also displays the name of the step that will be undone next to the Undo and Redo commands. For example, Edit > Undo Edit Type.

(Photoshop)

To switch back to the legacy undo mode in Photoshop, do the following:

From the menu bar, choose Edit > Keyboards Shortcuts.
In the Keyboard Shortcuts And Menus dialog, select Use Legacy Undo Shortcuts and click OK.
Restart Photoshop.

(Adobe Camera Raw)

To switch back to the legacy undo mode in Adobe Camera Raw, do the following:

From the menu bar in Photoshop, choose Edit > Preferences > File Handling.
In the File Compatibility section, click Camera Raw Preferences.
In the Camera Raw Preferences dialog, select Use Legacy Undo Shortcuts and click OK.
Restart Photoshop.

Revert to the last saved version

Revert is added as a history state in the History panel and can be undone.

Restore part of an image to its previously saved version

Use the History Brush tool to paint with the selected state or snapshot on the History panel.
Use the Eraser tool with the Erase To History option selected.
Select the area you want to restore, and choose Edit > Fill. For Use, choose History, and click OK.

To restore the image with a snapshot of the initial state of the document, choose History Options from the Panel menu and make sure that the Automatically Create First Snapshot option is selected.

Cancel an operation

Hold down Esc until the operation in progress has stopped. In Mac OS, you can also press Command+period.

Receive notification when an operation is completed

A progress bar indicates that an operation is being performed. You can interrupt the operation or have the program notify you when it has finished the operation.

Do one of the following: Choose Edit > Preferences > General (Windows) or Photoshop > Preferences > General (Mac OS).

Using the History panel

You can use the History panel to jump to any recent state of the image created during the current working session. Each time you apply a change to an image, the new state of that image is added to the panel.

For example, if you select, paint, and rotate part of an image, each of those states is listed separately in the panel. When you select one of the states, the image reverts to how it looked when that change was first applied. You can then work from that state.

You can also use the History panel to delete image states and, in Photoshop, to create a document from a state or snapshot.

To display the History panel, choose Window > History, or click the History panel tab.

A. Sets the source for the history brushB. Thumbnail of a snapshotC. History stateD. History state slider

Keep the following in mind when using the History panel:

Program-wide changes, such as changes to panels, color settings, actions, and preferences, are not reflected in the History panel, because they are not changes to a particular image.
By default, the History panel lists the previous 20 states. You can change the number of remembered states by setting a preference under Preferences > Performance. Older states are automatically deleted to free more memory for Photoshop. To keep a particular state throughout your work session, make a snapshot of the state (see Make a snapshot of an image).
Once you close and reopen the document, all states and snapshots from the last working session are cleared from the panel.
By default, a snapshot of the initial state of the document is displayed at the top of the panel.
States are added to the bottom of the list. That is, the oldest state is at the top of the list, the most recent one at the bottom.
Each state is listed with the name of the tool or command used to change the image.
By default, when you select a state, the states below it are dimmed. This way you can easily see which changes will be discarded if you continue working from the selected state.
By default, selecting a state and then changing the image eliminates all states that come after it.
If you select a state and then change the image, eliminating the states that came after, you can use the Undo command to undo the last change and restore the eliminated states.
By default, deleting a state deletes that state and those that came after it. If you choose the Allow Non-Linear History option, deleting a state deletes only that state.

Revert to a previous image state

Click the name of the state.
Choose Step Forward or Step Backward from the History panel menu or the Edit menu to move to the next or previous state.

Delete one or more image states

Click the name of the state, and choose Delete from the History panel menu to delete that change and those that came after it.
Drag the state to the Delete icon to delete that change and those that came after it.
Choose Clear History from the panel menu to delete the list of states from the History panel, without changing the image. This option doesn't reduce the amount of memory used by Photoshop.
Hold down Alt (Windows) or Option (Mac OS), and choose Clear History from the panel menu to purge the list of states without changing the image. If you get a message that Photoshop is low on memory, purging states is useful, because the command deletes the states from the Undo buffer and frees up memory. You can't undo the Clear History command.
Choose Edit > Purge > Histories to purge the list of states for all open documents. You can't undo this action.

Create or replace a document with an image state

Drag a state or snapshot onto the Create A New Document From Current State button in the History panel. The history list for the newly created document contains only the Duplicate State entry.
Select a state or snapshot, and click the Create A New Document From Current State button. The history list for the newly created document contains only the Duplicate State entry.
Select a state or snapshot, and choose New Document from the History panel menu. The history list for the newly created document contains only the Duplicate State entry.
Drag a state onto an existing document.

To save one or more snapshots or image states for use in a later editing session, create a new file for each state you save, and save each in a separate file. When you reopen your original file, plan to open the other saved files also. You can drag each file's initial snapshot to the original image to access the snapshots again from the original image's History panel.

Set history options

You can specify the maximum number of items to include in the History panel and set other options to customize the panel.

Choose History Options from the History panel menu.

Automatically Create First Snapshot

Automatically creates a snapshot of the initial state of the image when the document is opened.

Automatically Create New Snapshot When Saving

Generates a snapshot every time you save.

Allow Non-Linear History

Makes changes to a selected state without deleting the states that come after. Normally, when you select a state and change the image, all states that come after the selected one are deleted. In this way, the History panel can display a list of the editing steps in the order that they were made. By recording states in a nonlinear way, you can select a state, make a change to the image, and delete just that state. The change is appended at the end of the list.

Show New Snapshot Dialog By Default

Forces Photoshop to prompt you for snapshot names even when you use the buttons on the panel.

Make Layer Visibility Changes Undoable

This option is selected by default. Turning layer visibility on or off is recorded as a history step. Deselect this option to exclude layer visibility changes in history steps.

Set Edit History Log options

You may need to keep careful track of what's been done to a file in Photoshop, either for your own records, client records, or legal purposes. The Edit History Log helps you keep a textual history of changes made to an image. You can view the Edit History Log metadata using Adobe Bridge or the File Info dialog box.

You can choose to export the text to an external log file, or you can store the information in the metadata of edited files. Storing many editing operations as file metadata increases file size; such files may take longer than usual to open and save.

If you need to prove that the log file hasn't been tampered with, keep the edit log in the file's metadata, and then use Adobe Acrobat to digitally sign the log file.

By default, history log data about each session is saved as metadata embedded in the image file. You can specify where the history log data is saved and the level of detail contained in the history log.

Choose Edit > Preferences > General (Windows) or Photoshop > Preferences > General (Mac OS).

Click the History Log preference to toggle from on to off or vice versa.

For the Save Log Items To option, choose one of the following:

Metadata

Saves the history log as metadata embedded in each file.

Text File

Exports the history log to a text file. You are prompted to name the text file and choose a location in which to store it.

Both

Stores metadata in the file and creates a text file.

If you want to save the text file in a different location or save another text file, click the Choose button, specify where to save the text file, name the file if necessary, and click Save.

From the Edit Log Items menu, choose one of the following options:

Sessions Only

Keeps a record of each time you start or quit Photoshop and each time you open and close files (each image's filename is included). Does not include any information about edits made to the file.

Concise

Includes the text that appears in the History panel in addition to the Sessions information.

Detailed

Includes the text that appears in the Actions panel in addition to the Concise information. If you need a complete history of all changes made to files, choose Detailed.

Make a snapshot of an image

The Snapshot command lets you make a temporary copy (or snapshot) of any state of the image. The new snapshot is added to the list of snapshots at the top of the History panel. Selecting a snapshot lets you work from that version of the image.

Snapshots are similar to the states listed in the History panel, but they offer additional advantages:

You can name a snapshot to make it easy to identify.
Snapshots can be stored for an entire work session.
You can compare effects easily. For example, you can take a snapshot before and after applying a filter. Then select the first snapshot, and try the same filter with different settings. Switch between the snapshots to find the settings you like best.
With snapshots, you can recover your work easily. When you experiment with a complex technique or apply an action, take a snapshot first. If you're not satisfied with the results, you can select the snapshot to undo all the steps.

Snapshots are not saved with the image—closing an image deletes its snapshots. Also, unless you select the Allow Non-Linear History option, selecting a snapshot and changing the image deletes all of the states currently listed in the History panel.

Create a snapshot

Select a state and do one of the following:

To automatically create a snapshot, click the Create New Snapshot button on the History panel, or if Automatically Create New Snapshot When Saving is selected in the history options, choose New Snapshot from the History panel menu.
To set options when creating a snapshot, choose New Snapshot from the History panel menu, or Alt-click (Windows) or Option-click (Mac OS) the Create New Snapshot button.

Enter the name of the snapshot in the Name text box.

Choose the snapshot contents from the From menu:

Full Document

Makes a snapshot of all layers in the image at that state

Merged Layers

Makes a snapshot that merges all layers in the image at that state

Current Layer

Makes a snapshot of only the currently selected layer at that state

Work with snapshots

To select a snapshot, click the name of the snapshot or drag the slider at the left of the snapshot up or down to a different snapshot.
To rename a snapshot, double-click the snapshot and enter a name.
To delete a snapshot, select the snapshot and either choose Delete from the panel menu, click the Delete icon, or drag the snapshot to the Delete icon.

Paint with a state or snapshot of an image

The History Brush tool lets you paint a copy of one image state or snapshot into the current image window. This tool makes a copy, or sample, of the image and then paints with it.

For example, you might make a snapshot of a change you made with a painting tool or filter (with the Full Document option selected when you create the snapshot). After undoing the change to the image, you could use the History Brush tool to apply the change selectively to areas of the image. Unless you select a merged snapshot, the History Brush tool paints from a layer in the selected state to the same layer in another state.

The History Brush tool copies from one state or snapshot to another, but only at the same location. In Photoshop, you can also paint with the Art History Brush tool to create special effects.

Select the History Brush tool .

Do one of the following in the options bar:

Specify the opacity and blending mode.
Choose a brush and set brush options.

In the History panel, click the left column of the state or snapshot to be used as the source for the History Brush tool.

Drag to paint with the History Brush tool.

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Source: https://helpx.adobe.com/photoshop/using/undo-history.html