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  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. Migrate presets, actions, and settings
    8. Get to know Photoshop
  3. Photoshop and Adobe services
    1. Photoshop and Adobe Stock
    2. Creative Cloud Libraries
    3. Creative Cloud Libraries in Photoshop
    4. Use the Touch Bar with Photoshop
    5. Work with Illustrator artwork in Photoshop
    6. Use the Capture in-app extension in Photoshop
    7. Grid and guides
    8. Creating actions
    9. Undo and history
    10. Default keyboard shortcuts
    11. Touch capabilities and customizable workspaces
  4. 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
  5. 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
  6. 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
  7. Workspace
    1. Workspace basics
    2. Create documents
    3. Use the Touch Bar with Photoshop
    4. Microsoft Dial support in Photoshop
    5. Tool galleries
    6. Performance preferences
    7. Use tools
    8. Touch gestures
    9. Touch capabilities and customizable workspaces
    10. Technology previews
    11. Metadata and notes
    12. Quickly share your creations
    13. Place Photoshop images in other applications
    14. Preferences
    15. Default keyboard shortcuts
    16. Rulers
    17. Show or hide non-printing Extras
    18. Specify columns for an image
    19. Undo and history
    20. Panels and menus
    21. Place files
    22. Position elements with snapping
    23. Position with the Ruler tool
    24. Presets
    25. Customize keyboard shortcuts
    26. Grid and guides
  8. 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
  9. 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
  10. 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
  11. 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
  12. 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
  13. 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
  14. 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
  15. 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
  16. 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
  17. Text
    1. Work with OpenType SVG fonts
    2. Format characters
    3. Format paragraphs
    4. How to create type effects
    5. Edit text
    6. Line and character spacing
    7. Arabic and Hebrew type
    8. Fonts
    9. Troubleshoot fonts
    10. Asian type
    11. Create type
    12. Text Engine error using Type tool in Photoshop | Windows 8
    13. World-Ready composer for Asian Scripts
    14. How to add and edit the text in Photoshop
  18. 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
  19. 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
  20. 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
  21. 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
  22. 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
  23. 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
  24. Content authenticity
    1. Learn about content credentials
    2. Identity and provenance for NFTs
    3. Connect accounts for creative attribution
  25. 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

Issue

When you open an image in Photoshop, one of the following errors occurs:

  • Could not complete your request because it is not a valid Photoshop document.
  • Could not complete your request because an unknown or invalid JPEG marker type is found.
  • Could not complete your request because the file-format module cannot parse the file.
  • This is not a valid Portable Document File (PDF) document. It cannot be opened. 
Photoshop Error messages

Solutions

Solution 1: Make sure that the filename extension matches the actual file type.

It's important that the extension you add to the filename is the appropriate one for the actual file type of the image. When you choose a format from the Format pop-up menu in the Save As dialog box, the appropriate extension is added automatically. If you entered the extension manually, you could have typed in an extension that doesn't match the file format of your file.

Note:

If you cannot remember the actual file type the file should be, see Determine the file type of a document.

Filename extensions are hidden by default. To turn them on, perform the following steps:

Mac OS

  1. In Finder, choose Finder > Finder Preferences > Advanced.
  2. Select Show all filename extensions.
Windows 

  1. Open Windows Explorer.

    Open Windows Explorer

  2. If you don't see your menus, choose Organize > Layout > Menu Bar.

    Choose Organize > Layout > Menu Bar

  3. Choose Tools > Folder Options > View.

    Choose Tools > Folder Options > View

  4. Deselect Hide Extensions for Known File Types.

    Deselect the Hide Extensions for Known File Types checkbox

  5. Click Apply, then click OK.

Solution 2: Make sure that the file has only one filename extension.

Turn on filename extensions as in Solution 1, and view your images in Finder or Windows Explorer. Then, check to see of there are two extensions on your files. If your images have two extensions, such as:

filename.pdf.jpg

Remove the last extension so the file is named:

filename.pdf

Solution 3: Open the file in another photo app and save as JPEG

Open the problematic image in a photo app such as Preview (on macOS) or Photos (on Windows). Now save the file again as a JPEG image from within such an app. Try opening the file again in Photoshop.

Solution 4: Make sure that your hardware isn't damaged.

Validate your hardware to make sure that there are no hardware failures, such as with an external hard disk or network.

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