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Duplicate, split, and merge channels

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  1. Photoshop User Guide
  2. Introduction to Photoshop
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    2. What's new in Photoshop
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    4. Create, open, and export documents
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    24. Correct imperfections with the Healing Brush
    25. Create brushes in Capture and use them in Photoshop
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    20. About color
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    1. Select and Mask workspace
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    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
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  13. Adobe Camera Raw
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    3. Introduction to Camera Raw
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    10. Radial Filter in Camera Raw
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    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
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    5. Basic troubleshooting steps to fix most issues
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    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
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    2. Edit video and animation layers
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    5. Paint frames in video layers
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    8. Creative Cloud 3D Animation (Preview)
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    10. Create images for video
  19. Filters and effects
    1. Use the Liquify filter
    2. Use the Blur Gallery
    3. Filter basics
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    5. Add Lighting Effects
    6. Use the Adaptive Wide Angle filter
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  20. Saving and exporting
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    3. Supported file formats
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    10. Troubleshoot printing problems | Photoshop
  22. Automation
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    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
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    7. Color-managing imported images
    8. Proofing colors
  24. Content authenticity
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  25. 3D and technical imaging
    1. Photoshop 3D | Common questions around discontinued 3D features
    2. Creative Cloud 3D Animation (Preview)
    3. Print 3D objects
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    5. 3D panel enhancements | Photoshop
    6. Essential 3D concepts and tools
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    13. Photoshop and MATLAB
    14. Count objects in an image
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    18. 3D panel settings

Duplicate channels

You can copy a channel and use it in the current image or another image.

For example, you may want to use the Duplicate Channel feature to create a channel mask; or you may want to back up a copy of a channel before you edit it.

Duplicate a channel

If you are duplicating alpha channels between images, the channels must have identical pixel dimensions. You cannot duplicate a channel to a Bitmap‑mode image.

  1. In the Channels panel, select the channel to duplicate.
  2. Choose Duplicate Channel from the Channels panel menu.
  3. Type a name for the duplicate channel.
  4. For Document, do one of the following:

    • Choose a destination. Open images only with pixel dimensions identical to the current image are available. To duplicate the channel in the same file, select the channel’s current file.

    • Choose New to copy the channel to a new image, creating a multichannel image containing a single channel. Type a name for the new image.

  5. To reverse the selected and masked areas in the duplicate channel, select Invert.

Duplicate a channel in an image

  1. In the Channels panel, select the channel you want to duplicate.
  2. Drag the channel onto the Create New Channel button  at the bottom of the panel.

Duplicate a channel in another image

  1. In the Channels panel, select the channel you want to duplicate.
  2. Make sure that the destination image is open.
    Note:

    The destination image does not have to have the same pixel dimensions as the duplicated channel.

  3. Do one of the following:

    • Drag the channel from the Channels panel into the destination image window. The duplicated channel appears at the bottom of the Channels panel.

    • Choose Select > All, and then choose Edit > Copy. Select the channel in the destination image and choose Edit > Paste. The pasted channel overwrites the existing channel.

Split channels into separate images

You can split channels of flattened images only. Splitting channels is useful when you want to retain individual channel information in a file format that doesn’t preserve channels.

  1. To split channels into separate images, choose Split Channels from the Channels panel menu.

    The original file is closed, and the individual channels appear in separate grayscale image windows. The title bars in the new windows show the original filename plus the channel. You save and edit the new images separately.

Merge channels

Multiple grayscale images can be combined as the channels of a single image. The images you want to merge must be in grayscale mode, be flattened (have no layers), have the same pixel dimensions, and be open. The number of grayscale images you have open determines the color modes available when merging channels. For example, if you have three images open, you can merge them into an RGB image; if you have four images open, they can become a CMYK image.

Note:

If you are working with DCS files that have accidentally lost their links (and so cannot be opened, placed, or printed), open the channel files, and merge them into a CMYK image. Then re-save the file as a DCS EPS file.

  1. Open the grayscale images containing the channels you want to merge, and make one of the images active.

    You must have more than one image open for the Merge Channels option to be available.

  2. Choose Merge Channels from the Channels panel menu.
  3. For Mode, choose the color mode you want to create. The number of channels appropriate for the mode appears in the Channels text box.
  4. If necessary, enter a number in the Channels text box.

    If you enter a number that is incompatible with the selected mode, Multichannel mode is automatically selected. This creates a multichannel image with two or more channels.

  5. Click OK.
  6. For each channel, make sure the image you want is open. If you change your mind about the image type, click Mode to return to the Merge Channels dialog box.
  7. If you are merging channels into a multichannel image, click Next, and select the remaining channels.
    Note:

    All channels of a multichannel image are alpha channels or spot channels.

  8. When you have finished selecting channels, click OK.

    The selected channels are merged into a new image of the specified type, and the original images are closed without any changes. The new image appears in an untitled window.

    Note:

    You cannot split and recombine (merge) an image with spot color channels. The spot color channel will be added as an alpha channel.

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