Adobe Photoshop CS6 User Manual page 233

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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