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When comparing documents in the Viewer, it can sometimes be useful to allow channels to be compared, even if the channel definitions have changed. For example, a channel that has been renamed from Blue to Pantone 660 as part of the pre-press process. There are two ways of determining which channels are compared to each other. One is to change the channel Color Definition for the current document to match that of the reference document by clicking the color swatch in the Channels widget and modifying the values in the Channel Colors popup. The easiest way however, is to use the Channel Matching dialog.

This article describes how use the Channel Matching dialog in the WebCenter HTML5 Viewer.


The Channel Matching dialog is used in document comparison to link channels that have been changed from one document to another, but where it is still valuable to compare the channels directly. These changes can be anything from insignificant differences in channel display color to name changes from designer ink names to production ink names.

Follow these steps to use the Channel Matching dialog in the WebCenter HTML5 Viewer:

  1. If you select two documents with different channel definitions and choose the option Compare in Viewer, a dialog appears stating:

    The two compared documents both contain channels not present in the other. Do you want to change channel matching settings?

  2. Click Open channel matching to open the Channel Matching dialog.

  3. In case you did not see the first dialog, or you clicked Cancel, you can still launch the Channel Matching dialog by clicking the Channel Matching button in the Channels widget or the Document Select widget.

  4. In the Channel Matching dialog, you see the channels of the current document on the left and the channels of the reference document on the right. In the middle table, under Matched Channels, you can see which channels are already (automatically) matched. Automatically matched channels are displayed in bold and placed opposite to the channels they match. Changed channels are indicated with an asterisk (*) character. Channels Current and Channels Reference show the channels that are unmatched currently, if any.

  5. The Channel matching settings show three different options:
    1. Match only if identical: With this setting selected, only channels that have identical names and display colors are matched automatically.
    2. Ignore display RGB differences: This setting will match channels automatically if their names match and ignore differences in display colors.
    3. Also use smart name matching: In addition to ignoring display color differences, this setting will match channels that have related names such as:
      1. Names that only differ in use of upper and lower case. Example: Magenta - magenta.
      2. Names that only differ in color book specification. Examples: 660 - Pantone 660 C, and Cyan - Process Cyan

      3. Names that are known-abbreviations of each other. Example: C - Cyan.

  6. If the automatic matching settings do not match all the channels than can be compared directly, you can edit channel definitions of one image to match those of the other. To match currently unmatched channels, drag the swatches from the utmost left and right columns to the middle table.

  7. Manually matched channels should be on the same line in the Matched Channels table. One of the two is highlighted. This indicates which channel definition will be used for comparison. To switch, click the other channel.
  8. Once you are done matching channels, click Save channel matching to close the dialog and see the changes.

By default, changing the automatic matching settings applies only to the current document. But you can change the default behavior by enabling the Make this setting the default check box.

Article information
Applies to

WebCenter 14.0 and newer

Last revised 
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