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    mozIColorAnalyzer

    Provides methods to analyze colors in an image
    1.0
    28
    Introduced
    Gecko 17.0
    Inherits from: nsISupports Last changed in Gecko 17.0 (Firefox 17.0 / Thunderbird 17.0 / SeaMonkey 2.14)

    Method overview

    void findRepresentativeColor(in nsIURI imageURI, in mozIRepresentativeColorCallback callback);

    Methods

    Requires Gecko 17.0 (Firefox 17.0 / Thunderbird 17.0 / SeaMonkey 2.14)

    findRepresentativeColor()

    Given an image URI, find the most representative color for that image based on the frequency of each color. Preference is given to colors that are more interesting. It avoids the background color if it can be discerned and ignores sufficiently transparent colors.

    This is intended to be used on favicon images. Larger images take longer to process, especially those with a larger number of unique colors. If imageURI points to an image that has more than 128^2 pixels, this method will fail for performance reasons before analyzing it.

    void findRepresentativeColor(
      in nsIURI imageURI,
      in mozIRepresentativeColorCallback callback
    );

    Parameters

    imageURI
    A URI pointing to the image - ideally a data: URI, but any scheme that will load when setting the src attribute of a DOM img element should work.
    callback
    Function to call when the representative color is found or an error occurs.

    Remarks

    Below are some images with the result of findRepresentativeColor:

    Image Representative color
      0xB28D3A
      0x502E1E
      0x53BA3F
      0x00A400

    See also

    Document Tags and Contributors

    Contributors to this page: Sheppy, mnoorenberghe, ethertank, kscarfone
    Last updated by: Sheppy,