Grayscale default input color profile. Specifies the name of the ICC color profile to be used for grayscale source images which do not embed a color profile and for certain grayscale color values specified with various Image Serving commands, such as color=.
Text string. If specified, must be a valid
icc::Name value from the ICC profile map of either this image catalog or the default catalog, or a file path relative to
attribute::RootPath. The referenced ICC profile must be a grayscale profile.
default::IccProfileSrcGray if not defined or if empty. If
attribute::IccProfileSrcGray does not resolve to a valid profile,
attribute::IccProfileGray is used instead.