The TaskJuggler User Manual

Keyword

cellcolor (column)

Purpose	Specifies an alternative background color for the cells of this column. The logical expression specifies for which cells the color should be used. If multiple cellcolor patterns are provided for a column, the first matching one is used for each cell.
Syntax	cellcolor (<operand> [(| | & | > | < | = | >= | <= | !=) <operand>...] | @ (all | none)) <color>
Arguments	operand	An operand can consist of a date, a text string, a function, a property attribute or a numerical value. It can also be the name of a declared flag. Use the scenario_id.attribute notation to use an attribute of the currently evaluated property. The scenario ID always has to be specified, also for non-scenario specific attributes. This is necessary to distinguish them from flags. See columnid for a list of available attributes. The use of list attributes is not recommended. User defined attributes are available as well. An operand can be a negated operand by prefixing a ~ charater or it can be another logical expression enclosed in braces.
	|	The 'or' operator
	&	The 'and' operator
	>	The 'greater than' operator
	<	The 'smaller than' operator
	=	The 'equal' operator
	>=	The 'greater-or-equal' operator
	<=	The 'smaller-or-equal' operator
	!=	The 'not-equal' operator
	color [STRING]	The RGB color values of the color. The following formats are supported: #RGB and #RRGGBB. Where R, G, B are hexadecimal values. See Wikipedia for more details.
Context	columns