(Numerous PDF viewers do accept the invalid operation order but it's invalid nonetheless). This is invalid, compare Figure 9 – Graphics Objects in the specification, after path construction (and an optional clipping path operator) the path painting operation must follow immediately. l h) and the path filling operation ( f). The color setting operation here is between the path definition ( 162. If drawn upon a green lattice, the result looks like this:īy the way, there was an error in the OP's original content stream fragment 162 86 m 162 286 l 362 286 l 362 86 l h Now you can use these named graphics state parameters in your content stream: /GS1 gs Thus, you first have to define an appropriate graphics state parameter dictionary in the page resources, e.g.: /Resources> As described previously for the soft mask, the alpha source flag in the graphics state shall determine whether the alpha constants are interpreted as shape values ( true) or opacity values ( false). The stroking and nonstroking alpha constants shall be set, respectively, by the CA and ca entries in a graphics state parameter dictionary (see “Graphics State Parameter Dictionaries”). The nonstroking alpha constant shall also be applied when painting a transparency group’s results onto its backdrop. NOTE 1 This parameter is analogous to the current colour used when painting elementary objects. The current alpha constant parameter in the graphics state (see “Graphics State”) shall be two scalar values-one for strokes and one for all other painting operations-to be used for the constant shape ( f_k) orĬonstant opacity ( q_k) component in the colour compositing formulas. The most appropriate way for the OP's context is explained in the following section: This is due to a multitude of ways to apply transparency. As the OP indicated, there is a whole section in the PDF specification on the topic of Transparency.
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