Feynman diagram for gluon exchange, time up, gluon horizontal.

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The discussion centers on the labeling of gluons in Feynman diagrams, specifically regarding a horizontal gluon labeled as a green-antiblue gluon. It is established that the direction of color flow in the diagram is determined by the quarks involved, allowing for the gluon to also be labeled as blue-antigreen. The orientation of the gluon does not restrict its labeling, as the color flow is inferred from the quark positions in the diagram.

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Consider the Feynman diagram below from,

http://hyperphysics.phy-astr.gsu.edu/hbase/particles/expar.html

where I assume time runs upwards and the gluon in the graphic runs horizontal and is labled as a green_antiblue gluon. If the gluon runs horizontal can one still label a gluon as being green_antiblue? Only if the gluon is not horizontal can we specifically label it? Hope my question is not too confusing.

Thanks for any help!
 

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You could label it blue anti-green as well, the "direction" of color flow can (and has to) be seen from the quarks if the diagram is drawn like this.
 

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