Spanish to English Art/Literary Art, Arts & Crafts, Painting

Iberian Spanish text on engravings of the 16th century. Fairly academic. Author talks about the first woodcuts of a natural landscape in Spain and mentions the techniques used, which in this case includes a term I'm not familiar with, which is "vaciado en madera".

Part of the sentence can be seen below:

...que realizaron las planchas de esta obra siguiendo la técnica de la xilografía, vaciado en madera y posterior estampado en relieve.

Any help gratefully received.