Decorative panel and method of producing such a panel

A decorative panel, in particular a floor panel, ceiling panel or wall panel, comprising:

• a calendered, and preferably extruded, core composed of at least one core layer, wherein said core is provided with an upper side and a lower side,
• a decorative top structure, either directly or indirectly, affixed on said upper side of the core,
• a first panel edge preferably comprising a first coupling profile, and a second panel edge preferably comprising a second coupling profile being designed to engage interlockingly with said first coupling profile of an adjacent panel, both in horizontal direction and in vertical direction,
• wherein the upper side and/or the lower side of at least one core layer and/or the core is provided with at least one impressed pattern which-comprises one or more impressed core grooves, realised by means of extrusion and/or calendering, wherein a centre portion of said impressed pattern comprises impressed core grooves having a depth which exceeds a depth of impressed core grooves of at least one peripheral portion of the impressed pattern.