What is Half-drop repeat?
A repeat structure where alternating columns are offset vertically by exactly 50% of the tile height. Produces a diagonal flow that the eye reads as more organic than a block repeat.
In detail
Half-drop is the most common repeat in apparel print design. Alternating columns of tiles are shifted vertically by half the tile height, creating a staggered arrangement that breaks up the grid rhythm of block repeat. The adjacency constraint is identical to block on the top/bottom axis but adds a vertical shift to the left/right axis: the right edge of one tile must continue into the left edge of a tile shifted vertically by H/2. This makes half-drop slightly more complex to heal seamlessly via AI inpainting (a second pass with staggered geometry is required), but the visual benefit is significant — the eye reads half-drop patterns as more 'natural' than block, with motifs appearing to flow diagonally rather than sitting in a grid.
Example
A floral pattern where every other column starts halfway up the previous column. Tiled across a fabric panel, the flowers form diagonal lines rather than vertical or horizontal rows.