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A low threshold preserves detail (more leaf nodes, less compression). A high threshold merges aggressively (fewer leaves, more compression, but the image gets blocky). The grid overlay shows the quadtree structure: large cells in uniform areas, small cells where detail is preserved.
Apple is kicking off multiple days of product announcements this morning with a new iPad Air. Unsurprisingly, it’s more or less like the iPad Air Apple announced one year ago, except it now has an M4 chip instead of last year’s M3.