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.
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1980—2000年，秘鲁持续内战，6.9万至7万人死亡或失踪。与此同时，国家陷入债务危机，外债在1980年代中期一度接近甚至超过GDP规模，政府几近破产，经济体系濒临崩溃。