codec / predictor · 2D / lossless

med

Follow smooth areas without crossing sharp edges.

med is the edge-aware predictor used by JPEG-LS. On smooth areas it behaves like planar. At a strong horizontal or vertical boundary, it clamps the prediction to the nearer neighbour instead of guessing across the edge. This often produces cleaner differences on rasters with abrupt boundaries, although samples must decode in order.

ctid

0x72D705

header

uint32 · row width in samples
+ uint32 · plane count, when above one

widths

8 · 16 · 32 · 64-bit integers

decode

median(W, N, W+N−NW) per sample, in order