@mega-yfue/eufy-sdk / autoContrast

Function: autoContrast()

function autoContrast(
   data, 
   width, 
   height, 
   cutoff?
): void;

Per-channel auto-contrast, a byte-exact port of PIL ImageOps.autocontrast (cutoff 0.5%). The lost quant tables leave the reconstruction low-contrast ("foggy"); stretching each channel's clipped range to full scale restores a natural-looking image. Mutates data (RGBA) in place.

Parity notes vs PIL: the cutoff count is n * cutoff // 100 (integer floor); it is trimmed off each end by zeroing whole histogram bins until the count is spent; the range is then the first/last non-empty bins; and the LUT truncates toward zero (int()), NOT rounds — rounding would shift pixels.

Parameters

data

Uint8Array

width

number

height

number

cutoff?

number = 0.5

Returns

void