PNGFilterType

Filter method is a single-byte integer that indicates the preprocessing method applied to the image data before compression.

Enumeration Members

AUTO

AUTO: -1

Defined in

plugins/js-png/dist/esm/constants.d.ts:5

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AVERAGE

AVERAGE: 3

uses the average of the two neighboring pixels (left and above) to predict the value of a pixel

Defined in

plugins/js-png/dist/esm/constants.d.ts:13

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NONE

NONE: 0

scanline is transmitted unmodified

Defined in

plugins/js-png/dist/esm/constants.d.ts:7

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PATH

PATH: 4

computes a simple linear function of the three neighboring pixels (left, above, upper left), then chooses as predictor the neighboring pixel closest to the computed value.

Defined in

plugins/js-png/dist/esm/constants.d.ts:15

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SUB

SUB: 1

filter transmits the difference between each byte and the value of the corresponding byte of the prior pixel

Defined in

plugins/js-png/dist/esm/constants.d.ts:9

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UP

UP: 2

The Up() filter is just like the Sub() filter except that the pixel immediately above the current pixel, rather than just to its left, is used as the predictor.

Defined in

plugins/js-png/dist/esm/constants.d.ts:11