29 lines
1.2 KiB
TypeScript
29 lines
1.2 KiB
TypeScript
/**
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* Filter method is a single-byte integer that indicates the preprocessing method applied to the image data before compression.
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*/
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export declare enum PNGFilterType {
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AUTO = -1,
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/** scanline is transmitted unmodified */
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NONE = 0,
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/** filter transmits the difference between each byte and the value of the corresponding byte of the prior pixel */
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SUB = 1,
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/** 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. */
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UP = 2,
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/** uses the average of the two neighboring pixels (left and above) to predict the value of a pixel */
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AVERAGE = 3,
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/** 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. */
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PATH = 4
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}
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/**
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* Color type is a single-byte integer that describes the interpretation of the image data.
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* Color type codes represent sums of the following values:
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*
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* 1 (palette used), 2 (color used), and 4 (alpha channel used).
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*/
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export declare enum PNGColorType {
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GRAYSCALE = 0,
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COLOR = 2,
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GRAYSCALE_ALPHA = 4,
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COLOR_ALPHA = 6
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}
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//# sourceMappingURL=constants.d.ts.map
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