PdfPredictorFunction Enum

Namespace:
GemBox.Pdf.Filters
Assembly:
GemBox.Pdf.dll

Represents a predictor function that can be applied to PdfLZWDecodeFilter or PdfFlateDecodeFilter data to make the encoded data more compact.

public enum PdfPredictorFunction
Public Enum PdfPredictorFunction
Remarks

PdfLZWDecodeFilter and PdfFlateDecodeFilter encoding compress more compactly if their input data is highly predictable. One way of increasing the predictability of many continuous-tone sampled images is to replace each sample with the difference between that sample and a PdfPredictorFunction applied to earlier neighboring samples. If the PdfPredictorFunction works well, the post prediction data clusters toward 0.

Fields

None

No prediction (the default value).

PNGAverageOnAllRows

PNG prediction (on encoding, PNG Average on all rows).

PNGNoneOnAllRows

PNG prediction (on encoding, PNG None on all rows).

PNGOptimum

PNG prediction (on encoding, PNG optimum).

PNGPaethOnAllRows

PNG prediction (on encoding, PNG Paeth on all rows).

PNGSubOnAllRows

PNG prediction (on encoding, PNG Sub on all rows).

PNGUpOnAllRows

PNG prediction (on encoding, PNG Up on all rows).

TIFF2

TIFF Predictor 2.

Unknown

Prediction algorithm is unknown.

See Also