Vcl.Imaging.pngimage.TFilter

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Delphi

TFilter = (pfNone, pfSub, pfUp, pfAverage, pfPaeth);

C++

enum DECLSPEC_DENUM TFilter : unsigned char { pfNone, pfSub, pfUp, pfAverage, pfPaeth };

Properties

Type	Visibility	Source	Unit	Parent
enum	public	Vcl.Imaging.pngimage.pas Vcl.Imaging.pngimage.hpp	Vcl.Imaging.pngimage	Vcl.Imaging.pngimage

Description

TFilter enumerates the possible filter algorithms for a png image.

TFilter enumerates the possible filter algorithms for a png image. A filter algorithm is used before compressing a png image. The main purpose of the filter algorithm is to prepare the image for optimal compression. The following table lists the possible values and their meaning.

Value	Meaning
pfNone	No filter is applied; scan lines are stored directly.
pfSub	The Sub algorithm is used.
pfUp	The Up algorithm is used.
pfAverage	The Average algorithm is used.
pfPaeth	The Paeth algorithm is used.