Vcl.Imaging.pngimage.TFilters
Delphi
type TFilters = set of TFilter;
C++
typedef System::Set<TFilter, TFilter::pfNone, TFilter::pfPaeth> TFilters;
Properties
| Type | Visibility | Source | Unit | Parent |
|---|---|---|---|---|
set typedef |
public | Vcl.Imaging.pngimage.pas Vcl.Imaging.pngimage.hpp |
Vcl.Imaging.pngimage | Vcl.Imaging.pngimage |
Description
TFilters is a set of filters that can be applied to a png image.
TFilters is a set of filter algorithms for that can be used on 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. |