Vcl.Imaging.jpeg.JPEGDefaults
Delphi
JPEGDefaults: TJPEGDefaults = (
CompressionQuality: 90;
Grayscale: False;
Performance: jpBestQuality;
PixelFormat: jf24Bit; // initialized to match video mode
ProgressiveDisplay: False;
ProgressiveEncoding: False;
Scale: jsFullSize;
Smoothing: True;
);
C++
extern DELPHI_PACKAGE TJPEGDefaults JPEGDefaults;
Properties
| Type | Visibility | Source | Unit | Parent |
|---|---|---|---|---|
| variable | public | Vcl.Imaging.jpeg.pas Vcl.Imaging.jpeg.hpp |
Vcl.Imaging.jpeg | Vcl.Imaging.jpeg |
Description
TJPEGDefaults defines a set of default options used when manipulating jpeg images.
JPEGDefaults is a global variable used to control certain options used to manipulate jpeg images. You can change the value of the JPEGDefaults fields at run time in order to control how jpeg images are manipulated. The following table lists all the fields contained within JPEGDefaults and their description.
| Field | Description |
|---|---|
|
CompressionQuality |
Indicates the trade-off ratio between the image quality and the file size. |
|
Grayscale |
Determines whether the image output of a jpeg image is black and white or color. |
|
Performance |
Controls the trade-off between color quality and speed of decompression. |
|
PixelFormat |
The default pixel format used when displaying a jpeg image. |
|
ProgressiveDisplay |
Controls whether a jpeg image is progressively displayed while decompressing. |
|
ProgressiveEncoding |
Controls whether a jpeg image can be progressively displayed when it is decompressed. |
|
Scale |
Determines the size of a jpeg image when it is displayed. |
|
Smoothing |
Determines whether a jpeg image displays in blocks or with blurred edges. |
