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TJPEGImage - a class for handling images stored in JPEG (compressed) format.
Source position: graphics.pp line 1796
type TJPEGImage = class(TFPImageBitmap) |
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protected |
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procedure InitializeReader(); override; |
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Initializes the FCL-compatible image reader for the image type. |
procedure InitializeWriter(); override; |
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Initializes the FCL-compatible Image Writer for the image type. |
procedure FinalizeReader(); override; |
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Finalizes the FCL Image reader. |
class function GetReaderClass; override; |
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Gets the class reference used to create new instances of the FCL-compatible image reader. |
class function GetWriterClass; override; |
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Gets the class reference used to create new instances of the FCL-compatible image writer. |
class function GetSharedImageClass; override; |
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Gets the class reference used to create new shared image instances in the class. |
public |
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constructor Create; override; |
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Constructor for the class instance. |
procedure Compress; |
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Applies compression settings in the class instance to the image data. |
class function IsStreamFormatSupported(); override; |
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Indicates if the stream contains a format supported for the image type. |
class function GetFileExtensions; override; |
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Gets the file extension(s) supported for the image format. |
property CompressionQuality: TJPEGQualityRange; [rw] |
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Determine the compression quality for the image data. |
property GrayScale: Boolean; [r] |
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Indicates if the image contains grayscale image data. |
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Minimum height allowed for the image when read using an FCL image reader. |
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Minimum width allowed for the image when read using an FCL image reader. |
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property ProgressiveEncoding: Boolean; [rw] |
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Indicates if progressive encoding is used for the image data. |
property Performance: TJPEGPerformance; [rw] |
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Set for best quality or best speed. |
property Scale: TJPEGScale; [rw] |
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A predefined scaling value applied to the image data. |
property Smoothing: Boolean; [rw] |
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Indicates if smoothing is applied to the raw image data. |
end; |
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TJPEGImage - a class for handling images stored in JPEG (compressed) format. |
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Implements a Bitmap using the FPImage reader and writer from the FCL. |
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TCustomBitmap - the base class for TBitmap. |
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TRasterImage - base class for a number of graphic controls, including TCustomBitmap and TCustomIcon, which use a raster of dots to display graphic information. |
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Abstract base class used for images in supported image formats. |
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TJPEGImage is a TFPImageBitmap descendant which implements support for the JPEG (Joint Photographic Experts Group) image format. JPEG images are commonly used for storing digital photographs. They can represent detailed color photos using a high degree of compression, resulting in very efficient storage, though with some loss of quality.
JPEG image files normally have a file extension like: jpeg, jpg, jpe, or jfif.
The CompressionQuality and Performance properties can be used to set the balance between storage efficiency and picture quality. CompressionQuality is an Integer value between 1 and 100, with 100 representing the best quality. Performance is an enumerated variable with two states: BestQuality or BestSpeed (for compression).
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Implements a Bitmap using the FPImage reader and writer from the FCL. |
| Version 3.2 | Generated 2024-02-25 | Home |