TIEGlobalSettings.JPEGEngine

Declaration

property JPEGEngine: TIEImagingEngine;

Description

Specifies which engine is used to load and save JPEG format images.

Property	Description	32bit Requirement	64bit Requirement
ieenAuto	Automatically chooses ieenDLL if a DLL is found in the EXE folder, otherwise ieenNative (32bit) or ieenWIC (64bit)	-	-
ieenNative	Uses native loading code (32bit only)	ieNativeJPEG in uses	N/A
ieenDLL	Uses an ImageEn DLL to support the file format. This option gives the best performance and functionality	ielib32.dll or ievision.dll	ielib64.dll or ievision64.dll
ieenWIC	Uses the WIC API (Windows Imaging Component). Some meta-data is not supported. You cannot save to the following pixel formats: ie8p, ie32f, ieCIELab	Always Supported	Always Supported
ieenNone	Format is unavailable	-	-

Note:
◼Generally, use of the DLL is the best option
◼ieenDLL requires you to ship the IELib or IEVision DLL with your application
◼If you use ieenNative you should add ieNativeJPEG to your uses clause (for future compatibility)
◼With ieenAuto, only the EXE folder is searched for relevant DLLs. For ieenDLL, the system path is also checked (or specify a path by calling RegisterPlugins)
◼You can get the active engine using ActiveJPEGEngine, and the status of all imaging engines using ImageEnVersion.Status

Default: ieenAuto (which uses ieenDLL if a DLL is available, otherwise ieenNative in 32bit apps or ieenWIC in 64bit apps)

WIC Support

WIC (Windows Imaging Component) allows ImageEn to load many image formats directly from Windows. This provides a very good performance and prevents you needing to ship a DLL. However some features are not supported with WIC and will be lost from the image if you save using WIC.

The following features are unsupported at this time:
◼IPTC Fields
◼XMP Fields
◼Wang Annotations
◼ImageEn Annotations
◼ICC Profiles
◼Photoshop Image Resources (TIFF_PhotoshopImageResources, TIFF_PhotoshopImageSourceData)
◼Some EXIF properties: EXIF_WhitePoint, EXIF_PrimaryChromaticities, EXIF_YCbCrCoefficients, EXIF_ReferenceBlackWhite, EXIF_MakerNote

Engine Performance

Demos

	Demos\InputOutput\ImagingEngines\ImagingEngines.dpr
	Demos\InputOutput\IEViewPerformance\Performance.dpr

Examples

// Use WIC to load JPEG images
IEGlobalSettings().JPEGEngine := ieenWIC;

// Force use of IELib DLL for improved performance
// ImageEn will attempt to load the DLL even if it's not in the EXE folder. If the DLL is not found or is outdated, an error will be raised
IEGlobalSettings().JPEGEngine := ieenDLL;
IEGlobalSettings().PNGEngine := ieenDLL;
IEGlobalSettings().JPEG2000Engine := ieenDLL;
IEGlobalSettings().CameraRawEngine := ieenDLL;

TIEGlobalSettings.JPEGEngine