ImageEn, unit iesettings




property JPEGEngine: TIEImagingEngine;


Specifies which engine is used to load and save JPEG format images.
Property Description
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)
ieenDLL Uses an ImageEn DLL to support the file format. This option gives the best performance and functionality
ieenWIC Uses the WIC API (Windows Imaging Component). Some meta-data is not supported
ieenLegacy N/A

- ieenDLL requires you to ship the IELib or IEVision DLL with your application
- With ieenAuto, only the EXE folder is searched for relevant DLL's. For ieenDLL, the system path is also checked (or explicitly call RegisterPlugins)

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


Demo  Demos\InputOutput\IEViewPerformance\Performance.dpr


// 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 isn't found or is an old version, an error will be raised
IEGlobalSettings().JPEGEngine := ieenDLL;
IEGlobalSettings().PNGEngine := ieenDLL;
IEGlobalSettings().JPEG2000Engine := ieenDLL;
IEGlobalSettings().CameraRawEngine := ieenDLL;

See Also

- ActiveJPEGEngine
- ImageEnVersion.IELibVersionStr