TIOParams.RAW_GetExifThumbnail

Declaration

property RAW_GetExifThumbnail: Boolean;

Description

Enable loading of the embedded thumbnail, rather than the full image. A thumbnail is often available for Raw images (EXIF Thumbnail).
If the file does not contain a thumbnail, the full image will be automatically loaded instead.

Note: RAW_GetExifThumbnail is also set by GetThumbnail

Demos

Raw Loading Speed

ImageEn offers four properties to improve loading speed for RAW images:
◼RAW_GetExifThumbnail
◼RAW_GetEmbeddedJpeg
◼RAW_EmbeddedJpegLoading
◼RAW_HalfSize

Usage

// Load the full size RAW
ImageEnView.IO.Params.RAW_GetExifThumbnail := False;
ImageEnView.IO.Params.RAW_GetEmbeddedJpeg := False;
ImageEnView.IO.Params.RAW_HalfSize := False;

// Load the half size RAW
ImageEnView.IO.Params.RAW_GetExifThumbnail := False;
ImageEnView.IO.Params.RAW_GetEmbeddedJpeg := False;
ImageEnView.IO.Params.RAW_HalfSize := True;

// Load the embedded JPEG (loading a half size raw if there is no embedded JPEG)
ImageEnView.IO.Params.RAW_GetExifThumbnail := False;
ImageEnView.IO.Params.RAW_GetEmbeddedJpeg := True;
ImageEnView.IO.Params.RAW_HalfSize := True;

// Load the thumbnail (will automatically fall back to the embedded JPEG if there is no thumbnail)
ImageEnView.IO.Params.RAW_GetExifThumbnail := True
ImageEnView.IO.Params.RAW_GetEmbeddedJpeg := True;
ImageEnView.IO.Params.RAW_HalfSize := True; // In case there is no EXIF thumbnail or embedded JPEG

Performance Testing

// Testing loading of 100 raw images of various types:
IEGlobalSettings().CameraRawEngine := ieenDLL;
ImageEnView1.IO.Params.RAW_GetExifThumbnail      := loadExif;
ImageEnView1.IO.Params.RAW_GetEmbeddedJpeg       := loadJpeg or loadExif;
ImageEnView1.IO.Params.RAW_EmbeddedJpegLoading   := jpegMethod;
ImageEnView1.IO.Params.RAW_EmbeddedJpegMinWidth  := 200;
ImageEnView1.IO.Params.RAW_EmbeddedJpegMinHeight := 200;
ImageEnView1.IO.Params.RAW_HalfSize              := loadHalf or loadJpeg or loadExif;
t := GetTickCount;
for i := 0 to ss.Count - 1 do
  ImageEnView1.IO.LoadFromFile( ss[i] );
memo1.Lines.Add('Load: ' + FloatToStr( GetTickCount - t / 1000 ));

Example

// Load only the thumbnail
ImageEnView1.IO.Params.RAW_GetExifThumbnail := True;
ImageEnView1.IO.LoadFromFile('C:\input.crw');

See Also

◼GetThumbnail
◼OptimizeLoadingParams
◼RAW_EmbeddedJpegLoading

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