JPEG RGB (*.jpg)

24-bit, 16.7 million colour JPEG.

Export as a jpeg raster (*.jpg).

JPEG is a lossy compression system which can achieve very high compression factors without picture quality suffering too much - discarding information that the human eye cannot see – slight changes in colour for instance. Works well on colour photographs, works less well on line drawings, where the compression algorithm tends to blur sharp edges and thin lines.

When exporting to JPEG (RGB) (*.jpg) the following Raster Exporter Configuration dialog is displayed:

 

Configuration

Pixel Size

Specifies the image resolution.

Image Width/Height

Specifies the output file size in pixels for width and height and the pixel size is in map units.

Compression Quality

Select in the range 100 - 10. 100=good (lossless), 10=bad.

Create Worldfile

Create worldfile containing georeferencing information. True or False.

Progressive scanning

Progressive scanning allows gradual improvement of quality as an image is being viewed on the fly during transmission. True or False.

Arguments to Export API Method

• clsExport$
  
  JPEG_GDALExporter

Compatibility:

• Cadcorp SIS Desktop
• Cadcorp SIS ActiveX Modeller
• Cadcorp SIS ActiveX Manager

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