Compress

Compress compresses an uncompressed raster image into an appropriate TIFF format so the bitmap item uses less memory and the overlay or SIS Workspace Definition (SWD) containing the bitmap uses less disk space.

Cadcorp SIS Desktop chooses the compression scheme to use depending on the colour depth of the Bitmap item.

Select Edit > Bitmap > Compress.

Compress is also available from the bitmap item local menu.

The resulting TIFF format bitmap item is saved inside the overlay. (If the original bitmap was a linked bitmap, the link is now broken)

Once compressed, the image may take longer to draw.

If the Bitmap was linked to an external file, the link will be broken. This means the original file stays unchanged.

Click the icon or right-click inside the map window and select Compress.

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