Bitmap

A Bitmap item is a rectangular image made up of pixels arranged in columns and rows.

Bitmap items may be inserted into a dataset using Insert from File [Create-Miscellaneous], or as datasets using Add Overlay [Home-Map].

Properties

Bitmap file
Bitmap type
Colour depth
Compression
Height
Resample method
Resolution
Transparent
Width

Item Properties

Properties

Bitmap file: _bmpfile$
The file containing the Bitmap. Bitmap items which do not use linked files leave this property empty.
Bitmap type: _classDib$
The type of image this Bitmap tem displays.
Colour depth: _depth&
The number of bits defining each pixel in a Bitmap. The more depth a Bitmap has, the more colours it can show simultaneously.
Compression: _compression#
The compression which has been applied to the Bitmap data. Uncompressed Bitmap items have a compression of 1, and JPEG Bitmapitems can have a compression as small as 0.1.
Height: _height&
The number of rows in the Bitmap item.
Resample method: _resample&
The method a Bitmap or Grid item uses when pixel values need to be resampled.
Resolution: _resolution#
The resolution of a Polygon, QZone, or Bitmap item.

For a Polygon item, the value is the resolution of the invisible cached QZone item. If there is no cached QZone item then the Polygon item's resolution is reported as zero.

A QZone item is made up of progressively smaller squares. Its resolution is the size of the smallest QZone square.

The resolution of a Bitmap item is the size of each pixel.
Transparent: _transparentColour$ /_alphaTransparency&
Is the Bitmap item transparent? If a Bitmap is transparent then any light coloured pixels will not obscure the graphics which are underneath it. Some displays and printers do not fully support transparency.
Width: _width&
The number of pixels in each row of a Bitmap.

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