Graphic scaling improvement

DITA Open Toolkit 1.3 provides improved support for graphic scaling. This feature applies to HTML Help, XHTML, PDF, and FO. The feature is not supported in RTF output.

Note: Because OASIS DITA 1.1 was not yet approved at the time DITA Open Toolkit 1.3 was released, the functionality described here should be considered preliminary until DITA 1.1 is approved, the 1.3 Toolkit assessed relative to DITA 1.1, and appropriate changes made to the Toolkit, if necessary.

The DITA 1.1 standard specifies attributes that you can use to set the actual display size of the pictures in the <image> tag, such as "width" and "height" (for example, <image height="80" width="60" href="a.jpg"/>).

You can optionally specify the metric of the length in the height and width attributes fields, for example, <image height="80pc" width="60pc" href="a.jpg"/>. The metrics currently supported are: px, pc, pt, in, cm, mm, em. The default is px.

You can also use the scaling function in setting the actual display size of the output image, for example <image height="80pc" width="60pc" href="a.jpg" scale="0.8"/>. Scale="0.8" means the picture in the output will be displayed at 80% of the size that you specified by height and width. In this example the picture will be displayed at 64 pt in height and 48 pt in width.