Arbortext IsoDraw > Data Exchange Reference > Image File Formats > PNG > Preferences for Export
  
Preferences for Export
Choose Edit > Preferences, then click the PNG symbol. The following preferences panel appears:
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You can find more detailed information about the options for image elements in the Edit image section of the Reference Manual.
You can set the following preferences for export:
Resolution
The resolution defines how many pixels are present per inch (dpi = dots per inch). The higher the resolution, the better the quality. This however, also rapidly increases the size of the file at the same time.
Border
This option allows you to specify a border width for the PNG image. This enables you to isolate your illustration from the background. A value of e.g. 5 means that a white border of 5 mm will be left around the actual image on all sides. The image therefore becomes 10 mm wider and higher.
Dimensions
This field allows you to specify the dimensions of the PNG file. This is governed either by the size of the drawing sheet in Arbortext IsoDraw or the actual extent of the elements.
Image Depth
The image depth (bit depth) option essentially allows you to control how many different colors a PNG file can contain. A line-art illustration can only contain black or white pixels, a grayscale image can contain up to 256 different grayscales. Color images are limited to 256 colors (8 bits) or any of the settings up to and including 16.7 million colors.
Filter
This menu allows you to select a filter that is used to prepare the data for the compression. The choice depends on the capabilities of the target program.