Controlling Display Area Size and Image Resolution :: SAS/GRAPH(R) 9.3: Reference, Third Edition

The resolution of an image is the number of pixels per inch. Resolution is determined by the values of the device parameters XMAX, YMAX, XPIXELS, and YPIXELS, and is calculated by dividing the number of pixels by the corresponding outer dimension. For example:

Therefore, the X resolution of the PSCOLOR device illustrated in Default Dimensions of the PSCOLOR Device is 300dpi (dots per inch).

Ordinarily, you do not want to change the image resolution because changing it might distort your image. However, you might want to change the size of the display area. To do so without changing the resolution, use the GOPTIONS statement to change either the values of XPIXELS= and YPIXELS=, or the values of XMAX= and YMAX=. SAS/GRAPH automatically calculates the correct value for the unspecified parameters so that the device retains the default resolution.

For information about controlling the resolution of your image see Using the XPIXELS=, XMAX=, YPIXELS=, and YMAX= Graphics Options to Set the Resolution for the Native Devices.