.GRD File Extension

File saved in Golden Software's grid format, which is used to generate maps; contains two-dimensional uniform lattices (regularly spaced, rectangular array) of XYZ data (e.g. easting, northing, and elevation); may be in a binary or text format, but is most often saved in the binary format.

File created by Photoshop, an image editing program; contains a gradient, or multi-color fill, in which colors incrementally change into other colors; commonly applied to drawing objects or tiled in background patterns; used to store and share gradients.

Gradients are designed to repeat colors even when the gradient space increases in size. Therefore, gradients can smoothly fill drawn objects or backgrounds without abrupt visual edges. They may use linear, radial, reflected, or angle formats.