The GIMP provides only Cartesian grids. You can choose the color of the grid lines, and the spacing and offsets from the origin of the image, independently for the horizontal and vertical grid lines. You can choose one of five different grid styles.
command lets you set the properties of the grid which you can display over your image while you are working on it. TheAppearance
In the
dialog, you can set the properties of the grid which is shown when you turn on the image grid.This style, the least conspicuous, shows a simple dot at each intersection of the grid lines.
This style, the default, shows a plus-shaped crosshair at each intersection of the grid lines.
This style shows dashed lines in the foreground color of the grid. If the lines are too close together, the grid won't look good.
This style shows dashed lines, where the foreground and background colors of the grid alternate.
This style shows solid grid lines in the foreground color of the grid.
Click on the color dwell to select a new color for the grid.
Spacing
You can select the cell size of the grid and the unit of measurement.
Offset
You can set the offset of the first cell. The coordinate origin is the upper left corner of the image. By default, the grid begins at the coordinate origin, (0,0).