1. A method comprising: receiving a glyph for display at a size on a raster output device; receiving a grid ratio, the grid ratio specifying an integer number of fine pixels of a high resolution grid that correspond to a device pixel of a raster of the output device; rendering the glyph at the size on the high resolution grid, the high resolution grid including fine pixels marked to represent the glyph and fine pixels that are unmarked; determining for each line of pixels of the high resolution grid, a line-specific, per-transition adjustment number; and in each line of pixels of the high resolution grid, marking or erasing the line-specific, per-transition adjustment number of fine pixels in the high resolution grid at each transition from a marked fine pixel to an unmarked fine pixel in a particular direction of the line of pixels.