pixel
Picture element. The bits at location (x, y) of all the bitplanes in the framebuffer constitute the single pixel (x, y). In an image in client memory, a pixel is one group of elements. In OpenGL window coordinates, each pixel corresponds to a 1.0x1.0 screen area. The coordinates of the lower-left corner of the pixel names x, y are (x, y), and the upper-right corner are (x+1, y+1).