Some terminals use device- or library-specific optimizations to render image
data within a rectangular 2D area. This sometimes produces undesirable output,
e.g. bad clipping or scaling, missing edges. The pixels keyword tells
gnuplot to use generic code that renders the image pixel-by-pixel instead.
This rendering mode is slower and may result in much larger output files, but
should produce a consistent rendered view on all terminals.
Example:
plot 'data' with image pixels
