contrast filter

She didn't want the feel of bright sunlight here, she decided as she added a low contrast filter.

Lattice AN6017 application note comparing and contrasting filters (in order of damping coefficient, from lower to higher values): Gaussian, Bessel, linear phase, Butterworth, Chebyshev, Legendre, elliptic.

This procedure involves removing the yellow and cyan dichroic filters (the magenta filter is retained for a contrast filter) and replacing the heaters which warm the RA-4 color developer with a chiller.

Even without the suit's contrast filters slid down, she made out the bands of equatorial coloration that striped the world from pole to pole: shades of ochre and orange, sepia and buff, vermilion and amber.