When students look at the figure through a red filter
, the area without any red component will be perceived as black, while the rest will be perceived as red
Most major filter makers, including Lee, Cokin, B+W and Hoya, produce a plain red filter
, ideal for black and white infrared photography.
Rather than having a red filter
which affects all parts of the image, the system finds those areas which are red and makes them white.
Exposing the original photo through a red filter
creates a negative from which a printing plate is made, in a process not unlike making a regular photo from a negative.
Marlboro went from a red filter
tip targeted to women, with a minor share of market, to the position of leader of the pack.
He used a deep red filter
for his next shot, which caused the sky to darken to a dark gray, and to emphasise the white snow on the Half Dome.
Contents- Sheres- Convex And Concave, Cylinders- Convex And Concave, Prisms- 10 - 1/2, Accessories- Red Filter
, Green Filter, Plano, Blank.
Typical RGB filters cover around 100-150nm in bandwidth and a red filter
of 100nm bandwidth will be less affected by dispersion than a blue filter of the same bandwidth.
Light that passed through a red filter
as well as light from a filter that shows the glowing hydrogen gas, were coloured red.
The filter's effect on the object's luminance depends on the transmission spectrum of the filter and the spectral power distribution of the object, eg a red filter
will make green objects appear dim but it will only have a small effect on red objects.
OS = 0.369[[alpha].sup.2] - 0.408[alpha] + 0.156 Red filter
Burns, who was out 'lamping', shot Mr Lawson after his binoculars were picked up in a friend's red filter