blue filter

基本解释

The image below is a single 20-second exposure taken with a red-green-blue filter.
下图是用红-绿-蓝滤光片拍摄的单一20秒曝光照片。
Banff Springs Hotel with light blue filter emphasizes the coldness of winter (Monochromatic color)
班芙泉酒店，用浅蓝色滤光镜强调冬天的寒冷单一色
DGD series cartridges are manufactured from 100% pure polypropylene and are sized for use in our big blue filter housings.
DGD系列的滤筒根据我们公司的蓝色过滤器量身定做，该设备使用100%的聚丙烯进行加工生产。
www.e-gtm.com.cn

Philips' solution is to combine two blue and one red element, but use a green phosphor filter to convert one of the blue LEDs to green.
ENGADGET
They photographed a Scottish tartan ribbon three times, once with a red filter, once with green, and once with blue.
FORBES: GPotD: Maxwell's Tartan Ribbon
Colour is added by using three separate arrays, each fitted with a filter for one of the primaries—red, green and blue—that, in combination, produce a full-colour image.
ECONOMIST: Curtains for celluloid