What does the black-and-white photographic filter do?

What does the black-and-white photographic filter do? Let's take a look at Bian Xiao's sharing today.

In the final analysis, the function of black-and-white photographic filter is to adjust the contrast effect of the subject, so it is also called "contrast filter". In practical application, the purpose of using contrast filter is nothing more than two aspects:

1, in order to realistically show the tone effect of the scene.

2. To strengthen or weaken the contrast effect of the subject for some expression intention.

Expand knowledge: What are the black-and-white photographic filters?

The filters commonly used in black and white photography generally include red, blue, green and yellow mirrors.

1, yellow filter

It can absorb blue and purple through yellow, orange, red and green. The part that passes through the spectrum is about 500 to 700 nanometers, and the $ part of 600 nanometers passes more. Yellow filter can be divided into dark yellow, medium yellow and light yellow according to color depth.

2, orange filter

It can absorb blue, purple and a little green light through yellow, orange and red. The part that passes through the spectrum is from 560 to 700 nanometers.

3. Red and orange filter

It can absorb blue, purple and quite a lot of green through yellow, orange and red. Part of the passing spectrum ranges from 590 to 700 nanometers.

4. Red filter

It can pass red, orange and yellow, with red passing the most and absorbing green, cyan, blue and purple. The part that passes through the spectrum is about 600 to 700 nanometers.

5. Green filter

Through yellow and green, green has the largest throughput, absorbs purple, blue and red, and can also absorb most of orange. The part passing through the spectrum is about 500 ~ 600 nanometers.

6. Blue filter

The light that can penetrate is blue, cyan and purple. Blue penetrates a lot and absorbs yellow, orange, red and purple. The part passing through the spectrum is about 380 ~ 500 nanometers.

7. Sky filter

The mirror is half yellow and half colorless. When in use, the yellow part is placed on it to absorb the purple light in the sky, and the colorless part can let the light of the ground scenery pass through completely. There is no need to increase the exposure time when shooting scenery with this filter.