The basic functions of black-and-white photography include tone control.

The basic function of color tone in black and white photography includes controlling color tone.

Tone: Tone refers to the overall tendency of colors in a painting, which is a great color effect. The overall color tendency of both. Fish's tone is often emotional.

As the main tone, render the theme. Just like China Red, as an example of positive color in China's emotional philosophy, in nature, we often see such a phenomenon: objects of different colors are either shrouded in a golden sunshine or a pale blue moonlight, like veil mist; Or locked in a cage by the charming gold of autumn; Or unified in the silvery white world in winter.

This color phenomenon is hue. Objects with different colors are wrapped in a certain color, so that objects with different colors have the same color direction.

2. Tone: For photographic works, it refers to the light and dark level of the picture, the virtual and real pair, and the relationship between hue and light of color. Through these relationships, the viewer feels the flow and change of light. Explain the basics first: a color represented by modern data has three elements: hue, saturation and lightness. Among them, the three levels of black, white and gray are the changes of lightness.

A picture without color, not only the hue and saturation, but also the lightness, becomes a black-and-white photo. Here, black-and-white photos are hierarchical changes between black, white and gray. On this basis, we can talk about hue, because we have no characteristics of color. We call the tone in black-and-white photography "tone", which is characterized by showing rich and colorful tones.

Then let's upgrade. The hue of color photos is based on color. Adding color to black and white will make black and white have rich color changes. Conventional sound is this combination routine.