What is hue and hue?

Tone refers to the "tone" of a photo. A picture with blue, purple and white as a whole is called cool tone, and a picture with red, orange, yellow and black as a whole is called warm tone, which is one of them. Another concept is that the warm and cold colors are relative. In the past, the color of fujifilm was blue-green and cold, while the color of Kodak film was orange and yellow and warm.

The concept of hue shadow refers to the change of light and shade. Objects with the same color will show different color saturation and even different colors (color temperature effect) under the action of light. After color saturation is removed, any color in the R/G/B channel will be "gray". In black and white photos, red is dark gray and yellow is light gray.

The tone of a photo, or the change of tone, is not easy to distinguish with the naked eye if it can't be compared at the same time. For example, how much yellow or blue should we remove when correcting color cast? There is no uniform standard. Even if you use the same brand of monitors to watch, everyone's perception of color still has individual differences. Therefore, each of our film friends is sitting in front of their own monitors to discuss color tones, which I think is a difficult topic to explain. However, the tone of discussion is not like this! At present, all monitors have reached the level of expressing brightness changes with 256 shades of gray and brightness, and the shades of gray and brightness changes are clear at a glance, and the standards can be seen (although there are also individual feelings differences).

Plane photography, whether black and white or color, uses countless color points (pixels) with different brightness to reproduce the picture, although 256 gray brightness and 8-bit channel color are enough to restore the colors in nature to the display. However, because the shutter of the camera is opened at one time, the exposure time of each pixel is the same, in other words, each pixel has the ability to express the brightness of 256 gray scales, and the exposure mode of the shutter limits the expressive ability of pixel exposure according to a standard. Then, when shooting in a large light ratio environment (side light, side backlight, backlight), when the subject is in the tone of light and dark, the pixels corresponding to the bright part are inevitably overexposed, and the pixels corresponding to the dark part are underexposed, so human intervention (exposure compensation) must be carried out. It is the above characteristics of the camera that make it difficult to get well-defined and delicate photos! In the past, darkroom technology used partition exposure, modern digital technology used HDR, and D light processing technology, as well as color scale adjustment in later software and coating technology in PS. And so on are all follow-up means to get delicate and distinct timbre and timbre design!

In actual shooting, many movie friends like Gao Fancha's high contrast tone, especially the later adjustment. The details are pulled like a flat plate, and the most typical thing is to make MM's face look like a white pie (disgusting)! The dark details of natural scenery and architectural scenery darken, and the skin and flowers are completely dependent on the later stage, which leads to the color separation of the image ... These practices invisibly expand the physiological defects of the camera! Throw away the details you want.