How to use ps or mobile phone retouching software to bring up the effect of autumn filter?

Nothing new, just a romantic name. The essence is infrared photography, which has existed since the film age. At that time, infrared sensitive film was used, but in the digital age, CCD and CMOS of digital cameras are also sensitive to invisible light (including infrared light), which will cause imaging interference. In order to avoid that both invisible light and visible light can make CCD(CMOS) sensitive at the same time, which will affect the imaging quality, all digital cameras adopt CCD(CMOS). In other words, infrared photography is an inherent feature of digital cameras, but generally speaking, we shoot visible light, so digital cameras are shielded.

However, some photographers like to take infrared photos, so some people take the old SLR apart to remove the low-pass filter and add a crimson filter to filter out visible light. So the modified camera can't shoot visible light, but several cameras are used to achieve this effect (I guess one of them has no low pass and a filter to filter visible light). In addition, because the refractive index of infrared light is very different from that of visible light (in fact, the refractive index of different bands of visible light is different, so low dispersion is an important indicator of the lens), infrared light is invisible to the naked eye, so focusing depends on estimation. And the cost of renovation is too high.

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Infrared light is colorless because visible light is removed. Theoretically, infrared photos are gray-scale images, just like X-rays, except that the white part of infrared photos is where the infrared intensity is high (hot), and the black part is naturally weak in infrared radiation, so the brightness is different from that of visible light. Because they rely on infrared rays, they can shoot in the dark, which is the charm of infrared rays. Then those color infrared photography works are post-dyed on the basis of infrared black and white film.

Ordinary photos can also be simulated by PS, but only by simulation, because the brightness of ordinary photos is the intensity of visible light, which is different from infrared light and dark areas. To simulate, it is necessary to analyze the photos and adjust the brightness of different areas in the picture according to experience to conform to the physical laws. For example, the human body and leaves irradiated by sunlight are white, while the sky is black. After adjusting brightness, dye/color. Since it is dyeing, it has the nature of artistic creation, and it is not necessary to stick to physical characteristics completely.

Open a photo.

original drawing

Copy a layer, the original yellow-green leaves turn blue after inversion, choose blue to magenta with the optional color tool, and then set the layer blending mode to color.

Blending mode: color

Copy another original layer, and use the black and white tool to modify the color brightness and turn it into black and white. Mainly to reduce sky blue and improve the brightness of green. Other colors depend on the situation. Then set the layer blending mode to: lightness.

Turn black and white.

Mixed effect

Finally, seal and add 40 natural saturation to complete.

Final effect

Imitating infrared photography is mainly to pay attention to these areas in the sky that lack infrared rays (the sky is not an object, so it will not reflect thermal radiation), reduce the brightness and improve the brightness of the light-receiving surface, because the surface of the object irradiated by sunlight has thermal radiation, and mastering this principle is basically like dyeing. Dyeing is your favorite.

I hope you like it.