Positive and negative effects of photography skills

Positive and negative photos are taken with positive films, but when developing negative films, instead of using normal E-6 developer, ordinary negative films are developed with C-4 1, which makes the original normal positive films become negative films, and the normal colors cannot be obtained by using this color film base, instead, it becomes extremely gorgeous color expression. Its biggest feature is that the picture will produce extremely bright colors, with great contrast between black and white and extremely narrow exposure latitude. It is the most difficult shooting type to control exposure in all professional wedding photography and professional children photography.

Reaction and discussion of photography market

It is difficult to control the exposure of such photos, but if they are taken successfully, the pictures will be unique and eye-catching. Therefore, both the response of consumers and the evaluation of general professional photographers are quite high. There are not many photographers who can take such photos well. After all, unlike the 160-degree negative used in general professional portrait photography, the exposure latitude is large and the contrast is low, so it is easy to shoot portraits with soft tones. Moreover, in order to avoid the complexity of exposure and light ratio and prevent failure, general photographers usually stay in close-up photos of portrait formula composition types that are easier to shoot. Therefore, at present, most of these photos owned by consumers are close-up compositions, and it is difficult to have high-level works beyond this composition.

In fact, if we can use the portrait composition of landscape art type and master the skills of scene, light ratio and color planning to shoot such photos, then the color and saturation of the works can surpass the level of portrait formula composition type photos and reach the peak of portrait photography art.

Key points of shooting, technical description

1. There are two key techniques in shooting. One is the proper choice of negative film (actually positive film). In the light environment with sufficient light source, or when you want to achieve the effect of strong contrast and perfect portrait texture, you can use the positive film with medium and low sensitivity, for example, using the positive film with 64 degrees and 100 degrees, you can get quite saturated and gorgeous tones. It's just that the exposure latitude of the positive film with this sensitivity is extremely narrow. If the light ratio is not carefully controlled, the exposure will fail, showing underexposed dark brown or overexposed dead white.

In order to avoid exposure failure, or to get a photo tone with soft contrast, a positive film of about 200 degrees or 400 degrees can be used for shooting. At present, the 200-degree slide is the most widely shot on the market, because it has a large exposure latitude and is a film type with easy shooting and soft contrast. In addition, it should be noted that some brands of positive films will be biased towards extreme yellow tones or magenta and bright green tones after this abnormal treatment, which is of course related to the color temperature when taking pictures. In short, photographers should adjust according to their own preferences in order to get the ideal tone.

2. The second is the control of light ratio. When taking this type of photo, it is necessary to calculate the light ratio of the whole picture perfectly, that is, the contrast between the bright part and the dark part should not exceed three levels, otherwise it will form the extremely black or white Gao Fancha phenomenon and make the picture lose its halftone color. Especially when shooting a white dress in wedding photography, if the light is not properly controlled, only dead white will appear, and there is no intermediate tone. It is best to open one more file for the overall negative exposure, so that the most saturated color can be obtained when developing photos. The most taboo is underexposure, which will make the photos form ugly deep earthy tones.

3. In the post-processing, use printing soft focus as little as possible, otherwise it is easy to form black hair on the face of the portrait and penetrate into the white part, which becomes a very strange phenomenon. This is an inherent soft focus phenomenon in general post-processing, but it is more prominent in the photos of negative film development.