What are the characteristics of feature films and reverse films?

Color reversal film produces positive film, which is called slide, slide or krom film. Slides are made by installing pictures in cardboard or plastic boxes and can be viewed by a slide projector. Slides generally adopt smaller specifications such as 120 and 35mm. Transparent positive film refers to slides or framed or frameless positive films that do not need to be watched by a slide projector. The name krom generally refers to transparent positive films.

Color reversal films are widely used in professional color photography (except portrait photography and wedding photography, whose final product is photos). The reason is that most commercial photography is used for publication printing. For example, printed on magazines, catalogues, advertisements or loose-leaf printed matter. Transparent positive film can be conveniently and accurately used for plate-making printing. Printing plate-making requires fine technology and color separation by computer scanner. Because the transparent positive image is a complete positive image, the color separation through this film is also through the original sample. This is very different from the color separation of negative images taken from negative films. Because in this case, you have to print a positive image from the negative, and then use this second-rate image for color separation. The color separation draft made according to the replica is inevitably not very realistic.

Color reversal film also has its advantages. First of all, the cost of using this membrane is lower. If you want to shoot a lot, the production cost is more important. Secondly, most photographers think that the photos printed by transparent positive films through negative films are more realistic, rich and saturated in color. Third, Kodak color reversal film has been considered as the finest film for many years. For example, imagine several huge panoramic photos of Kodak at Grand Central Station in New York, which cover the whole wide wall of the building. The light boxes composed of these "color lights" are actually made of 35mm Kodak color reversal films. Magnified by more than 100000 times of the original film, almost no particles can be seen.

However, color reversal film also has its inconvenience. First of all, its tolerance is very small. If you are slightly underexposed or overexposed, you may destroy all the images.

Secondly, if you want to print a negative photo through transparent positive film, you can do it, but you will always lose something in the process of copying. In other words, the quality of photos taken with transparent films is always inferior to that printed with color negative films.

colour negative film

If you want to take photos, keep them as albums or prepare for exhibitions, you should use color negative films. In the field of commercial photography, such as portrait photography and wedding photography, customers always want to get photos, and color negative film just meets this demand.

In the past, people often thought that the image particles of color negative films were always thicker than those of color reverse films, but this was not the case. Although the color reversal film still retains the top of fine particles, some color negative, such as Kodak RoyalGold25 and Kodak Royal Gold 100, have fine and clear image particles and high resolution. Kodak Royal Gold adopted the newly developed "T particle" emulsion. We talked about it in the previous interview.

Color negative film has a great advantage: its tolerance is much larger than that of color reverse film. Especially overexposure doesn't matter at all, although its width is smaller than that of black and white film. When the exposure of color negative film is less than one block or more than two blocks, useful images can still be obtained. The reason is that when printing or enlarging photos with color negative, it can be adjusted appropriately in the process to save exposure error. If you use color reversal film, you won't have this "second chance" You must be the object of your shooting.

You can also use color negative to make transparent negatives. However, the effect of color saturation and image definition is much worse than that of original shooting with color reversal film.