How to achieve a movie-level tint of a photo

Many film friends like the tone of the movie very much, hope the digital photograph also can according to the method of the movie to color, in order to obtain bigger dynamic range of color processing. Now with the development of technology, in Photoshop through file mode conversion and software control can easily achieve film-level color palette, so that your photos get more shocking, more advanced color performance.

To achieve the film-level color palette processing, simply to convert raw to log mode, and then load 3D lut file. Let's briefly introduce the techniques and concepts in the log mode, 3D Lut and other movies, and illustrate the specific application in Photoshop through a case.

About log Mode

The digital negative for the digital SLR camera is the raw format file. Although the SLR camera raw tolerance is very high, but it is in srgb/adobe RGB color space presented to the user, so raw pictures, if not processed, and the camera straight out of the JPG no difference.

The original film taken by SLR camera

In contrast, digital video uses log mode, which is a matching format between movie platforms, using a flat logarithmic curve to represent data, because the shape is similar to a logarithmic function, so it's called log. Because the color space of the log is very big, latitude also correspondingly becomes big, so the dynamic range of the camera can play to the extreme. Almost all of today's professional cameras are using log mode to shoot high quality images, but the SLR camera does not currently support log mode.

Convert to log (image dimmed and flattened, light and shade levels are out)

Log "flat" camera captured image information, with "full dynamic range" of the characteristics of the record. So the log image looks gray and flat, but it contains and records a wealth of bright and dark details. To use a good log image, and to render the film the same effect, you must color the base of the gray screen, so the log material must match and load Lut to correctly display and film-level palette.

About 3D LUT

LUT is the abbreviation for the Look up table, meaning "lookup tables." With a text editor to open the Lut file, you can see that Lut is just a set of numeric tables that represent the original value of RGB and the target values of the map, meaning that the original image's color is mapped to a new color. Essentially, the role of LUT is to convert each set of RGB input values into output values, while RBG data is independent of each other.

Because of the color control function of one dimensional LUT model combination, there are some limitations, only affects Gamma,rgb balance (grayscale) and white fields, so precise color control is most commonly used in three-dimensional LUT (3D LUT), because it can be accurately converted to the data entered for each image pixel, At the same time, the simulation of aesthetic quality can realize the control of three-dimensional color space. The 3D Lut has an RGB channel in each coordinate direction, which allows all color information to be mapped and processed, even to the gamut where the film cannot be displayed.

How to achieve movie-level rendering of photos

Through the above film palette technology Learning and bedding, the purpose is to allow photos can also use log mode load 3D Lut to color, in order to achieve the image of the film industry-level palette! These can be achieved in Photoshop. Below we illustrate the steps and methods in detail with a case demonstration.

Usually the color space of the film is log log space, only load Lut to display correctly. Many digital cameras do not have log preset files, even if the hands of a Lut file can not achieve the so-called film palette. Therefore, the digital photo to simulate the film color palette is the premise that the raw format of the digital film must first be converted to log mode. The conversion of raw to log is the conversion of the color palette of camera photos to the color palette of the movie. Once the raw is converted to log mode, Photoshop can also load 3D lut into the movie-level industrial process to color the palette!

First step: Get log file

Click on the link to download: Http://pan.baidu.com/s/1pKRx56F (password: lmor) data to find the "Visionlog" folder, folder contains some camera LOG.DCP files. After decompression, get the "Visionlog" folder.

Step Two: Import files

Using Mac OS users, copy this folder to the hd:/user/yourusername/repository/applicationsupport/adobe/cameraraw/cameraprofiles

Users who use Windows systems can copy to C:/users/yourusername/appdata/roaming/adobe/cameraraw/cameraprofiles

The third step: ACR change color channel

Select a raw format picture file in Bridge. Open in Camera raw, select the color depth in the workflow window as "16 bits/channel", so that the picture has a larger dynamic range.

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