White Balance adjust is a preliminary common to all raw development software. That is why it is placed at the beginning of the “Basic Tools” palette whose tools are ordered to be reviewed from top to bottom.
The most efficient way to assign a color temperature to the scene’s illuminant is to use the “Temperature” slider to set the color rendering according to its memory.
The initial value (and by default by double clicking on the slider) is the one indicated by the camera (EXIF).
It seems more accurate to call “Dominant” the slider (Tint) allowing the adjustment of the drift, green or magenta, of the color.
The selection Picker Color is an excellent tool for capturing a white or gray area. The important thing is to choose it in the shade.
The dropeye sampling circle size can be changed to smooth out the measurement of selected pixels.
As far as possible, choose the largest radius to avoid an incorrect average value. This should be useful especially for noisy pictures.
– Ctrl+ / Cmd+ wheel. Picker diameter from 1 to 50 pixels
– Capture several areas and note the values to average them afterwards
– Enter the value manually
– Press ENTER to stop the pipette tool
* The pre-calibrated settings are of little use.
* To adjust an image with two illuminants (light sources) of different colors, the solution is to use the Local Adjustments.
When the photo is from an RGB file (JPEG or TIFF), the palette only shows a simplified “Color Temperature” slider.
Reminder for less experienced photographers: It is no longer possible to adjust the white balance of such an image, since it has already been set by the camera.
It is no longer a question to assign a color temperature but of correcting the dominant color (blue or yellow) from the image.
The problem with automatic white balance from cameras, is that it “average” the entire scene towards daylight. Thus, a sunset with warm colors by nature will be “cooled”.
In my experience I find it is easier to assign the temperature myself than to search for the atmosphere from a standardized image. White balance selector on my camera is therefore set to “daylight” (5600°K).
This technique consists in locking the shooting temperature in order to obtain the exact color of the light present at the time of the release. The sunset is orange-red, the warm atmosphere in the late afternoon or the blue light in the evening or early morning are correctly rendered.
Discovering your photo lit with an inaccurate light disturbs the memory of the colors of the photographed scene. During the development with PhotoLab, just move the slider slightly to find the feeling of the moment remained in memory.
The White Balance palette does not show the same colour temperature as the camera EXIF.
E.g., a photo taken with the temperature set to “daylight” = 5600K (Nikon D810) opens in PhotoLab at 5510K despite the mention “daylight”.
It seems strange that the temperature “Original / As Shot” is not read in the EXIF data.
User must set the desired temperature again in PhotoLab.
In PhotoLab as in other photo software, the temperature displayed in the user interface doesn’t correspond to the camera setting.
– Even when imposed, a camera does not respect the precise temperature / hue. In the EXIF, only the standard temperature range (cloudy, tungsten, …) is indicated.
– Different camera models not give exactly the same temperature / tint for a shot of the same scene with the same light.
The EXIF information is therefore not accurate.
If you have two cameras of different brands, you can set the same temperature value but they will not match.
You can only get the temperature you have chosen in your camera with the software of the manufacturer of your camera because it knows the table of correspondence between the scales of Temperature / tint.
In this field there is no standard. Each manufacturer does what he wants and does not share his information or at least not all that is necessary, it is impossible to reproduce the exact behavior of the camera.
So, since 2016, the temperatures / tints in PhotoLab have been corrected for the displayed presets so that there are no discrepancies when processing images from different cameras.
The temperature and hue displayed are only an indication to help with the adjustment.
How are the shooting temperature and hue adjusted ?
PhotoLab first uses the EXIF data, usually deduced by the “Automatic White Balance” to which it applies a conversion coefficient to obtain the light temperature of the scene.
For each of the camera profiles, DxO have a white balance scale for standard presets (cloudy, tungsten, …).
E.g., an image taken with the “daylight” setting but under a non-sunny light. The camera made some adjustments. PhotoLab does not display 5200K/0° but a different temperature / tint couple calculated from the WB scales of the body.
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