Color Accentuation

This feature is similar to other software. 

The distinction of PhotoLab’s Vibrance slider is to automatically limit the increase of the saturation on already saturated tints on the one hand, and to avoid the clipping of the colors on the other hand.
– In the positive direction, it acts more strongly on the colors of nature, blues and greens 
– Its action is limited on yellows and reds as well as the flesh colors of portraits
– In the negative direction, it rapidly reduces reds
– It does not act on folded colors (dark hues)

The action of the Saturation slider is linear.
In landscape it is often agreed to accentuate the Vibrance and soften the Saturation.
Most of the creative presets proposed by PhotoLab do the same (generally vibrance +20 and saturation -20).
These two sliders should not be used in the same direction for redundant correction.

The interest of this tool is to intervene quickly for a small adjustment.

Click to enlarge – Alt+ < to return

Warm Tone Filter

This FilmPack function is interesting in the development process. It facilitates warming up the images without shifting the white balance on dark hues. It not change the presence of the colors and thus all the settings related to the contrast.
There is also the filter “Cold Tone”.

My own preset prepares the slider set to 10.  
– Activate the function by clicking the checkmark OR
– Start the correction to 15 by a Right Click on the left of the rail


Sepia Toning

The “Style – Toning” tool in the Color palette (FilmPack optional but recommended for more options) enhances the lights in photos taken at golden hour or blue hour.


Color Adjustment – HSL wheel

Based on the color wheel, the HSL tool (Hue Saturation Luminance) allows you to independently adjust the Saturation and Luminance and modify the hue of a defined color channel to a custom amplitude.

The automatic selection of the range to be modified is carried out with the pipette.
– Activate the pipette in the center of the wheel
– Determine the amplitude radius of the measurement (Ctrl + wheel)
– ENTER key to stop the pipette tool
OR Manually select a channel button


The initial division proposed by PhotoLab is divided into sectors on the color wheel. But there are actually eight customizable channels available. It is thus possible to assign a completely different color range to a channel.


http://tuto.dxo.free.fr/EN/Efficacite/Images_Eff/C3_palette_HSL_anim.gif

Use of the tool: 
– Select the channel to adjust
– Act on the Saturation or Luminance sliders
– The external handle allows you to change the color of the channel
– The central handles define the transition with neighboring colors
– Internal handles widen or narrow the range of tint to be adjusted

The division of the color wheel can be adjusted as needed (animation).
– Click held in the circle to shift the tint range to modify
– Double click in the circle to reset the hue range
– Double click on an external handle to reset the offset
– Double click on the colored button to restore the initial position in the chromatic circle

Click to enlarge – Alt+ < to return

The illustration shows two different corrections on the green channel.
– The blue channel is shifted towards magenta then enlarged on the green side
– Secondly, the green channel is corrected

The action of the particular algorithm of this HSL correction gives a result different from that brought by the accentuation of the colors (see the explanation of DxO at the bottom of the page).

Regarding the accentuation of colors:
* Saturation slider action is more natural and smoother
* Saturation is more contained for high values
* The range of the effect of the Global Saturation slider of the white button (master) is doubled
* Hue shift has less influence on luminance than its local correction counterpart
* Variation in Luminance has much less impact on Saturation compared to luminance settings

Click to enlarge – Alt+ < to return

The Uniformity slider equalizes or emphasizes variations in hue in the color range (at +100 it returns all neighboring hues to the selected one).
It is very useful for subtly blurring the redness in a portrait taken in natural light.
– Slightly shift the color of the red channel to orange
– Increase the uniformity of the orange channel
This technique allows a different approach to the “DxO portrait” rendering.


The area of influence of a channel can be visualized by holding down the Ctrl key and the left click of the mouse in a sector of the wheel.
– Wait a second to see the effect


Note also that activating the selection eyedropper limits the scope of the quick comparison (Ctrl + D) to color adjustment.


Switching to another correction when the pipette is activated does not disengage the HSL tool.

DxO thought that the user needs to adjust a correction (Contrast, Tone,…) and wishes to return to this correction.


According to DxO: The HSL algorithm is applied in a particular color space where the image is not represented in terms of red, green and blue as usual, but in terms of hue, saturation and lightness.
Refer to Wikipedia articles on tint.
https://en.wikipedia.org/wiki/Hue and
https://en.wikipedia.org/wiki/Tints_and_shades

It was very difficult to define where the green ends and where the yellow begins. The current value is a compromise that has been chosen to ensure that vegetation (grass, foliage) seen as green by the human eye will be considered green.

The Uniformity slider lets you make similar hues more or less equivalent.
Suppose a portrait where the skin must be (obviously) flesh-colored. Often, due to mixed lighting conditions or inhomogeneity of the skin, some parts are a little reddish and others a little yellowish. By adjusting one of the shade ranges (for example, orange) to match your model’s skin, and increasing the Uniformity, you get a nice skin tone.

The saturation on HSL (master / all channels) and the Saturation emphasis, in the Colors palette, are different. They are applied in different color spaces and work slightly differently at different stages of processing.


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