Levels Output

[Tomall]

Looking for advice on Affinity Photo Levels, in particular what is the function of the WhitePoint and Blackpoint Outputs compared to the Input settings.

Thanks

[firstdefence]

https://affinity.help/photo/English.lproj/pages/Adjustments/adjustment_levels.html

Quote

Settings

The following settings can be adjusted:

• Select a colour mode from the first pop-up menu.
• Specify a single colour channel to apply the adjustment to, including the layer's alpha channel. Master (the default choice) applies the adjustment to all channels. Select from the second pop-up menu.
• Black Level—determines the range of pixels in the image considered to be pure black. Drag the slider to the right to include pixels in the range (thereby increasing shadows), drag to the left to exclude pixels (thereby reducing shadows).
• White Level—determines the range of pixels in the image considered to be pure white. Drag the slider to the left to include pixels in the range (thereby increasing highlights), drag to the right to exclude pixels (thereby reducing highlights).
• Gamma—determines the distribution of mid-tone pixels in the image. Enter a gamma value or drag the slider to the left to redistribute pixels towards the black point, drag to the right to redistribute towards the white point.
• Output Black Level—remaps the output level of absolute black. Moving the slider to the right makes the image look more pale and washed out.
• Output White Level—remaps the output level of absolute white. Moving the slider to the left lessens the intensity of highlights in the image.