Levels adjustment

Settings

Apply this adjustment via the Adjustments panel using the following settings:

• Colour space—select a colour mode (Grey/RGB/CMYK/LAB) from the first pop-up menu.
• Channels—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 colour channels, excluding alpha channel. Select from the second pop-up menu.
• Black—determines the range of pixels in the image considered to be pure black. Drag to the right to include pixels in the range (thereby increasing shadows), drag to the left to exclude pixels (thereby reducing shadows).
• White—determines the range of pixels in the image considered to be pure white. Drag 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. Drag to the left to redistribute pixels towards the black point, drag to the right to redistribute towards the white point.
• Opacity—controls how see-through the adjustment layer is.
• Output Black—determines the range of pixels in the output considered to be pure black. Drag to the right to include pixels in the range (thereby increasing shadows), drag to the left to exclude pixels (thereby reducing shadows).
• Output White—determines the range of pixels in the output considered to be pure white. Drag to the left to include pixels in the range (thereby increasing highlights), drag to the right to exclude pixels (thereby reducing highlights).

The following options are also found on the dialog:

• Merge—applies modifications set by parameters and settings to layers below and exits Levels adjustment.
• Reset—reverts all adjustment settings to default.
• Delete—deletes the Levels adjustment and its layer from the panel.
• Add Preset—adds the current adjustment settings as a preset for use with later images and projects.