How to Use Levels in Photoshop

Two Ways to Apply Levels

Image > Adjustments > Levels bakes the change into the layer you are on – that is destructive editing. Layer > New Adjustment Layer > Levels creates a separate Levels layer instead, which you can toggle off, re-edit, mask or delete at any time. Always use the adjustment layer.

Reading the Histogram

The histogram shows how much light information sits at each brightness value: darks on the left, lights on the right. A landscape with deep shadows and a bright sky shows two clusters with little in between – exactly what you would expect. The three sliders beneath it set your black point, midpoint and white point.

Input Levels

Drag the left slider right and everything to the left of it becomes pure black. Drag the right slider left and everything to its right becomes pure white – that is how you set true blacks and whites and give an image contrast. The middle slider shifts the midtones brighter or darker without moving either endpoint.

Output Levels

The lower slider pair does the opposite: it compresses the range. Drag the left output slider right and your blacks become gray; drag the right one left and your whites become gray. This is how faded and matte looks are built.

Color Work by Channel

The Channel menu is set to RGB by default, which is where exposure lives. Switch to an individual channel and Levels becomes a color tool, because each channel works between complements: Red and Cyan, Green and Magenta, Blue and Yellow. On the Blue channel, for example, input levels push yellow into the shadows and blue into the highlights, while output levels do the reverse. Combine several channels and you can tone an entire image from one adjustment layer – then drop the layer opacity to dial the whole thing back.

Eyedroppers and Presets

The three eyedroppers set black point, white point and gray point by clicking on the image. The gray one also neutralizes color, but it only works when there is a genuinely neutral, unsaturated area to click – most of the time the sliders give better control. The preset menu holds built-in options like Increase Contrast, and the panel menu lets you Save Levels Preset so a look you built for a client is waiting for you in every future document.

Quick Reference

• Layer > New Adjustment Layer > Levels – the non-destructive way
• Input levels set black, mid and white points; output levels compress them
• Channel complements: Red/Cyan, Green/Magenta, Blue/Yellow
• Double-click the adjustment thumbnail to re-edit at any time
• Panel menu > Save Levels Preset – reuse a look across images