The Lightroom tone curve is one of the most powerful features of Lightroom. You can do so much with the tone curve and it forms the basis of most presets. Because of this I think it’s also a little intimidating at first.
If you don’t understand the tone curve, you probably just use the whites, blacks, highlights and shadows sliders in the basics panel. We all start out there. It looks like they do the same thing and they’re much easier to operate than the tone curve at first glance. That’s absolutely fine when you’re new to Lightroom, but once you become more proficient in Lightroom editing, you’ll want to use the tone curve tool.
Used well, the Lightroom tone curve is like a magic wand that abracadabras your photos to the next level.
What is the Lightroom tone curve?
The tone curve is a tool in Lightroom used for adjusting tones to make images brighter or darker, and to adjust colors. Tones, from shadows, to darks, midtones, lights and highlights are adjusted using the RGB curve. Colors are adjusted using the separate red, blue and green curves.
Both the RGB tone curve and the color tone curves are divided into 4 areas, starting from the left:
A diagonal line between the bottom left corner and the top right corner is the line that you adjust to alter the tone curve.
Where is the tone curve in Lightroom?
The tone curve tool is a panel on the right of the Develop Module. Both the tone and color curves are in the same panel.
Why use the tone curve tool vs sliders in the Basic panel?
Not counting the color curve channels, you might well wonder why use the RGB tone curve in Lightroom to adjust light and dark areas of a photo when you can do the same thing with the whites, blacks highlights and shadows sliders in the Basic panel.
Well, that’s because the tone curve works differently from these sliders. They both work, but have different results.
With the shadows and highlights sliders, the adjustment is more targeted to that part of the image. So, if you adjust highlights, there’s minimal impact on the shadows and vice versa.
That said, when using curves you have more control over contrast, because you can anchor the midtones so that they’re not affected, then adjust highlights, lights, darks and shadows. Even taking the lights and darks to extreme you’ll maintain detail in the midtones. So, with curves you can get a much punchier image with greater detail over the entire dynamic range than you would using the sliders in the Basics panel.
To demonstrate the effect of taking each tool to the extreme, above I adjusted only the sliders as far as they would go and below I adjusted only the tone curve as far as it would go for lights and darks.
However, for a well processed image, use both the tone curve and the sliders in the basic panel to make adjustments as needed.
After looking at the previous two extremes, this balanced photo appears quite faded. This is why it’s a really good idea, when processing photos, to review the before and after images regularly to make sure you haven’t taken your editing it too far.
How do I create a custom tone curve in Lightroom?
Before you get into creating a custom Lightroom tone curve, you might want to experiment with the other (easier) ways first. In total there are three ways to use the RGB tone curve to adjust tones in an image…
1. Linear tone curve presets
If you don’t want to set it yourself, you can select one of two presets:
- Medium contrast
- Strong contrast
Just click the up/down arrows next to “Point curve”. A drop down menu will open and then select the tone curve preset you want to use.
2. Linear tone curve regional sliders
If you’re new to using the tone curve in Lightroom, but want some control editing your Lightroom tone curve adjustments, start by using the regional sliders in the linear tone curve panel.
It’s like having training wheels on. You can adjust the curve, but the adjustments you make will be more controlled.
3. Custom tone curve
For full control of the tone curve in Lightroom, you need to change the point curve from linear to custom and add curve points to the curve, then adjust by clicking and dragging on the points.
To switch between the linear tone curve and custom tone curve, click the button on the bottom right of the tone curve panel, then set points on the tone curve. You’ll notice that “linear” switches to “custom” as soon as you set your first point.
The final aspect of setting a custom tone curve in Lightroom is to adjust the color curves. To access the red, blue and green curves click the up/down arrows next to “RGB” and select the color curve you want to adjust. More on this in a moment when we look at color grading in Lightroom.
What should a Lightroom tone curve look like?
There are no hard and fast photo editing rules on what a tone curve should look like, but the most common curve to use is the S curve.
For contrast and punch in a photo, here’s how to set the S curve:
- Create 3 points on the curve at the quarter, half and three quarter marks
- Pull the shadows point down
- Raise the midtones point slightly, or simply anchor them by not moving the point at all
- Raise the highlights point
For a flat image, with reduced contrast, you’d simply do a reverse S shape. In other words, raise the shadows and pull down the highlights.
But remember, S curves aren’t the only way to use the tone curve in Lightroom. You could also adjust just one area. For example to adjust midtones:
- raise the midtones by dragging the middle of the curve up
- or darken them by dragging the curve point down
The trick is not to go mad and make your curve look like the screen of a hillclimb workout on the exercise bike.
June 2020 updates to the tone curve in Lightroom Classic
The tone curve had a bit of a facelift in the Adobe June 2020 update and the interface is now much more user friendly. There were also a few subtle, but very useful changes to the functionality of the tone curve.
Find our more about the changes here: June 2020 Lightroom Classic update – what’s new?
What is color grading in Lightroom?
As opposed to color correction, which is to correct colors (no kidding!) to appear more accurate in an image, color grading is a creative photo editing process that infuses emotion into an image by manipulating color.
The use of complementary colors features heavily in color grading in Lightroom as do contrast, hue, saturation and luminance adjustments.
There’s a lot of talk these days about creating a cinematic look in Lightroom photo editing and this is essentially about color grading a photo for a film look.
How do you create a cinematic look in Lightroom?
The tone curve tool is an essential part of creating the cinematic look in Lightroom using both the RGB tone curve and the color tone curves.
Because black and whites in film aren’t as stark as in digital photography, the starting point for a cinematic look is to fade the blacks and the whites. Do this by:
- Slightly raising the far left curve point on the RGB tone curve to fade the shadows
- Then slightly lower the far right curve point to flatten the highlights
An easy way to introduce complementary colors to photos in post production is to use the color curves. Each channel can be adjusted for its complementary color. So:
- Red can be adjusted up for more Red or down for Cyan
- Green can be adjusted up for more Green or down for Magenta
- Blue can be adjusted up for more blue or down for Yellow
So, after adjusting the darks and highlights, switch to the color curves channels and:
- Raise the far left curve point to add blue into the shadows or drag it to the right to add yellow to the shadows
- Lower the far right curve point to add color to the highlights or drag it to the left to add blue to the shadows
To demonstrate the effect I pushed the blue channel further than I would normally do, so it’s really obvious in this image.
Whatever you do, make sure that your adjustments are small so that your photo doesn’t look over processed. Especially with color curves – it takes a tiny adjustment to make a big difference to a photo.
Last words on the Lightroom tone curve
As soon as you understand how the tone curve works, you’ll see that it’s not difficult and it offers so many great opportunities for different edits. To develop your own photo editing style in Lightroom, you need to get to know the tone curve tool. You’ll love it!
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By Jane Allan
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