No right-click allowed. ยฉ Mareike Keicher

Tag : curves


Discover the Power of a “Solar Curve” for Precise Photo Editing

What is the “Solar Curve”?

The “Solar Curve” looks like a wave created from the normal linear curve inside of Photoshop. Normally 4 or 6 points make sense in this context. Mathematically one divides the entire range (0-255) into 5 or 7 parts and sets accordingly the points:

4-point Curve

If you want to set 4 new points, simply divide the 255 (maximum) by five and get 51. These points result accordingly:

Input / Output


It will look like that:

6-point Curve

If you want to set 6 new points, you simply divide the 255 (maximum) by seven and get 36. Accordingly, these points result in:

Input / Output
109/255 * actually 108, has been rounded up
218/0 * actually 217, has been rounded up

It will look like that:

What does the Solar Curve do with the image?


As you can see in the image, the Solar Curve converts small contrasts to extreme changes. This creates a very alienated but also enlightening view. This view is ideal for revealing sensor spots/freckles or a single hair, but also for better judging the subtle transitions between light and shadow.

Here it reveals everything that could be somewhat “dirty.” So here’s a round of critique of my own work (from a time when the solar curve was not yet part of my standard workflow):

On the left, you can see a bit of banding; at the top, a sensor spot, and there are still a lot of spots on the forehead. Did you notice that in the image above?

Why do you need such precise editing?

Why do you need such precise editing? This question often comes up (“No one sees that anyway”), and usually, that’s true. One thing you must not forget: not every screen is the same. Those aspects that your screen may not display could be displayed on another screen (possibly a low-budget discount screen that has been in the public office of a pro-chain smoker association for years and has seen better days – if you can call it that) can look completely different – and indeed by unnatural extreme shifts. Such editing errors are no longer almost invisible.

Another example is backlit displays – everything that is printed and then backlit should be very smooth and clean. Mirror foil is also really mean and does not always reveal the best in retouching.

When working for a client, you never know what they will do with the files – maybe just a brochure is planned, but later on, an exhibition or fair might ask for a large format display. You never know.

Working with a visible Solar Curve?

Doesn’t that sound tempting? Immediately seeing where these minimal changes still need to be made, that sounds great, doesn’t it? I use the Solar Curve for sensor spots, clone stamp, double-check, and hair. To sum up, everything you want to remove 100% clean and has very low contrasts. Miraculously, you can use this view as a negative or with additional contrast enhancement to uncover even more problem areas.

For everything else: Leave it. You run the risk of retouching away any naturalness.

You can find more expert knowledge on Retouching Techniques in our blog section.
Have you found any mistakes, or do you have any suggestions, additions, or thoughts on whether this post is outdated? Then we look forward to your comment. You are welcome to share this post. We are very grateful for every recommendation.

2-Point Curve as best option to do Dodge&Burn

Discover the Best Dodge and Burn Techniques


The Dodge & Burn technique can be approached in different ways and there are many opinions on how to make certain parts of an image lighter or darker. In this article, we will discuss various methods and test them for effectiveness.

Dodge & Burn Tools (DE: Abwedler & Nachbelichter)

The Dodge & Burn tools in Photoshop have been available for a long time. Many users have experienced using the Dodge tool to brighten an area of the image, only to realize they’ve gone too far. They then use the Burn tool to compensate and end up with light and dark patches that don’t fit well together. As a result, many people avoid using these tools altogether.

So here we have listed a number of alternatives for you to choose from:

50% gray layer

However, a better approach is to create an additional layer filled with neutral gray (50% gray) and switch it to the “Linear Light” blending mode. This layer doesn’t change the image at first, but when made lighter or darker, it affects the image’s overall brightness. To fix a mistake, you can paint 50% gray to restore the image to its original state. Some users prefer using the “Soft Light” blending mode as it has a subtler effect, but it affects the saturation of the image, which should be taken into account.

Pro Tip: You can also leave the layer empty and paint with black or white – the effect is 100% the same and saves storage space.

Multiple RAW conversions

Another technique that can be helpful is using multiple RAW conversions that differ in exposure. You can use one conversion for skin tones, another for the background, and another for the hair, depending on what the image requires. Then, you can load these individual RAW conversions as layers in Photoshop and mask them accordingly. However, you should only use this technique at the very beginning and it can inflate the file size.ย So you have to be sure of your decisions here.

Dodge & Burn Curves

Two curves, one for Dodge and one for Burn, are the optimal solution for using Dodge & Burn. Masking the effect in and out with white and black is straightforward. Switching between layers is easy with the following shortcut:

Windows: Alt +, (down), or Alt +. (up)
Mac: Option +, (down), or Option +. (up)

However, learning how to use curves for Dodge & Burn properly is necessary, as curves can influence not only luminance but also saturation and contrast, and small differences can result in significant changes.

Conny Wallstrรถm, a photographer, retouching teacher, and software developer based in Sweden, tested various curves and developed a 2-point gradation curve that reproduces the most natural and realistic way of dealing with color. This curve is integrated into a retouching toolkit, which creates two folders and includes hue/saturation corrections. These hue/saturation corrections are a measure against saturation problems caused by Dodge & Burn and make the most sense when processing skin.

More technical insights into the development of this method:

These curves were created by comparing them with the results of exposure levels from the raw converter in Capture One. The idea was that a raw converter like Capture One reproduces the most natural and realistic way of dealing with color with different exposures without causing color problems or shifts. Therefore, if we use these Dodge & Burn curves, we can expect a natural, realistic result. At the same time, we can work consistently and efficiently, since it is a Photoshop action that always works the same way.

But that’s not all. Many who already use this retouching toolkit know that this action creates two folders, and in addition to the special curves for Dodge and Burn, hue/saturation corrections are included. Here’s why the hue/saturation corrections are necessary:

When we analyze a portrait image , we find that increasing luminance tends to decrease saturation, while decreasing luminance tends to increase saturation. If we only lighten an image based on luminance, the proportion of saturation in the now lighter areas becomes too high (and vice versa). Therefore, using hue/saturation corrections is a measure against saturation problems caused by Dodge and Burn, which saves editing time in retouching.

These hue/saturation corrections are particularly useful when processing skin (skin texture, blood flow in the skin). Of course, this cannot be generalized 100%. Every image requires slight adjustments to the hue/saturation correction layers due to other camera manufacturers and raw formats. Therefore, it is recommended to adjust those layers slightly for each image. However, one cannot avoid looking at the saturation in the image afterward, at least briefly.

Hidden Gems / Tips and Tricks

Pro tip 1: Separately adjusted curves are also useful for very granular, high-contrast structures such as makeup (see example below) and are useful to avoid flattening the contrast.

(Photo by ๐•๐ž๐ง๐ฎ๐ฌ ๐‡๐ƒ ๐Œ๐š๐ค๐ž- ๐ฎ๐ฉ & ๐๐ž๐ซ๐Ÿ๐ฎ๐ฆ๐ž from Pexels)

Pro tip 2: Additionally, the Dodge & Burn tools work well for eyebrows. If painted on an empty layer, you can achieve a more realistic result by painting individual hairs lighter or darker.

Don’t forget Dodge & Burn is much easier by usingย Wacom tablets.


Looking for more tips and tricks to improve your retouching skills? Check out the other articles in our Retouching Techniques blog section.

Do you have any suggestions, additions, is this post out of date, or have you found any mistakes? Then we look forward to your comment.
You are welcome to share this post. We are very grateful for every recommendation.