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The Techniques of Photo Restoration

Learn about the different techniques and tools used in professional digital photo restoration, including spot healing, clone stamp, curves, layers, and layer masks.

By Max Ernst Stockburger
The Techniques of Photo Restoration

What is photo restoration?

In our previous blog post, we have briefly described what photo restoration is and where it originated. Today we show you the different techniques we use when restoring damaged photographs.

Compared to traditional photo restoration we solely work with digital restoration tools. Digital photo restoration opens up completely new ways of repairing damages. Damages which, couldn't be repaired ten years ago.

"With Photoshop everyone can do his own photo restoration!"

This is something we hear quite often and technically it's true. Prices for image editing software such as Adobe Photoshop, Corel Paintshop or Adobe Lightroom have dropped dramatically over the last years. Nevertheless owning an ax and a hammer doesn't automatically turn you into a carpenter.

This is also the case for photo restoration. Good photo restoration is all about knowing which tool to use where and when. This needs a lot of expertise and experience.

A recent survey has shown that only 10% percent are satisfied with their own restoration work. Whereas 95% of the people needed at least twice as long as they expected.

The Tools

Adobe Photoshop offers plenty of different tools. Not all of them are necessarily useful when it comes to photo restoration. Here are the five most important ones.

Spot Healing Brush

The spot healing brush comes in handy for all kinds of small damages such as dust particles, scratches or smaller cracks. The tool works by analyzing the surrounding areas and filling the selected spot with the calculated average of that.

Spot Healing Brush with Content-Aware Fill
Spot Healing Brush with Content-Aware Fill
Before Healing Brush
Before Healing Brush
After Healing Brush
After Healing Brush

Therefore, it works best in large homogenous areas. As soon as the areas become more detailed and inhomogeneous the result is devastating.

Healing Brush in inhomogeneous area
Healing Brush in inhomogeneous area

Clone Stamp

Clone stamp is a really important tool for repairing larger damages. It allows copying intact parts of the image into damaged areas. This tool is often used to reconstruct missing parts within an image.

Before Clone Stamp
Before Clone Stamp
After Clone Stamp
After Clone Stamp

Quick Selection Tool

The quick selection tool allows us to select pixels in a specific color range. It's often used to select objects or backgrounds. The tool works by calculating the difference from the current to the next pixel. If the next pixel's color/value lies within the set tolerance it will also be selected.

After Quick Selection
After Quick Selection

Curves

Almost all images have certain areas where contrast or color has faded. Curves enable us to darken or brighten certain ranges of pixels within the image. By doing so we can recreate the original color and brightness of the image. Curves even allow us to work in each of the color channels separately.

Curves tool
Curves tool

This is very important when neutralizing toning or color shifting. Understanding color theory is mandatory.

Before Curves
Before Curves
After Curves
After Curves

Layers

A key concept in photo editing is working with layers. Layers enable us to independently work on specific areas in a photo without altering the rest of the image.

Layers example 1
Layers example 1

In a typical setup, content is split across layers so we can reorder them—for example, if we moved the red layer above the green layer, the stacking order changes what you see in the composite.

Layers example 2
Layers example 2

The great advantage is that we can individually edit each of those layers without affecting the others.

Layers example 3
Layers example 3

When we move the red layer all the way up in the stack, the final image reflects that order and we can refine the result non-destructively.

Layers example 4
Layers example 4

Layer Masks

Layers would be nothing without layer masks. These masks allow us to partially blend out certain areas of a layer. Layer masks only work in the grayscale mode. White means the layer is fully visible, black means it is not visible at all. By using different shades of grey it is possible to gradually blend out the layer. The small square to its right indicates the mask. As the square is white, those areas of the layer show through fully.

Layer Masks 1
Layer Masks 1

If we paint a grey square onto our layer mask, blending out parts of the layer becomes gradual rather than abrupt.

Layer Masks 2
Layer Masks 2

We can further darken the grey square to increase how much of the layer is hidden in that region.

Layer Masks 3
Layer Masks 3

When we've turned the grey square within the layer mask to 100% black, that region of the layer is completely hidden.

Layer Masks 4
Layer Masks 4

Using them all together

These are just five basic tools used for restoring photos. The key is to know what to use when. Restoring water damaged photographs is fundamentally different than merging torn pieces or reviving faded colors. Photo restoration really is the champions league of photo editing.

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