The Easy Way to Colourise Your Photos

Colourising black and white photographs is usually presented as either a painstaking hand-tinting exercise or a job for modern AI. Both approaches can work, but there is a simpler and more controllable method if you are able to take a colour reference photograph at the same time as your film shot.

The basic idea is straightforward: make a black and white film photograph in the usual way, but also take a matching digital colour photograph from the same viewpoint. The digital image supplies the colour information, while the film negative or print supplies the character, grain, tonality, and resolution of the final image.

This is not a method for guessing historical colour. It is a way of recording real colour at the time of shooting, then applying it to a monochrome film photograph afterwards.

Taking the Matching Colour Photograph

The most important part of the process happens before you get to Photoshop. You need a colour photograph that matches the film photograph as closely as possible.

One easy way to do this is to use a viewfinder app, such as FinderView, on a phone. This lets you preview different lens fields of view and compose the digital reference image to match the camera you are using. The colour photograph does not need to be technically perfect, but it does need to match the framing, perspective, and lighting of the film image as closely as you can manage.

Ideally, take the digital colour photograph immediately before or after the film exposure. This keeps the light consistent and avoids changes in shadows, reflections, facial expressions, or moving objects.

For still life, architecture, portraits, or landscape work, this can be surprisingly easy. A tripod helps, but is not essential. The better the match between the two images, the easier the colourising stage will be.

Scanning the Film Image

Once the black and white film has been developed, scan the negative or print as you normally would. Open the scan in Photoshop and make your usual tonal adjustments first. Dust spotting, contrast, cropping, and basic exposure correction are best done before adding colour.

At this stage, the film image should already work as a finished black and white photograph. The colour layer should enhance it, not rescue it.

Aligning the Two Images

Open the digital colour photograph in the same Photoshop document as the scanned film image. Place it above the black and white layer and reduce its opacity so that you can see both images at once.

Use Free Transform, Warp, Perspective, or Distort to align the digital colour image with the film scan. This is usually the most time-consuming part of the process. The two images may not match perfectly, especially if they were taken with different lenses or from slightly different positions, but they do not need to be absolutely identical. A close visual match is usually enough.

Pay particular attention to edges, eyes in portraits, strong architectural lines, horizons, and high-contrast details. These are the places where misalignment will be most obvious.

When the match is good, return the colour layer to full opacity.

Extracting the Colour

There are several ways to separate the colour information from the digital photograph. A simple Photoshop method is to duplicate the colour layer, convert the duplicate to monochrome, and then use the relationship between the colour version and the monochrome version to isolate the colour component.

In practice, you are trying to remove the brightness information from the digital photo while keeping its hue and saturation. The black and white film scan already contains the luminance, texture, and photographic structure. The digital layer only needs to contribute colour.

Another simple approach is to place the colour photograph above the film scan and change the blending mode to Color. This often gives a good starting point immediately. The opacity of the colour layer can then be adjusted until the result looks natural.

More controlled versions of the method can involve subtracting a monochrome copy from the colour image, using layer masks, or combining layers in different blending modes. The exact technique matters less than the principle: use the film image for tone and the digital image for colour.

Combining the Layers

Once the colour information has been isolated or blended, place it above the black and white film layer. Try blending modes such as Color, Soft Light, or Overlay, and adjust the opacity until the result feels convincing.

The temptation is to add too much colour. A lower opacity often looks more photographic. Film grain, lens rendering, and tonal contrast should remain visible. The colour should seem to belong to the film image rather than sitting on top of it.

Layer masks are useful for local corrections. Skin tones may need less saturation, skies may need more careful alignment, and small mismatches around edges can be painted out. If parts of the digital image do not align well, mask them away and allow the black and white film image to carry those areas on its own.

Why This Works

Traditional colourisation usually involves interpretation. You decide what colour something might have been, then paint or generate it. This method is different because the colour is recorded at the time. The digital image acts as a colour notebook for the film photograph.

The result can retain much of what people like about black and white film: the grain, highlight behaviour, shadows, lens signature, and tonal separation. At the same time, it gains a subtle layer of real-world colour.

This can be especially effective with old cameras, large negatives, unusual lenses, or historic processes. The final image is not simply a digital photograph made to look like film. It is a genuine film photograph with colour information borrowed from a companion digital exposure.

Practical Tips

Try to keep the camera position as similar as possible between the two shots. Even a small change in viewpoint can make alignment harder, particularly with nearby subjects.

Use the same or similar focal length if you can. A phone viewfinder app can help you match the field of view before taking the digital reference.

Avoid scenes with too much movement unless you are happy with a more impressionistic result. Leaves, water, crowds, and clouds may shift between exposures.

Keep the colour layer subtle. If the result looks too modern or too clean, reduce saturation or lower the layer opacity.

Do not worry if the match is imperfect. Slight irregularities can give the image a handmade quality, and the underlying film photograph will still provide the main structure.

A Useful Hybrid Technique

This method sits somewhere between analogue and digital photography. The black and white film photograph remains the foundation, but the digital reference image makes colourisation far easier and more faithful to the original scene.

For photographers who enjoy using older cameras but occasionally want colour results, it is a useful trick. You can expose your favourite black and white film, record a quick digital colour reference, and later combine the two into a photograph that has the feel of film and the colour of the original moment.

It is not the only way to colourise a photograph, but it may be one of the easiest and most natural.