u/RWJemmett

Have you ever wondered how your street looked in the past? Or what the view from your local park looked like before the houses were built?

GhostViewer lets anyone in the UK find a historic photograph of a nearby location, stand in the same spot today, and create a then-and-now comparison showing how the scene has changed. The whole process takes around thirty minutes the first time — and you don’t need any specialist photography skills or software.

Here’s how to get started.

https://ghostviewer.co.uk/features/how-to-create-your-first-then-and-now-with-ghostviewer/

I have a create a page of 'Then and Now' animated gifs for Berkshire - you can see through time

https://ghostviewer.co.uk/location/berkshire/?gv_view=creations

You can read t as a blog pots here: -

https://ghostviewer.co.uk/features/rephotography-alignment-guide/

# The Rephotographer's Toolkit: How to Align Then and Now Photos (And Why Your Approach Matters)

So you've found an old photograph — a Victorian street scene, a wartime postcard, a faded Edwardian portrait of a town square. You want to stand in the same spot today and recreate it. The concept is simple. The execution is where things get interesting.

Getting the alignment right is the difference between a striking "then and now" comparison and a slightly disappointing near-miss. Over the years, rephotographers have developed a range of approaches — from the reassuringly low-tech to the surprisingly sophisticated. Here's an honest look at the options, what each one is good at, and where each falls short.

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## The Classic Approach: Print It and Hold It Up

The oldest and most instinctive approach is also the one that photographs beautifully. You print the historic image, walk to the approximate location, hold it up in front of the scene, and move around until things line up.

This technique has a genuine romantic quality — images of a hand holding a sepia print against a modern street are some of the most evocative rephotography you'll find. Flickr user Jason E. Powell popularised the style in the 2000s, and it has inspired countless imitations. There's something powerful about the physical juxtaposition: the white-framed faded print sharply contrasted against the vivid present.

**The limitations are real, though.** You are relying entirely on your eye. Even small misalignments in camera height, angle, or distance compound quickly, and you won't know how well you've done until you get home and compare the images on screen. In changed or partially demolished scenes, it can be genuinely hard to find the right viewpoint without fixed anchor points to guide you. And you need to have the print with you — which means knowing in advance exactly where you're going.

**Best for:** casual rephotography, artistic "hand-held" style images, locations where you already know the exact spot.

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## Overlay Apps: OverCam and Similar Tools

The smartphone era brought a more precise version of the same idea. Apps like OverCam place a reference photo as a semi-transparent "ghost" directly over your phone's live camera feed, so you can see both the historic image and the present scene simultaneously as you move into position.

OverCam describes this as an "onion skin" technique borrowed from animation — the same principle used when hand-drawing frames over each other. You load your reference image, adjust the opacity of the overlay, and physically move until the anchor points in the historic image line up with what you see through the lens.

**This is a genuine improvement** over the printed photo approach — you're seeing both images at the same time rather than alternating between looking at a print and looking at the scene. It works well for straightforward locations where the scene hasn't changed dramatically.

**The limitations:** OverCam is a general-purpose composition tool, not a rephotography-specific platform. Its overlay feature hits a paywall quickly — users report being able to take only one aligned shot before being prompted to subscribe. It has no map, no database of historic images, no way to discover locations — you need to have already found your photograph before you open the app. It is also iOS-only in its current form, and reviews note it struggles with landscape orientation and different aspect ratios between the reference image and the camera.

Crucially, overlay apps help you **frame** the modern shot. They do not warp the historic photograph onto your new image or export a polished then-and-now comparison for you. That step still happens elsewhere — or not at all.

**Best for:** photographers who have already sourced their historic images and want a digital overlay tool for in-field framing.

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## Theodolite-Style Apps: Precision Navigation Tools

Theodolite is one of the App Store's oldest augmented reality apps, dating back to 2009. It overlays compass bearings, GPS coordinates, altitude, inclination angles, and rangefinder data directly on your live camera view — a digital version of the surveying instrument that has been used since the 18th century.

Rephotographers sometimes use Theodolite-style apps to record the precise bearing, elevation angle, and GPS position of an original viewpoint — data that can then be used to return to exactly the same spot under the same conditions. If a scientific rephotography project requires that a glacier be photographed from an identical position every five years, this kind of precision matters enormously.

**The limitations for casual rephotography are significant.** Theodolite was designed for surveyors, engineers, geologists, and search and rescue teams — not for someone trying to recreate a Victorian street photograph on a Saturday afternoon. There is no historic image overlay. The interface is dense with technical data. You would need to separately find, store, and mentally compare the historic image while navigating all of this. It is a powerful precision instrument applied to a problem that usually calls for something much more intuitive.

**Best for:** scientific or long-term repeat photography projects where exact coordinate data needs to be recorded and replicated.

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## Desktop Software: Photoshop and Post-Processing

The other major category is what happens after you get home. Photoshop's Auto-Align Layers, Perspective Warp, and Puppet Warp tools allow you to take two images shot from approximately the right position and algorithmically push them into better alignment afterwards.

This approach has real power. If you couldn't quite nail the vantage point in the field, or if the historic image has significant lens distortion compared to your modern camera, post-processing can compensate. Perspective Warp can account for the difference in field of view between a Victorian plate camera and a modern lens. Puppet Warp can pin specific anchor points — a doorframe, a roofline — and drag them into alignment.

**The trade-offs are real.** The more correction required, the more the image quality can suffer. Photoshop is expensive, requires a subscription, demands meaningful technical skill, and is desktop-only software — the opposite of something you can use while standing on a street corner. It also assumes you have already sourced both photographs and done the fieldwork without built-in discovery tools.

For users of Affinity Photo (a one-off purchase alternative), similar warp tools are available. GIMP offers a free open-source option, though the workflow is less polished.

**Best for:** refining images that are already close to aligned, or compensating for unavoidable lens differences — especially when you need maximum control over a single finished still.

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## GhostViewer: Discovery, Field Framing, and Geometric Alignment

[GhostViewer](https://app.ghostviewer.co.uk/) is a free browser-based web app for UK rephotography — nothing to install, and it works on any device with a modern browser, including your phone in the field. What sets it apart is that it treats rephotography as a **linked workflow** rather than a single trick: find a source image, get close in the field, align the two photographs geometrically, and export a shareable result.

GhostViewer is not one monolithic app on a single URL. The **[Historic Photo Map](https://ghostviewer.co.uk/map)\*\* lives on ghostviewer.co.uk; the alignment tool runs at **app.ghostviewer.co.uk**. They are designed to work together — open the map to browse, then jump into the app to build your comparison — but it is worth knowing they are separate surfaces linked by design.

### Discovery: find subjects you didn't know existed

Most tools in this list assume you have already done the archival legwork. GhostViewer starts earlier.

- **Historic Photo Map** — Browse geo-located historic photographs from the GhostViewer archive across the UK, filter by place, and open individual images with location context. The map also offers historic base layers (for example, a WWII-era view of Britain) to help you understand how a place has changed.

- **Geograph search in the app** — Search by place name or "near me", filter by year, and pull historic images from Geograph and the GV archive without leaving the alignment workflow.

- **Upload your own** — If you already have a scan, postcard, or family photograph, you can start from a file as well.

This discovery layer is UK-focused (Geograph and the GV map are built around British locations), which suits local history, heritage walks, and family projects rooted in the UK.

### Field framing: Ghost Guide Camera

Once you have an old photograph loaded, **Ghost Guide Camera** places it as a semi-transparent ghost over your phone's live camera feed — the same onion-skin idea as OverCam, but built into a rephotography workflow rather than a general composition app.

You can fade the ghost opacity, drag and pinch to reposition it, and choose **Contain** (see the full historic image) or **Cover** (fill the viewfinder, cropping if needed). When you are happy with the framing, capture the modern photograph and it drops straight into the alignment steps.

**Important:** Ghost Guide helps you match the **viewpoint and composition** in the field. It does not produce the final aligned overlay on its own. Think of it as getting you close before the precise work begins.

### Precise alignment: landmark matching and perspective modes

This is the step that separates GhostViewer from a simple overlay app — and it overlaps with what desktop tools like Photoshop do, but in a purpose-built, guided interface.

You place **matching landmark pairs** on both images: a church tower corner on the old photo and the same corner on the new one, and so on. You need at least four pairs; six to eight well-spread points across the frame usually give a stronger result. A live low-resolution preview updates as you work.

GhostViewer then **warps** the old photograph to fit the new one. You choose how much geometric freedom to allow:

| Mode | What it does | When to use |

|------|----------------|-------------|

| **Similarity** | Shift, rotate, and scale uniformly — no skew or perspective | Best first choice for most same-place comparisons |

| **Affine** | Adds shear — handles tilted scans or a slight "lean" between images | When Similarity leaves edges drifting |

| **Perspective** | Full perspective correction — parallel lines can converge | Stronger viewpoint changes; needs good point spread |

The app reports alignment quality (per-point error and an overall score) so you can see whether to adjust landmarks or try a different mode. You can crop, straighten, and fine-tune the result before export.

Alignment is **manual**, not automatic. Heavily changed or demolished scenes are still difficult — no tool removes the need for judgement — but the warp gives you a proper geometric match rather than two photographs merely placed side by side.

### Export: shareable then-and-now outputs

After alignment, GhostViewer is built for output: opacity blend, swipe reveal, and flicker comparison in the app; then export as a still image, animated GIF, or video — including optional multi-stage transitions that isolate structural change from colour change over time. Captions, framing presets, and crop-to-overlap help you produce something ready for a blog post or social feed.

The core app is free to use. An optional free account lets you save projects and unlock cleaner exports (for example, removing the watermark and video end screen). You do not need an account to get started.

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## Which Approach Is Right for You?

| Approach | Discovery | Field framing | Geometric alignment | Export (GIF/video) | Cost | Skill required |

|---|---|---|---|---|---|---|

| Printed photo | ❌ You source it | ✅ Visual, approximate | ❌ | ❌ | Print costs | Low |

| OverCam | ❌ You source it | ✅ Digital overlay | ❌ | ❌ | Free trial, then subscription | Low–Medium |

| Theodolite | ❌ You source it | ⚠️ Bearing/GPS data only | ❌ | ❌ | Paid app | High |

| Photoshop | ❌ You source it | ❌ | ✅ Post-processing warp | ✅ Still-focused | Subscription | High |

| GhostViewer | ✅ Map + Geograph | ✅ Ghost Guide Camera | ✅ Landmark warp (3 modes) | ✅ Still, GIF, video | Free (optional account) | Low–Medium |

**If you already have a historic image** and mainly need help framing the modern shot in the field, a dedicated overlay app such as OverCam can do that job well.

**If your project needs scientific-grade coordinate logging** over many years, Theodolite-style apps still have a place.

**If you want maximum post-processing control** on a single finished still and already work in desktop software, Photoshop (or Affinity Photo / GIMP) remains the most powerful option.

**If you want a UK-focused workflow** that connects discovery, in-field framing, geometric alignment, and export — without installing software or paying a subscription — GhostViewer is one of the few platforms built specifically for that path from start to finish.

**[Explore the GhostViewer Historic Photo Map →](https://ghostviewer.co.uk/map)\*\*

**[Open the GhostViewer alignment app →](https://app.ghostviewer.co.uk/)\*\*