How to Edit Any Video with AI Using Just a Reference Photo

You filmed something, and it’s almost right. Wrong outfit, flat lighting, a background you wish you’d chosen differently, or a product that needs to look different in every shot. In the old world, “almost right” meant reshooting. In 2026, it usually just means showing an AI what you want instead of the thing you have.

This week’s biggest AI story is Runway’s Aleph 2.0, a new kind of video tool that doesn’t generate clips from scratch — it edits the footage you already have, guided by a single reference image. Here’s what that means and how you can try it today, even if you’ve never edited a video in your life.

What Is This, Really?

Most “AI video” tools you’ve heard of — Sora, Veo, Runway’s earlier models — generate a brand-new video from a text prompt. You type “a golden retriever running on a beach,” and the AI invents footage that never existed.

In-context video editing is different. You start with a real video you already filmed, and the AI changes something about it while keeping everything else — the motion, the framing, the people — exactly the same. You can swap someone’s jacket, change day to night, restyle a room, or remove an object, all without reshooting a single frame.

The “reference image” part is what makes it precise. Instead of just describing the change in words (“make the jacket red”), you can hand the AI a photo showing exactly the red you mean. The tool locks onto that as a visual target, called a frame anchor, and carries the look through your entire clip.

How Does It Work?

Think of it like a photo restorer working on a damaged family video, except instead of restoring it, they’re repainting it to your instructions — frame by frame, but keeping every movement identical to the original.

You give the AI three things: the original video, a plain-language description of the change, and (optionally) a reference photo showing what the result should look like. The AI studies the whole clip first, understands what’s the subject, what’s the background, and what’s just lighting, then repaints only what you asked it to change. If your video has multiple cuts or angles, it recognizes when the same subject reappears and keeps the edit consistent across all of them.

How to Try It Yourself

You don’t need any editing software or technical skill to test this out. Here’s a simple first project using Runway, the tool behind Aleph 2.0.

Go to runwayml.com and sign up for a free account. New accounts get a one-time batch of free credits — no credit card needed.

Upload a short video clip (10–15 seconds is plenty for your first try). A clip of yourself talking, walking, or a simple product shot works well.

Look for the video editing tool (sometimes labeled “Edit Studio” or similar inside the product) and select your uploaded clip.

Write a plain-language instruction for your edit, e.g., “change my shirt to navy blue” or “make the background a cozy coffee shop.”

Optional: upload a reference photo showing the exact color, style, or background you want. This gives the AI something specific to match, instead of guessing.

Generate a preview, watch it render, and download the result once you’re happy with it.

Free-tier videos come with a small watermark, which is a fair trade for testing the tool before you decide if it’s worth paying for.

Tips to Get Better Results

Start with a short, simple clip. Ten to fifteen seconds with one clear subject is much easier for the AI to edit well than a long, busy scene.

Be specific in your instruction. “Change the lighting” is vague. “Make the lighting look like golden hour sunset” gives the AI something concrete to aim for.

Use a reference photo whenever color or style matters. If you have a brand color, a specific outfit, or a particular mood in mind, a reference image will get you there far more reliably than words alone.

Keep your subject well-lit and clearly visible in the original footage. The AI works best when it can clearly tell what’s foreground and what’s background — murky or dark footage gives it less to work with.

Expect to iterate. Your first result probably won’t be perfect. Treat it like a conversation: watch the output, adjust your instruction or swap the reference photo, and regenerate. Most people land on a result they like within two or three tries.

Closing Thought

You don’t need a film crew, a reshoot, or years of editing experience to change how a video looks anymore — you just need a clip you already have and a clear idea of what you want it to become. Pick one video sitting on your phone right now, upload it to a free AI video editor, and try changing just one thing about it. That one small experiment is the fastest way to understand what this new generation of tools can actually do.