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40 mins
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Teacher-led from the board. Pupils do not need a device, but can follow on one.

Spotting Image, Audio and Video Manipulation

Practise identifying whether digital images, audio clips and videos have been altered. Learn to tell the difference between ordinary edits for clarity and changes made to mislead viewers. Use simple checks to decide on a selection of media examples.

Teacher Class Feed

Load previous activity
    Your turn
    Your teacher is running this lesson on the board. Here is the part you can try yourself.
    Verdict reveal
    Class poll
    Independent practice

    1 - Start ~4 mins

    Illustration for StartYou already know how to crop, filter and trim photos and clips. Today you will look at media made by other people and try to tell what was done to it. A capture is the photo, clip or recording as it was first taken.

    Your callWhat it means
    As takenNo good reason to think the capture was changed.
    Fair editingChanged for clarity, length, framing, quality or privacy, without inventing a false story.
    Altered to misleadChanged so people believe something untrue.

    You will decide using tells, which are clues you can see or hear.

    2 - Examine and Discuss ~6 mins

    Two edits side by side. An ordinary edit, a crop: a photo of a football match is cropped so the goal and the diving goalkeeper fill the picture. A misleading edit, a cut: the sentence We are not closing the library loses the word not, and becomes We are closing the library.

    Photo on the left: "Goalie" by Bryan Gatchell, U.S. Army, public domain, via Wikimedia Commons.

    Not every change is a trick. A sports photographer who crops a photo so the goal fills the picture is making an ordinary edit. Manipulation means changing a photo, clip or recording. It becomes a problem when the change is hidden and makes you believe something untrue, such as a sentence cut from a speech so it means the opposite.

    You will choose from three verdicts, or decisions:

    • As taken: nothing important has been changed.
    • Fair editing: changes make it clearer, shorter, better framed or more private, and they do not tell a false story.
    • Altered to mislead: the change makes people believe something untrue.

    3 - Hands-on: Manipulation Forensics ~7 mins

    As a class, look at and listen to all three items below. Then work through Item 1 together in the activity underneath. Talk out loud about what changed and whether that change tells a false story, agree on one verdict, and then reveal the reasoning. After that, everyone votes on all three items in the class poll on the next step.

    Item 1: the parade photo

    Posted on a GAA club page

    “The teams parade before the final.”

    The photographer's originalThe posted version
    A wide view of Croke Park: the stands, the crowd and the two teams parading on the pitch before the 2009 All-Ireland hurling finalThe same photo, cropped close on the teams parading

    Item 2: the councillor clip

    Shared on a community page

    “Councillor on the youth club budget.” The post does not include the full, longer recording.

    Item 3: the snow video

    Reposted phone video

    “Blizzard batters Dublin as people fight their way home.”

    Leave the section under the video closed until your teacher opens it after the poll.

    Only after the class has called all three: the originals

    The councillor's full recording:

    The snow video as it was filmed, at normal speed with its real sound:

    The photos and the snow video are real. The captions, the posts and the councillor are made up for this lesson, and the councillor's voice is computer-generated.

    As taken, fair edit, or altered?

    4 - Class Poll: as Taken, Fair Editing, or Altered? ~7 mins

    Now everyone votes on every item on their own device. Round 1 is the item you just worked through together.

    How it works

    There is no score and no time limit. When the class has voted, the board shows how the class split, and then it shows the reasoning. After the discussion, your teacher can open the vote again to see if anyone has changed their mind.

    • Read the item and make your choice.
    • When the reasoning comes up, compare it with your own reason.
    Key point

    Being able to explain your choice matters more than getting it right, because the reasoning is what you are here to learn.

    Class Poll

    5 - Your Turn ~10 mins

    On your own or with a partner, judge these two items. Look at each picture before you read anything else, and then write three short lines about it. Under each photo, the table shows who posted it (the source) and the words that were posted with it (the caption).

    Item 1Item 2
    The stone pier at Loughshinny harbour, County Dublin, on a cloudy morning, with small boats moored on calm waterRed apples in a green crate at a market
    Source: a local photographer, named in the post
    Caption: “Quiet morning at the pier.”
    Source: shop’s own post
    Caption: “New batch in today. Crates full!”

    Click a photo to see it full size.

    For each item, write

    Verdict: as taken, fair editing, or altered to mislead.
    What may have changed?
    The one tell that decided it.

    Where to look

    In a real photo, no two things are ever exactly the same. So if you find two things that match in every detail, look again at both of them. Also check that light and shadows fall the same way across the whole picture, and that every reflection matches the thing it reflects.

    Before you finish, check that you have:

    • given a verdict for both items
    • named one clear tell for each item
    • explained, for at least one item, why it is as taken or fair editing rather than a lie

    When everyone has a verdict for both photos, open the answers below.

    Only after you have decided: how each photo was made

    Item 1, the harbour: as taken. This is a real photograph of the pier at Loughshinny, County Dublin, and nothing in it was changed. Nothing repeats, the light falls the same way on the pier, the water and the sky, and the caption says nothing the photo does not show.

    Item 2, the apples: altered to mislead. Two apples were copied and pasted into empty spaces in the crate, so it looks fuller than it is. The caption, “Crates full!”, is what the edit was for.

    The apples photo with the answer marked: two apples circled in red as copies, one at the top left and one near the bottom, and an arrow from the real apple with the eve sticker, on the right, to its copy.

    The clearest copy is the apple with the heart-shaped eve sticker. The real one is on the right of the crate. Its copy is near the bottom, a little smaller, with the sticker at exactly the same angle. No two real apples have the same shape, marks and shine.

    Close up, the real apple with the eve sticker beside its copy: the same shape, the same marks and the sticker at exactly the same angle.

    How to spot this next time
    • Look for two things that are exactly the same. In a real photo, no two things are.
    • Check that the light and the shadows agree across the whole picture.
    • Ask what the caption wants you to believe, and whether the edit is there to make you believe it.
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