How to make the Scanimation (Animated optical illusions)

This section describes how to make Scanimation (Animated optical illusions).

Do you know the mechanism of Scanimation (Animated optical illusions)? If you don't know please check this page first.( Why does Scanimation (Animated optical illusions) move? )

Scanimation (Animated optical illusions) demonstration

Let's make a slit-sheet

There are two functions of the brain that necessary for Scanimation (Animated optical illusions).

Let's make two frames Scanimation (Animated optical illusions) with two illustrations.Two frames "Scanimation (Animated optical illusions)" needs the slit-sheet that have the black and transparency stripes pattern of same strength stripes.

For example when setting a black stripe to 5mm,a black stripe and a transparency stripe appears every 5mm.

The appropriate width of the stripes depends on the illustrations.You have to change the width of stripes with a complicated illustration and a simple illustration.

The illustration hidden at the slit-sheet must have continuity.The narrow stripe of slit-sheet makes easy to recognize an illustration.

But the narrow stripe of slit-sheet makes an animation fast.With the slit-sheet of 5mm of intervals,you must move the slit-sheet 5mm aside to change frame.

With the slit-sheet of 1mm of intervals,you only move the slit-sheet 1mm aside to change frame.

slit-sheet image

The animation fast makes hard to see it.That isn't good as "Scanimation (Animated optical illusions)".

The narrow stripe makes it difficult to recognize the illustrations.And narrow stripe makes slow switching of a frame,so it becomes hard to feel movement.

The too narrow or too wide stripes are not good as "Scanimation (Animated optical illusions)".You must make a slit-sheet most suitable stripes width and number of frames.Let's try many stripes width.

How to make the Scanimation (Animated optical illusions) 2

- let's make the base illustration -

Well,let's make the base illustration.Put the slit-sheet on the first frame's illustration. The illustration which is showing from the transparent area of the slit-sheet is necessary for first frame.Let's pick this out.

first frame of animated optical illusion image

Using image editing software like "Photoshop" or "Illustrator",you can do this easily.

To make it easy to understand,first frame's illustration color is red,and second frame's illustration color is blue. When you actually make Scanimation (Animated optical illusions),the illustrations will have better single color. It is better that we recognize the illustrations that the same thing by the brain function.

First frame of illustration was made.This time,let's make second frame's Scanimation (Animated optical illusions).So only this knows what is drawn somehow, doesn't it?It is an illustration using the function of brain that if even a condition gathers, brain supplements a secret part with a slit-sheet.So we create an illustration without the hidden parts.

Let's put a slit-sheet over this illustration.Please click the illustrations.A ball and man should now appear.

second frame of Scanimation (Animated optical illusions) image

Please move a slit sheet aside.A ball and man disappeared and has become only the slit sheet. It's natural,isn't it?Because it's the illustration from which the part where not painted anything. We make second frame's illustration where the part seen during a slit.

Let's create the illustration of second frame in the same procedure as first frame illustration. Put slit-sheet on the second frame's illustration.You moves aside the slit-sheet by width of the slit. For example,only 5 mm move aside the whole slit-sheet when you make width of the slit 5mm.

The illustration which is showing from the transparent area of the slit-sheet is necessary for second frame.Let's pick this out.

demonstration of first frame Scanimation (Animated optical illusions) base image
demonstration of first frame Scanimation (Animated optical illusions) slit-sheet

Finally the combined first-frame illustrations and illustrations in the second frame. Only a striped margin slips exactly, so the picture is made without overlapping each other. We have made the base illustration.

Click the right illustration, a slit-seat comes out.

demonstration of all frames Scanimation (Animated optical illusions) base image
demonstration of all frames Scanimation (Animated optical illusions) slit-sheet

Please move a slit-sheet slowly aside. first frame illustration and second frame illustrations are displayed alternately. When a slit-seat is moved fast, the illustrations should animate. Two frame's Scanimation (Animated optical illusions) has completed it.

Relation between the number of frames and a slit-seat

How to make a three frame's Scanimation (Animated optical illusions)

Three frame's Scanimation (Animated optical illusions) needs the slit-sheet that have the black and transparency width of ratio is 1 to 2.Because when you can see the first frame of illustration, it must cover 2nd and 3rd frames of illustration.

For example when setting a black stripe to 5mm,a transparency stripe have 10mm.

three frames of slit-sheet

And it needs three illustrations.

Ready to slit sheets and illustrations,in the same steps as when you made two frames "Scanimation (Animated optical illusions)" creates the base illustrations.