Color Afterimage Illusion Generator
Stare at the ✕ in the center for a few dozen seconds, then the image switches to black and white and you see color: the “negative afterimage” illusion. Use the sample image or upload your own photo to make your own illusion.
This is a color preview. When you press Start, it changes to a color-inverted image — keep your eyes on the × in the center.
Staring time
The longer you stare, the stronger the afterimage. Go shorter when your eyes are tired.
A more saturated inverted image gives a clearer afterimage, but is harder to stare at.
All image conversion happens in your browser and nothing is sent to a server. You can also drag and drop to replace the image.
Why do you see color?
- 1. When you keep looking at the inverted image (a green pig, a pink frog), the cone cells that respond to those colors get tired and less sensitive.
- 2. When it switches to black and white, the cells that aren’t tired respond relatively more strongly, so the colors before inversion — the original colors — appear.
- 3. Moving your eyes shifts the afterimage away, so the trick is to keep staring at the ✕ for a few seconds after the switch.
ABOUT
About Color Afterimage Illusion Generator
The Color Afterimage Illusion Generator lets you experience the “negative afterimage”: stare at the center of a color-inverted image for a few dozen seconds, then switch to black and white, and the black-and-white image appears to be in color. Besides the sample image, you can load your own photos or illustrations and the inverted and black-and-white images are made automatically.
How to use Color Afterimage Illusion Generator
- 1Use the sample image, or load a photo or illustration with “Try your own image”
- 2Adjust the staring time (10–45 seconds) and the “color strength”
- 3Keep your eyes on the ✕ in the center and stare at the inverted image
- 4Keep looking at the ✕ for a few seconds after it switches — the black-and-white image looks colored
- 5Download an inverted image you like as a PNG with “Save inverted image”
Great for
- Try the strange experience of seeing color in a black-and-white image
- Make your own illusion from photos or illustrations you made
- Explain how the eye works (complementary afterimages) in a school project or class
- Save the inverted image and share it as an illusion on social media or in slides
- Compare how strongly friends and family see the colors
Good to know
- For the effect, keep your eyes on the ✕ in the center for a few seconds after the switch. Moving your eyes shifts the afterimage and it fades.
- Choose a staring time from 10 to 45 seconds. Longer gives a stronger afterimage, but go shorter if your eyes are tired.
- Raising the “color strength” makes the inverted image more saturated and the afterimage clearer. Lower it if it feels too bright.
- Vivid images with large areas of color give clearer afterimages. Dark photos or images with few colors have a weaker effect.
- How you see afterimages varies from person to person. Not seeing them at all is nothing to worry about.
- Images are loaded and converted entirely in your browser and never sent to a server.
- If your eyes feel strange or hurt, stop right away and rest them. People sensitive to flashing light should avoid using it.
Questions this tool answers
Use Color Afterimage Illusion Generator for searches like these:
- try the illusion where black and white looks colored
- play with optical illusion images
- make an illusion from my own photo
- explain complementary afterimages for a school project
- an image that shows color when you stare at it
FAQ
- Why do I see color in a black-and-white image?
- The cone cells in your eyes that sense color get tired and less sensitive when they keep seeing the same color. A part that stared at green becomes less sensitive to green, so when you then look at gray (all colors equally), the opposite color, pink, feels relatively stronger. That is why the original colors seem to appear — it is called a negative or complementary afterimage.
- How long should I stare?
- About 20 seconds is a good guide. Even 10 seconds works, but 30–45 seconds gives a more vivid afterimage. It switches to black and white automatically when time is up, or you can tap the screen to switch earlier.
- Can I use my own photo?
- Yes. Choose an image with “Try your own image” or drag and drop it onto the display area, and the inverted and black-and-white images are made automatically. Images where vivid colors like pink or green cover a large area give the clearest illusion.
- Can I save the inverted image?
- Yes. Download it as a PNG with the “Save inverted image” button to post on social media or paste into documents.
- What if I can’t see the colors well?
- Try staring longer, raising the “color strength”, making the screen brighter, or going full screen to make the image larger. Moving your eyes after the switch makes the afterimage disappear, so blink as little as possible and keep looking at the ✕.
- Is it bad for my eyes?
- Afterimages are temporary and fade naturally within a few dozen seconds. Staring at a screen for a long time does tire your eyes, so don’t repeat it many times in a row, and rest your eyes by looking into the distance in between. Stop if anything feels wrong.
Special Thanks