Why You Can’t Just Hit “Print at 10,000%”

Last time, in Understanding Wall Mural Image Resolution, we set out the basics:

1. How many pixels are in the original image?
2. What is the desired output size?
3. What is the viewing distance?

Those three things decide whether a mural graphic will look good — or like a picture you accidentally took pulling your iPhone out of your pocket in a taxi.

But if an image looks sharp on a laptop screen, why can’t we just hit “print at 10,000%”?

Rasterized images don’t work like that. You can’t just stretch them. They’re made up of fixed pixels—tiny squares of information captured when the image was made or converted.

When you enlarge the image, the pixels get bigger too. Image software often automatically makes new pixels when enlarging. But at very large sizes, that fails too, and things start to look bad wherever people expect sharpness and details: faces, text, fine patterns.

Yes, AI tools and plugins are better than the old defaults. But they’re still just guessing. Even with those, at some point, you can tell.

Here’s the thing:

Enlarging an image doesn’t just make the original bigger. It also makes the original's limitations even clearer.

What to do?

Glad you asked. Next time: a time-tested answer.

Warmly,
Jonathan

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MtM Word of the Day:
Rasterize. To digitally convert artwork, text, or other graphics into a fixed grid of pixels at a specific resolution. After rasterization, the image has a fixed size and a specific number of pixels per inch (PPI). Enlarging a rasterized image too much can make the pixels visible to the naked eye, which can appear unpleasant or cheap.