How to Upscale Anime Art, Wallpapers and Manga Scans

Anime and illustration are the best case for AI upscaling. Not because the networks were built for them, but because the material is friendly: hard outlines, large areas of one colour, almost no texture. Most of the disappointment we see with anime comes from three avoidable decisions, not from the engine.

Why line art survives upscaling

A drawing is mostly two values — outline and fill — so there is very little to get wrong. A photograph asks the model to invent skin, hair, foliage and fabric; a drawing asks it to keep a line a line. We can usually do that at 4x without the result looking synthetic.

What actually damages an anime image is everything around the drawing: anti-aliasing from the original export, JPEG artefacts from wherever you downloaded it, and an extra round of resizing by whatever app you last opened it in. Those soften the outline before it reaches us, and a soft outline gets smoothed further instead of being rebuilt.

What size do you actually need?

Work out the target first, then pick the factor. That is the whole trick — decide by output pixels, not by how impressive the multiplier sounds.

If you only need 1.3x, do not run 4x and shrink it afterwards. Run 2x on the original, then downscale the result to the exact target — or keep the extra pixels for cropping.

Manga scans are a different problem

A scan is not clean line art. It has screentone dots, paper grain, ink bleed and usually JPEG blocking from the scanner software. Two things go wrong if you treat it like a digital drawing:

• Screentone becomes moiré. Halftone dots are a texture, and a super-resolution model is very good at making textures sharper. Push 4x on a dotted area and you get louder dots, sometimes with visible interference patterns. For halftone pages, 2x with low noise reduction stays closest to the original.
• Paper grain gets enhanced too. The model cannot tell paper from subject. Low or medium noise reduction is the right range; the highest setting erases the ink texture along with the grain and can make lines wobble.

For a scan, start with the art model, low noise reduction and 2x. If the page is mostly line art with little tone, 4x is fine. If it is dense screentone, upscaling helps less than re-scanning at a higher DPI.

Settings for anime, in one list

• Model: the art/illustration one. This is the single most common mistake we see — anime art run through the photo model comes back with softer lines and texture on areas that were flat.
• Noise reduction: low, or medium for a JPEG that has visible blocks. Highest belongs to drawings and old scans only, and even there it is a last resort.
• Factor: 2x or 4x. Go higher only for a genuinely tiny source, like a 200-pixel sprite or a sticker.
• Format: keep PNG for anything with flat colour, hard edges or transparency. A PNG screenshot saved as JPEG loses exactly the sharpness you are trying to preserve.
• Never chain: one pass at the factor you need beats 2x followed by 2x.

Three mistakes we see every week

Photo model on line art. The result is not ruined, it is just softer than it should be, and people conclude the tool is bad. 16x on a clean wallpaper. Nothing in a 1920×1080 wallpaper needs 16x; you get four times the file size and invented detail that shows at 100 %. Upscaling a screenshot of a drawing. Screenshots add their own resampling and compression; if the original file exists somewhere, use it.

Try it on your own artwork: enlarge an image free up to 3000×3000 pixels without an account, or use the factor guide to pick the multiplier, and the print size table if the goal is paper.