Why AI manga colors change from page to page

AI colorized manga changes colors between pages because most colorizers predict each page on its own. The model has no memory of the last page, so a character's hair or clothes can come out as a different shade each time. Hints, reference pictures and processing pages together reduce the drift, but they do not remove it.

Why it happens

• Each page is a new prediction. The model sees one page at a time and makes a fresh guess for every region.
• Black-and-white gives few clues. A grayscale shade of hair could be many real colors, and the model picks a likely one.
• Small changes in input change the guess. A different pose, angle or crop can flip the choice.
• Lighting and mood. A model may paint the same coat in different tones to suit a scene.
• There is no character list. Unless it is told, the model does not know that two drawings are the same person.

Where you notice it

• Hair color changing from one panel to the next.
• Clothes in a new shade after a scene change.
• Skin tone drifting between pages.
• Backgrounds with different palettes on neighboring pages.

Ways to keep colors consistent

1. Use a reference. Give the colorizer a colored picture of each main character, if the tool supports it.
2. Add hints. Place a few color strokes on hair, skin and clothes in the first page, and repeat the same colors.
3. Process a chapter together. Handling pages in one batch with the same settings can help more than coloring them one at a time.
4. Keep the input consistent. Use scans of the same size and quality for every page.
5. Fix the worst pages by hand. A few edits in a drawing program are faster than redoing the chapter.
6. Write down the palette. A short list of character colors makes it easy to spot a mistake.

Reference-guided versus automatic

An automatic colorizer decides everything. A reference-guided one tries to match your example, which narrows the guesses and helps hair and outfit colors stay the same. It cannot guarantee a perfect match, because the shapes on each page are different.

Why translation order matters

If you also translate the pages, do the text first. Removing and rebuilding the lettering before colorizing means the model colors a clean page. Typesetting the translation last keeps the letters crisp and keeps their color from changing from page to page. This is the order RuneManga plans for translate + colorize.

A simple consistency test

1. Pick the two pages where the same character looks the most different.
2. Compare hair, eyes, skin and the main outfit side by side.
3. Note which colors differ and whether a hint or reference would fix them.
4. Fix those pages first, because readers notice a main character changing more than a background.

Official color editions versus AI coloring

An official color edition is planned by the artist or a colorist, who keeps a palette for every character from the first page to the last. An automatic colorizer has no such plan unless you give it one. That difference is the reason drift is a well-known limit of AI colorizing.

What to expect

Expect a good first pass and a few corrections. Treat automatic color as a reading aid or a starting point, not as a finished color edition.

Questions

• How does AI colorize manga? A plain explainer
• How to colorize manga: by hand and with AI
• Translate, colorize or both: which mode to pick
• Colorize manga with RuneManga (planned)