When AI colorizes a black-and-white photo, are the colors real?
TimeMend editors ·
Colorizing black-and-white photos is one of the things people most want to do when restoring old photos. Seeing an older relative's younger self in color can be genuinely moving. But before you share it, it's worth knowing where those colors come from.
How AI colorizes a black-and-white photo
A black-and-white photo records light and dark, not color. The same shade of gray could be red, green or blue.
AI colorization models learn from huge numbers of color photos which colors certain things usually are, then apply those patterns to black-and-white photos. So what they produce are plausible colors, not the colors as they were.
Which colors are fairly reliable
| What's in the picture | Reliability | Why |
|---|---|---|
| Sky, grass, trees | Higher | Their colors follow stable patterns |
| Skin | Medium | May come out too red or too yellow |
| Clothes, scarves, fabric | Lower | The same gray could be any color |
| Cars, furniture, walls | Lower | Depends on the era and region; models often guess wrong |
| Uniforms, badges, flags | Low | These are historical facts; don't rely on AI |
Before and after colorizing
- Restore first, then colorize: scratches and stains interfere with judging color.
- Ask older relatives what they remember: if someone remembers the color of the clothes or the house, go with their memory.
- Label it for historical, memorial or published use: for example, "Colorized by AI; colors are estimated."
- Keep the black-and-white original: the colorized version is an addition, not a replacement.
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