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Colorizing black and white photos in (Gnu Image)

  • Make a gradient of dark blue and light blue
  • Colors > Map > Gradient
  • (NOTE you can also do this by Windows > Dockable dialogs > Palette, and drag over some colors dark to light, then do Map > Palette, which gives you a more rangy color effect)
  • (NOTE or you can do Colors > Colorize) THEN
  • r-click blue layer > Add layer mask > Black full transparency
  • Now you can use any tool (pen, airbrush, square and fill) and create that color

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