DUOTONE

Apply duotone effects to images using GPU acceleration. Thanks to the use of Metal it's on average 75 times faster than the original Python version.

Install

git clone git@github.com:carloe/duotone-swift.git
cd duotone
swift package update
swift build -c release
cp -f .build/release/duotone /usr/local/bin/duotone
duotone --help

Usage

Duotone individual files or batch process entire folders.

# Single Image...
duotone input.jpg --light '#FFCB00' --dark '#38046C' --out output.png

# Batch processing...
duotone ~/images --light '#FFCB00' --dark '#38046C' --out ~/images/out

Presets

Settings can be saved as preset so they can be reused without having to juggle or memorize hex colors.

# List all presets
duotone list

# Add a new preset named 'foo'
duotone add --preset foo --light '#FFCB00' --dark '#38046C' --contrast 0.5 --blend 0.5

# Remove the preset named foo
duotone remove --preset foo

# Apply the preset 'foo' to 'file.jpg'
duotone file.jpg --preset foo --out result.jpg

Presets are saved as JSON, and can also be eddited directly.

vim ~/.duotone

[
  {
    "blend" : 1,
    "light" : "#444644",
    "dark" : "#1e201e",
    "contrast" : 0.5,
    "name" : "spacegray"
  }
]

License

MIT