GO IMAGE FILTERING TOOLKIT (GIFT)

Package gift provides a set of useful image processing filters.

Pure Go. No external dependencies outside of the Go standard library.

BETA

INSTALLATION / UPDATING

go get -u github.com/disintegration/gift

DOCUMENTATION

http://godoc.org/github.com/disintegration/gift

QUICK START

// 1. Create a new GIFT and add some filters:
g := gift.New(
    gift.Resize(800, 0, gift.LanczosResampling),
    gift.UnsharpMask(1.0, 1.0, 0.0),
)

// 2. Create a new image of the corresponding size.
// dst is a new target image, src is the original image
dst := image.NewRGBA(g.Bounds(src.Bounds()))

// 3. Use Draw func to apply the filters to src and store the result in dst:
g.Draw(dst, src)

SUPPORTED FILTERS

Transformations
- Crop(rect image.Rectangle)
- FlipHorizontal()
- FlipVertical()
- Resize(width, height int, resampling Resampling)
- Rotate180()
- Rotate270()
- Rotate90()
- Transpose()
- Transverse()
Adjustments & effects
- Brightness(percentage float32)
- ColorspaceLinearToSRGB()
- ColorspaceSRGBToLinear()
- Contrast(percentage float32)
- Convolution(kernel []float32, normalize, alpha, abs bool, delta float32)
- Gamma(gamma float32)
- GaussianBlur(sigma float32)
- Grayscale()
- Hue(shift float32)
- Invert()
- Maximum(ksize int, disk bool)
- Mean(ksize int, disk bool)
- Median(ksize int, disk bool)
- Minimum(ksize int, disk bool)
- Saturation(percentage float32)
- Sepia()
- Sigmoid(midpoint, factor float32)
- UnsharpMask(sigma, amount, thresold float32)

FILTER EXAMPLES

Resize using lanczos resampling

gift.Resize(200, 0, gift.LanczosResampling)

Original image	Filtered image

Resize using linear resampling

gift.Resize(200, 0, gift.LinearResampling)

Original image	Filtered image

Crop 90, 90 - 250, 250

gift.Crop(image.Rect(90, 90, 250, 250))

Original image	Filtered image

Rotate 90 degrees

gift.Rotate90()

Original image	Filtered image

Rotate 180 degrees

gift.Rotate180()

Original image	Filtered image

Rotate 270 degrees

gift.Rotate270()

Original image	Filtered image

Flip horizontal

gift.FlipHorizontal()

Original image	Filtered image

Flip vertical

gift.FlipVertical()

Original image	Filtered image

Transpose

gift.Transpose()

Original image	Filtered image

Transverse

gift.Transverse()

Original image	Filtered image

Contrast +30%

gift.Contrast(30)

Original image	Filtered image

Contrast -30%

gift.Contrast(-30)

Original image	Filtered image

Brightness +30%

gift.Brightness(30)

Original image	Filtered image

Brightness -30%

gift.Brightness(-30)

Original image	Filtered image

Saturation +50%

gift.Saturation(50)

Original image	Filtered image

Saturation -50%

gift.Saturation(-50)

Original image	Filtered image

Hue +45

gift.Hue(45)

Original image	Filtered image

Hue -45

gift.Hue(-45)

Original image	Filtered image

Sigmoid 0.5, 5.0

gift.Sigmoid(0.5, 5.0)

Original image	Filtered image

Gamma correction = 0.5

gift.Gamma(0.5)

Original image	Filtered image

Gamma correction = 1.5

gift.Gamma(1.5)

Original image	Filtered image

Gaussian blur, sigma=1.0

gift.GaussianBlur(1.0)

Original image	Filtered image

Unsharp mask, sigma=1.0, amount=1.5, thresold=0.0

gift.UnsharpMask(1.0, 1.5, 0.0)

Original image	Filtered image

Grayscale

gift.Grayscale()

Original image	Filtered image

Sepia

gift.Sepia()

Original image	Filtered image

Invert

gift.Invert()

Original image	Filtered image

Local mean, disc shape, size=5

gift.Mean(5, true)

Original image	Filtered image

Local median, disc shape, size=5

gift.Median(5, true)

Original image	Filtered image

Local minimum, disc shape, size=5

gift.Minimum(5, true)

Original image	Filtered image

Local maximum, disc shape, size=5

gift.Maximum(5, true)

Original image	Filtered image

Convolution matrix - Emboss

gift.Convolution(
    []float32{
        -1, -1, 0,
        -1, 1, 1,
        0, 1, 1,
    },
    false, false, false, 0.0,
)

Original image	Filtered image

Convolution matrix - Edge detection

gift.Convolution(
    []float32{
        -1, -1, -1,
        -1, 8, -1,
        -1, -1, -1,
    },
    false, false, false, 0.0,
)

Original image	Filtered image

Name		Name	Last commit message	Last commit date
Latest commit History 21 Commits
LICENSE		LICENSE
README.md		README.md
colors.go		colors.go
colors_test.go		colors_test.go
convolution.go		convolution.go
convolution_test.go		convolution_test.go
gift.go		gift.go
gift_test.go		gift_test.go
pixels.go		pixels.go
pixels_test.go		pixels_test.go
rank.go		rank.go
rank_test.go		rank_test.go
resize.go		resize.go
resize_test.go		resize_test.go
transform.go		transform.go
transform_test.go		transform_test.go
utils.go		utils.go
utils_test.go		utils_test.go

License

kaiinui/gift

Folders and files

Latest commit

History

Repository files navigation

GO IMAGE FILTERING TOOLKIT (GIFT)

INSTALLATION / UPDATING

DOCUMENTATION

QUICK START

SUPPORTED FILTERS

FILTER EXAMPLES

Resize using lanczos resampling

Resize using linear resampling

Crop 90, 90 - 250, 250

Rotate 90 degrees

Rotate 180 degrees

Rotate 270 degrees

Flip horizontal

Flip vertical

Transpose

Transverse

Contrast +30%

Contrast -30%

Brightness +30%

Brightness -30%

Saturation +50%

Saturation -50%

Hue +45

Hue -45

Sigmoid 0.5, 5.0

Gamma correction = 0.5

Gamma correction = 1.5

Gaussian blur, sigma=1.0

Unsharp mask, sigma=1.0, amount=1.5, thresold=0.0

Grayscale

Sepia

Invert

Local mean, disc shape, size=5

Local median, disc shape, size=5

Local minimum, disc shape, size=5

Local maximum, disc shape, size=5

Convolution matrix - Emboss

Convolution matrix - Edge detection

About

Resources

License

Stars

Watchers

Forks