Go圖像過濾工具包：gift

包gift提供了一套有用的圖像處理過濾器。 純粹的Go實現，除Go標準庫之外沒有其它外部的依賴關系。

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)</pre> 
支持的過濾器




Transformations

Crop(rect image.Rectangle)
FlipHorizontal()
FlipVertical()
Resize(width, height int, resampling Resampling)
Rotate(angle float32, backgroundColor color.Color, interpolation Interpolation)
Rotate180()
Rotate270()
Rotate90()
Transpose()
Transverse()



Adjustments & effects

Brightness(percentage float32)
ColorBalance(percentageRed, percentageGreen, percentageBlue float32)
ColorFunc(fn func(r0, g0, b0, a0 float32) (r, g, b, a float32))
Colorize(hue, saturation, 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(percentage float32)
Sigmoid(midpoint, factor float32)
UnsharpMask(sigma, amount, thresold float32)



過濾器示例
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()
項目主頁：http://www.baiduhome.net/lib/view/home/1416985810284