Command line interface to the Go Image Filtering Toolkit
go get github.com/ajstarks/gift
gift reads either from a single file (PNG or JPEG) or standard input and always writes to standard output:
gift -contrast 80 foo.jpg > contrast.jpg
gift -flipv < foo.png > flipped.png
Filters can be combined. For example to blur and invert:
gift -invert -blur 4 foo.jpg > inverted-blurred.jpg
Here are the command flags:
-blur float
blur value
-brightness float
brightness value (-100, 100) (default -200)
-colorbalance string
color balance (%red, %green, %blue)
-colorize string
colorize (hue, saturation, percentage)
-contrast float
contrast value (-100, 100) (default -200)
-crop string
crop x1,y1,x2,y2
-cropsize string
crop w h
-edge
edge filter
-emboss
emboss
-fliph
flip horizontal
-flipv
flip vertical
-gamma float
gamma value
-gray
grayscale
-hue float
hue value (-180, 180) (default -200)
-invert
invert
-max int
local maximum (kernel size)
-mean int
local mean filter (kernel size)
-median int
local median filter (kernel size)
-min int
local minimum (kernel size)
-opacity float
opacity (alpha) (0-100)
-pixelate int
pixelate
-resize string
resize w,h
-resizefill string
resizefill w,h
-resizefit string
resizefit w,h
-rotate int
rotate specified degrees counter-clockwise
-saturation float
saturation value (-100, 500) (default -200)
-sepia float
sepia percentage (0-100) (default -1)
-sigmoid string
sigmoid contrast (midpoint,factor)
-sobel
sobel filter
-threshold float
color threshold percentage (0-100) (default -1)
-transpose
flip horizontally and rotate 90° counter-clockwise
-transverse
flips vertically and rotate 90° counter-clockwise
-unsharp string
unsharp mask (sigma,amount,threshold)
See testgift.sh for typical usage
Processing a 3264x2448 JPEG image on a Lenovo X1 Carbon 5th Generation, i5-6200U CPU @ 2.30GHz, Linux 5.13.5
