Tomas Aparicio
1d76750fb9
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11 years ago | |
|---|---|---|
| fixtures | 11 years ago | |
| .editorconfig | 11 years ago | |
| .gitignore | 11 years ago | |
| .travis.yml | 11 years ago | |
| LICENSE | 11 years ago | |
| README.md | 11 years ago | |
| debug.go | 11 years ago | |
| file.go | 11 years ago | |
| file_test.go | 11 years ago | |
| image.go | 11 years ago | |
| image_test.go | 11 years ago | |
| metadata.go | 11 years ago | |
| metadata_test.go | 11 years ago | |
| options.go | 11 years ago | |
| resize.go | 11 years ago | |
| resize_test.go | 11 years ago | |
| type.go | 11 years ago | |
| type_test.go | 11 years ago | |
| version.go | 11 years ago | |
| vips.go | 11 years ago | |
| vips.h | 11 years ago | |
| vips_test.go | 11 years ago | |
README.md
bimg 
Small Go library for blazing fast and efficient image processing based on libvips using C bindings. It provides a clean, simple and fluent API in pure Go.
bimg was designed to be a small and efficient library with a generic and useful features.
It uses internally libvips, a powerful library written in C for binary image processing which requires a low memory footprint
and it's typically 4x faster than using the quickest ImageMagick and GraphicsMagick settings or Go native image package, and in some cases it's even 8x faster processing JPEG images.
It can read JPEG, PNG, WEBP and TIFF formats and output to JPEG, PNG and WEBP, including conversion between them. It supports common image operations such as crop, resize, rotate, zoom, watermark...
For getting started, take a look to the examples and programmatic API documentation. If you're looking for a HTTP-based image processing solution, see imaginary.
bimg was heavily inspired in sharp, its homologous package built for node.js by Lovell Fuller.
Note: bimg is still beta. Do not use in compromised environments yet
Prerequisites
- libvips v7.40.0+ (7.42.0+ recommended)
- C compatible compiler such as gcc 4.6+ or clang 3.0+
- Go 1.3+
Installation
go get -u gopkg.in/h2non/bimg.v0
libvips
Run the following script as sudo (supports OSX, Debian/Ubuntu, Redhat, Fedora, Amazon Linux):
curl -s https://raw.githubusercontent.com/lovell/sharp/master/preinstall.sh | sudo bash -
The install script requires curl and pkg-config
Supported image operations
- Resize
- Enlarge
- Crop
- Rotate (with auto-rotate based on EXIF orientation)
- Flip (with auto-flip based on EXIF metadata)
- Flop
- Zoom
- Thumbnail
- Extract area
- Watermark (fully customizable text-based)
- Format conversion (with additional quality/compression settings)
- EXIF metadata (size, alpha channel, profile, orientation...)
Performance
libvips is probably the faster open source solution for image processing. Here you can see some performance test comparisons for multiple scenarios:
Benchmarks
Tested using Go 1.4.2 and libvips-7.42.3 in OSX i7 2.7Ghz
BenchmarkResizeLargeJpeg 50 43400480 ns/op
BenchmarkResizePng 20 57592174 ns/op
BenchmarkResizeWebP 500 2872295 ns/op
BenchmarkConvertToJpeg 30 41835497 ns/op
BenchmarkConvertToPng 10 153382204 ns/op
BenchmarkConvertToWebp 10000 264542 ns/op
BenchmarkCropJpeg 30 52267699 ns/op
BenchmarkCropPng 30 56477454 ns/op
BenchmarkCropWebP 5000 274302 ns/op
BenchmarkExtractJpeg 50 27827670 ns/op
BenchmarkExtractPng 2000 769761 ns/op
BenchmarkExtractWebp 3000 513954 ns/op
BenchmarkZoomJpeg 10 159272494 ns/op
BenchmarkZoomPng 20 65771476 ns/op
BenchmarkZoomWebp 5000 368327 ns/op
BenchmarkWatermarkJpeg 100 10026033 ns/op
BenchmarkWatermarPng 200 7350821 ns/op
BenchmarkWatermarWebp 200 9014197 ns/op
ok 30.698s
API
Examples
import (
"fmt"
"os"
"gopkg.in/h2non/bimg.v0"
)
Resize
buffer, err := bimg.Read("image.jpg")
if err != nil {
fmt.Fprintln(os.Stderr, err)
}
newImage, err := bimg.NewImage(buffer).Resize(800, 600)
if err != nil {
fmt.Fprintln(os.Stderr, err)
}
size, err := bimg.NewImage(newImage).Size()
if size.Width == 400 && size.Height == 300 {
fmt.Println("The image size is valid")
}
bimg.Write("new.jpg", newImage)
Rotate
buffer, err := bimg.Read("image.jpg")
if err != nil {
fmt.Fprintln(os.Stderr, err)
}
newImage, err := bimg.NewImage(buffer).Rotate(90)
if err != nil {
fmt.Fprintln(os.Stderr, err)
}
bimg.Write("new.jpg", newImage)
Convert
buffer, err := bimg.Read("image.jpg")
if err != nil {
fmt.Fprintln(os.Stderr, err)
}
newImage, err := bimg.NewImage(buffer).Convert(bimg.PNG)
if err != nil {
fmt.Fprintln(os.Stderr, err)
}
if bimg.NewImage(newImage).Type() == "png" {
fmt.Fprintln(os.Stderr, "The image was converted into png")
}
Custom options
See Options struct to discover all the available fields
options := bimg.Options{
Width: 800,
Height: 600,
Crop: true,
Quality: 95,
Rotate: 180,
}
buffer, err := bimg.Read("image.jpg")
if err != nil {
fmt.Fprintln(os.Stderr, err)
}
newImage, err := bimg.NewImage(buffer).Process(options)
if err != nil {
fmt.Fprintln(os.Stderr, err)
}
bimg.Write("new.jpg", newImage)
Watermark
buffer, err := bimg.Read("image.jpg")
if err != nil {
fmt.Fprintln(os.Stderr, err)
}
options := bimg.Watermark{
Watermark{
Text: "Chuck Norris (c) 2315",
Opacity: 0.25,
Width: 200,
DPI: 100,
Margin: 150,
Font: "sans bold 12",
Background: bimg.Color{255, 255, 255},
}
}
newImage, err := bimg.NewImage(buffer).Watermark(options)
if err != nil {
fmt.Fprintln(os.Stderr, err)
}
bimg.Write("new.jpg", newImage)
Fluent interface
buffer, err := bimg.Read("image.jpg")
if err != nil {
fmt.Fprintln(os.Stderr, err)
}
image := bimg.NewImage(buffer)
// first crop image
_, err := image.CropByWidth(300)
if err != nil {
fmt.Fprintln(os.Stderr, err)
}
// then flip it
newImage, err := image.Flip()
if err != nil {
fmt.Fprintln(os.Stderr, err)
}
// save the cropped and flipped image
bimg.Write("new.jpg", newImage)
Debugging
Run the process passing the DEBUG environment variable
DEBUG=* ./app
Enable libvips traces (note that a lot of data will be written in stdout):
VIPS_TRACE=1 ./app
func DetermineImageTypeName
func DetermineImageTypeName(buf []byte) string
Determines the image type format by name (jpeg, png, webp or tiff)
func Initialize
func Initialize()
Explicit thread-safe start of libvips. Only call this function if you've previously shutdown libvips
func IsTypeNameSupported
func IsTypeNameSupported(t string) bool
Check if a given image type name is supported
func IsTypeSupported
func IsTypeSupported(t ImageType) bool
Check if a given image type is supported
func PrintMemoryStats
func PrintMemoryStats()
Print Go memory and garbage collector stats. Useful for debugging
func Read
func Read(path string) ([]byte, error)
func Resize
func Resize(buf []byte, o Options) ([]byte, error)
func Shutdown
func Shutdown()
Explicit thread-safe libvips shutdown. Call this to drop caches. If libvips was already initialized, the function is no-op
func VipsDebug
func VipsDebug()
Output to stdout vips collected data. Useful for debugging
func Write
func Write(path string, buf []byte) error
type Angle
type Angle int
const (
D0 Angle = C.VIPS_ANGLE_D0
D90 Angle = C.VIPS_ANGLE_D90
D180 Angle = C.VIPS_ANGLE_D180
D270 Angle = C.VIPS_ANGLE_D270
)
type Color
type Color struct {
R, G, B uint8
}
Color represents a traditional RGB color scheme
type Direction
type Direction int
const (
HORIZONTAL Direction = C.VIPS_DIRECTION_HORIZONTAL
VERTICAL Direction = C.VIPS_DIRECTION_VERTICAL
)
type Gravity
type Gravity int
const (
CENTRE Gravity = iota
NORTH
EAST
SOUTH
WEST
)
type Image
type Image struct {
}
func NewImage
func NewImage(buf []byte) *Image
Creates a new image
func (*Image) Convert
func (i *Image) Convert(t ImageType) ([]byte, error)
Convert image to another format
func (*Image) Crop
func (i *Image) Crop(width, height int, gravity Gravity) ([]byte, error)
Crop the image to the exact size specified
func (*Image) CropByHeight
func (i *Image) CropByHeight(height int) ([]byte, error)
Crop an image by height (auto width)
func (*Image) CropByWidth
func (i *Image) CropByWidth(width int) ([]byte, error)
Crop an image by width (auto height)
func (*Image) Enlarge
func (i *Image) Enlarge(width, height int) ([]byte, error)
Enlarge the image from the by X/Y axis
func (*Image) Extract
func (i *Image) Extract(top, left, width, height int) ([]byte, error)
Extract area from the by X/Y axis
func (*Image) Flip
func (i *Image) Flip() ([]byte, error)
Flip the image about the vertical Y axis
func (*Image) Flop
func (i *Image) Flop() ([]byte, error)
Flop the image about the horizontal X axis
func (*Image) Image
func (i *Image) Image() []byte
Get image buffer
func (*Image) Metadata
func (i *Image) Metadata() (ImageMetadata, error)
Get image metadata (size, alpha channel, profile, EXIF rotation)
func (*Image) Process
func (i *Image) Process(o Options) ([]byte, error)
Transform the image by custom options
func (*Image) Resize
func (i *Image) Resize(width, height int) ([]byte, error)
Resize the image to fixed width and height
func (*Image) Rotate
func (i *Image) Rotate(a Angle) ([]byte, error)
Rotate the image by given angle degrees (0, 90, 180 or 270)
func (*Image) Size
func (i *Image) Size() (ImageSize, error)
Get image size
func (*Image) Thumbnail
func (i *Image) Thumbnail(pixels int) ([]byte, error)
Thumbnail the image by the a given width by aspect ratio 4:4
func (*Image) Type
func (i *Image) Type() string
Get image type format (jpeg, png, webp, tiff)
func (*Image) Watermark
func (i *Image) Watermark(w Watermark) ([]byte, error)
Add text as watermark on the given image
func (*Image) Zoom
func (i *Image) Zoom(level int) ([]byte, error)
Zoom the image by the given factor
type ImageMetadata
type ImageMetadata struct {
Orientation int
Channels int
Alpha bool
Profile bool
Type string
Space string
Size ImageSize
}
func Metadata
func Metadata(buf []byte) (ImageMetadata, error)
Extract the image metadata (size, type, alpha channel, profile, EXIF orientation...)
type ImageSize
type ImageSize struct {
Width int
Height int
}
func Size
func Size(buf []byte) (ImageSize, error)
Get the image size by width and height pixels
type ImageType
type ImageType int
const (
UNKNOWN ImageType = iota
JPEG
WEBP
PNG
TIFF
MAGICK
)
func DetermineImageType
func DetermineImageType(buf []byte) ImageType
Determines the image type format (jpeg, png, webp or tiff)
type Interpolator
type Interpolator int
const (
BICUBIC Interpolator = iota
BILINEAR
NOHALO
)
func (Interpolator) String
func (i Interpolator) String() string
type Options
type Options struct {
Height int
Width int
AreaHeight int
AreaWidth int
Top int
Left int
Extend int
Quality int
Compression int
Zoom int
Crop bool
Enlarge bool
Embed bool
Flip bool
Flop bool
NoAutoRotate bool
Rotate Angle
Gravity Gravity
Watermark Watermark
Type ImageType
Interpolator Interpolator
}
type VipsMemoryInfo
type VipsMemoryInfo struct {
Memory int64
MemoryHighwater int64
Allocations int64
}
func VipsMemory
func VipsMemory() VipsMemoryInfo
Get memory info stats from vips (cache size, memory allocs...)
type Watermark
type Watermark struct {
Width int
DPI int
Margin int
Opacity float32
NoReplicate bool
Text string
Font string
Background Color
}
Special Thanks
License
MIT - Tomas Aparicio
