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imgaeprocess

0.安装

go get github.com/AndsGo/imageprocess

1.代码示例

// 改变大小，高100px，宽300px，模式等比缩放匹配最大边img=imageprocess.ResizeImage(img,ResizeOption{ResizeMode:Lfit,Width:10,Height:100)// 将原图缩放成宽高100 px：`resize,h_100,w_100` 缩放模式fill：`m_fill`img=imageprocess.ResizeImage(img,ResizeOption{ResizeMode:Fill,Width:10,Height:100)// 将原图缩放成宽高100 px：`resize,h_100,w_100` 缩放模式pad：`m_pad`。 以红色填充：`color_FF0000`img=imageprocess.ResizeImage(img,ResizeOption{ResizeMode:Pad,Width:10,Height:100Color:&color.RGBA{R:255,G:0,B:0,A:255}})// 将example.jpg缩略为宽高300：`resize,w_300,h_300` 水印内容为“Hello World”：`text_Hello%20World 水印文字颜色为白色、字体大小为30：`color_FFFFFF,size_30` ` 水印文字位置是右下、水平边距10、中线垂直偏移10：`g_se,x_10,y_10`// 多模式串行处理可以使用Process或(ProcessGif)方法，你也可以全部使用Process或(ProcessGif)方法进行处理options:=make([]Option,0)options=append(options,Option{Resize,ResizeOption{Width:300,Height:300)options=append(options,Option{Watermark,TextWatermarkOption{WatermarkOption:WatermarkOption{Opacity:20,Position:Center,X:10,Y:10,},Color:&color.RGBA{255,255,255,1},Size:30,Text:"Hello World"}})imageprocess.Process(img,file,options)// 裁剪起点为（800,500）：`crop,x_800,y_500` 裁减范围300 px*300 px：`w_300,h_300`img=imageprocess.CropImage(img,CropOption{X:800,Y:500,Width:300,Height:300})// 裁剪起点为原图右下角：`crop,g_se` 裁减范围900 px*900 px：`w_900,h_900`img=imageprocess.CropImage(img,CropOption{Position:SouthEast,Width:900,Height:900})// 原图缩放为宽100 px：`resize,w_100,h_100` 图片相对质量设置为80%：`quality,q_80`options:=make([]Option,0)options=append(options,Option{Resize,ResizeOption{Width:100,Height:100)// 质量options=append(options,Option{Quality,QualityOption{Quality:80}})// 格式转换为PNGoptions=append(options,Option{FormatType,FormatOption{Format:PNG}})imageprocess.Process(img,file,options)// 将原图按顺时针旋转90°img=imageprocess.AddjustRotate(img,RotateOption{Value:90})// 将图片亮度提高50img=imageprocess.AddjustBright(img,BrightnessOption{Value:50})// 对原图进行锐化处理，锐化参数为100img=imageprocess.AddjustSharpen(img,SharpenOption{Value:100})// 对比度提高50img=imageprocess.AddjustContrast(img,ContrastOption{Value:50})

package imageprocessimport ("image/color""os""testing")funcTest_Process(t*testing.T) {img,f,err:=LoadImage("examples/example.jpg")iferr!=nil {t.Error(err)}file,_:=os.Create("examples/out.jpg")options:=make([]Option,0)// 格式转换为PNGoptions=append(options,Option{FormatType,FormatOption{Format:PNG}})//  改变大小options=append(options,Option{Resize,ResizeOption{ResizeMode:Pad,Width:300,Height:300,Color:&color.RGBA{R:255,G:255,B:0,A:255}}})// 裁剪options=append(options,Option{Crop,CropOption{Width:200,Height:200,X:0,Y:0,Position:Center}})// 水印options=append(options,Option{Watermark,TextWatermarkOption{WatermarkOption:WatermarkOption{Opacity:100,Position:South,X:10,Y:10,},Color:&color.RGBA{111,222,111,1},Size:40,Text:"hello watermark"}})// 模糊options=append(options,Option{Blur,GammaOption{Value:5}})// 质量options=append(options,Option{Quality,QualityOption{Quality:500}})err=Process(img,file,f,options)iferr!=nil {t.Error(err)}}funcTest_ProcessGif(t*testing.T) {img,err:=LoadGif("examples/example.gif")iferr!=nil {t.Error(err)}file,_:=os.Create("examples/out.gif")options:=make([]Option,0)// 格式转换为GIFoptions=append(options,Option{FormatType,FormatOption{Format:GIF}})options=append(options,Option{Gamma,GammaOption{Value:500}})options=append(options,Option{Resize,ResizeOption{ResizeMode:Pad,Width:300,Height:300,Color:&color.RGBA{R:255,G:255,B:255,A:1}}})options=append(options,Option{Crop,CropOption{Width:200,Height:200,X:0,Y:0,Position:Center}})options=append(options,Option{Watermark,TextWatermarkOption{WatermarkOption:WatermarkOption{Opacity:20,Position:Center,X:10,Y:10,},Color:&color.RGBA{0,0,0,1},Size:40,Text:"hello watermark"}})err=ProcessGif(img,file,options)iferr!=nil {t.Error(err)}}funcTest_UrlOptions(t*testing.T) {img,f,err:=LoadImage("examples/example.jpg")iferr!=nil {t.Error(err)}file,_:=os.Create("examples/out.jpg")// 增加水印，然后修改大小options,err:=ParseOptions("image/watermark,t_30,g_center,x_10,y_10,text_hello watermark,color_1366ec,size_200/resize,m_pad,h_100,w_100,color_FF0000")iferr!=nil {t.Error(err)}err=Process(img,file,f,options)iferr!=nil {t.Error(err)}}

2.参数示例

funcTest_UrlOptions(t*testing.T) {img,f,err:=LoadImage("examples/example.jpg")iferr!=nil {t.Error(err)}file,_:=os.Create("examples/out.jpg")// 增加水印，然后修改大小options,err:=ParseOptions("image/watermark,t_30,g_center,x_10,y_10,text_hello watermark,color_1366ec,size_200/resize,m_pad,h_100,w_100,color_FF0000")iferr!=nil {t.Error(err)}// 处理图片err=Process(img,file,f,options)iferr!=nil {t.Error(err)}}

3.综合示例

cd examplesgo run example.go

package mainimport ("fmt""image/gif""io""net/http""os""strings""github.com/AndsGo/imageprocess")// 文件夹，you need change itvarfileFolders="./"funcmain() {http.HandleFunc("/file/",fileHandler)fmt.Println("Starting server on :8080")iferr:=http.ListenAndServe(":8080",nil);err!=nil {fmt.Println("Server failed:",err)}}funcfileHandler(w http.ResponseWriter,r*http.Request) {// 获取文件名称fileName:=strings.TrimPrefix(r.URL.Path,"/file/")// 打开文件file,err:=os.Open(fmt.Sprintf("%s%s",fileFolders,fileName))iferr!=nil {http.Error(w,"File not found",http.StatusNotFound)return}deferfile.Close()// 获取参数// 获取文件后缀f,err:=imageprocess.FormatFromExtension(fileName)iferr!=nil {// 将处理后的文件内容写入响应if_,err:=io.Copy(w,file);err!=nil {http.Error(w,"Failed to send file",http.StatusInternalServerError)}return}//处理处理参数ossParams:=r.URL.Query().Get("x-oss-process")ifossParams=="" {//无需处理if_,err:=io.Copy(w,file);err!=nil {http.Error(w,"Failed to send file",http.StatusInternalServerError)}return}options,err:=imageprocess.ParseOptions(ossParams)iferr!=nil {http.Error(w,fmt.Sprintf("ParseOptions %s",err.Error()),http.StatusInternalServerError)return}iflen(options)==0 {//无需处理if_,err:=io.Copy(w,file);err!=nil {http.Error(w,"Failed to send file",http.StatusInternalServerError)}return}//处理图片err=processImg(file,w,f,options)iferr!=nil {http.Error(w,fmt.Sprintf("processFile %s",err.Error()),http.StatusInternalServerError)}}// 进行转换funcprocessImg(file io.Reader,w io.Writer,f imageprocess.Format,options []imageprocess.Option)error {iff==imageprocess.GIF {imgGif,err:=gif.DecodeAll(file)iferr!=nil {returnerr}returnimageprocess.ProcessGif(imgGif,w,options)}else {img,err:=imageprocess.DecodeImage(file,f)iferr!=nil {returnerr}returnimageprocess.Process(img,w,f,options)}}