Jimp JavaScript 编写的图像处理库

Jimp 是一个使用 JavaScript 编写的用于 Node 的图像处理库，具有零依赖的特性。

安装

npminstall--savejimp

示例代码

varJimp=require("jimp");//openafilecalled"lenna.png"Jimp.read("lenna.png",function(err,lenna){if(err)throwerr;lenna.resize(256,256)//resize.quality(60)//setJPEGquality.greyscale()//setgreyscale.write("lena-small-bw.jpg");//save});

基本用法

Jimp.read("./path/to/image.jpg").then(function(image){//dostuffwiththeimage}).catch(function(err){//handleanexception});

对图像操作的一些方法

/*Resize*/image.contain(w,h[,alignBits||mode,mode]);//scaletheimagetothegivenwidthandheight,somepartsoftheimagemaybeletterboxedimage.cover(w,h[,alignBits||mode,mode]);//scaletheimagetothegivenwidthandheight,somepartsoftheimagemaybeclippedimage.resize(w,h[,mode]);//resizetheimage.Jimp.AUTOcanbepassedasoneofthevalues.image.scale(f[,mode]);//scaletheimagebythefactorfimage.scaleToFit(w,h[,mode]);//scaletheimagetothelargestsizethatfitsinsidethegivenwidthandheight//Anoptionalresizemodecanbepassedwithallresizemethods./*Crop*/image.autocrop([tolerance,frames]);//automaticallycropsame-colorbordersfromimage(ifany),framesmustbeaBooleanimage.crop(x,y,w,h);//croptothegivenregion/*Flipandrotate*/image.flip(horz,vert);//fliptheimagehorizontallyorverticallyimage.mirror(horz,vert);//analiasforflipimage.rotate(deg[,mode]);//rotatetheimageclockwisebyanumberofdegrees.Optionally,aresizemodecanbepassed.If`false`ispassedasthesecondparameter,theimagewidthandheightwillnotberesized.image.exifRotate();//JPEGimageswithEXIForientationdatawillbeautomaticallyre-orientatedasappropriate.