调用相机拍照后，将相片保存到本地；再打开照片读取照片的像素值，在真机上失真，请问怎么解决？？？急............ 注：在保存照片前，特意将第1、2、3个像素分别设置为红、绿、蓝，保存的照片也显示像素值设置成功了，在真机上读取时，第1、2、3个像素值明显错误，在开发环境下读取正确。机器是华为mate20。 以下为核心代码： //第一步：照相；    //第二步：将照片的第1个像素设置为红色，透明值230；第2个像素设置为绿色，透明值240；第3个像素设置为蓝色，透明值250；以示标记    //第三步：将照片保存到本地相册 this.ctx.takePhoto({       quality: 'high',       success: (res) => {         var context = wx.createCanvasContext('myCanvas');         var cvsInfoWidth = 400; //照片宽400         var cvsInfoHeight = 500; //照片高500         context.drawImage(res.tempImagePath, 0, 0, cvsInfoWidth, cvsInfoHeight);         context.draw(true, res => {            wx.canvasGetImageData({             canvasId: 'myCanvas',             x:0,             y:0,             width: cvsInfoWidth,             height: cvsInfoHeight,             success(res) {               const data1 = res.data; //获取图片像素值               data1[0] =255; //红色               data1[1] = 0;               data1[2] = 0;               data1[3] =230; //png照片的透明值               data1[4] = 0;               data1[5] =255; //绿色               data1[6] = 0;               data1[7] = 240; //png照片的透明值               data1[8] = 0;               data1[9] = 0;               data1[10] = 250; //蓝色               data1[11] = 255; //png照片的透明值               //重新设置canvas data               wx.canvasPutImageData({                 canvasId: 'myCanvas',                 x:0,                 y:0,                 width: Math.ceil(cvsInfoWidth),                 height: Math.ceil(cvsInfoHeight),                 data: data1,                 success(res) {                 }               });             }           })         });                    //---------使用wx.canvasToTempFilePath将画布保存为图片---------         setTimeout(() => {           wx.canvasToTempFilePath({             canvasId: 'myCanvas',             fileType:'png',             quality:1,             success: function (res) {               //将照片保存到本地相册             },             fail: function (res) {}           });         }, 1000);       }            }); //在另外一个页面读取照片的像素值   wx.chooseImage({       count: 1,       sizeType: ['original'],       sourceType: ['album'],       success(res) {         var cvsInfoWidth = 400;         var cvsInfoHeight = 500;         var context = wx.createCanvasContext('myCanvas1');         context.drawImage(res.tempFilePaths[0], 0, 0, cvsInfoWidth, cvsInfoHeight, 0, 0, cvsInfoWidth, cvsInfoHeight);         context.draw(true, res => {           //获取canvas图片数据                  wx.canvasGetImageData({             canvasId: 'myCanvas1',             x:0,             y:0,             width:  cvsInfoWidth,             height: cvsInfoHeight,             success(res) {               console.log(res.data);             }           })                    });       }     })