function resize(newWidth, newHeight){
  const pageUid = doc.pages[0];
  const pageData = await doc.getPageData(pageUid)
  const imageProcess = Dynamsoft.DDV.Experiments.get("ImageProcess");
  const result = await imageProcess.process({type:3, data:pageData.display.data}, {type:13/*resize*/, params:{newWidth:newWidth, newHeight:newHeight, mode:2}});
  const newImage = new Blob([result.output],{type:result.outputContentType});
  await doc.updatePage(pageUid, newImage, {});
}

async function performColorConversion(type){
  const pageUid = doc.pages[0];
  const pageData = await doc.getPageData(pageUid)
  const imageProcess = Dynamsoft.DDV.Experiments.get("ImageProcess");
  const result = await imageProcess.process({type:3, data:pageData.display.data}, {type: type/*1: blackAndWhite 2: gray*/, params:{saveInk:false, level:1}});
  const newImage = new Blob([result.output],{type:result.outputContentType});
  await doc.updatePage(pageUid, newImage, {});
}

let blob = await doc.saveToJpeg(0,{quality: 50});

let blob;
let quality = 1.0;
let imageFormat = "image/webp";
const isPDF = imageFormat.indexOf("pdf") != -1;
if (imageFormat === "image/png") {
  blob = await doc.saveToPng(0,{});
}else if (imageFormat === "image/jpeg") {
  blob = await doc.saveToJpeg(0,{quality: quality*100});
  console.log({quality: quality*100});
}else if (imageFormat === "image/webp") {
  let pngBlob = await doc.saveToPng(0,{});
  blob = await convertBlobToWebP(pngBlob,quality);
}else if (isPDF) {
  blob = await doc.saveToPdf([0],{quality: quality*100,compression:imageFormat});
}

function convertBlobToWebP(blob,quality){
  return new Promise((resolve, reject) => {
    const url = URL.createObjectURL(blob);
    let tmpImg = document.createElement("img");
    tmpImg.onload = function(){
      let width = tmpImg.naturalWidth;
      let height = tmpImg.naturalHeight;
      let context = canvas.getContext('2d');
      canvas.width = width;
      canvas.height = height;
      context.drawImage(tmpImg, 0, 0, tmpImg.naturalWidth, tmpImg.naturalHeight, 0, 0, canvas.width, canvas.height);
      canvas.toBlob((blob)=>{
        resolve(blob);
      },"image/webp",quality)
    }
    tmpImg.src = url;
  })
}