Question

我有画廊经理和放置区（画廊图片）。文件丢失时。我使用FileReader进行读取并获取图像的base64数据。我的目标是在客户端上调整所有图像（制作拇指/普通图像）。问题：我可以将base64放入画布然后调整画布大小并获得调整大小的图像的新base64吗？

Answer 1

$.getImageData({
  url: "http://farm4.static.flickr.com/3002/2758349058_ab6dc9cfdc_z.jpg?zz=1",
  success: function(image){

    // Set up the canvas
    var can = document.getElementsByTagName('canvas')[0];
    var ctx = can.getContext('2d');

    // Set the canvas width and heigh to the same as the image
    $(can).attr('width', image.width);
    $(can).attr('height', image.height);

    // Draw the image on to the canvas
    ctx.drawImage(image, 0, 0, image.width, image.height);

    // Get the image data
    var image_data = ctx.getImageData(0, 0,  image.width, image.height);
    var image_data_array = image_data.data;


    // Write the image data to the canvas
    ctx.putImageData(image_data, 0, 0);

  },
  error: function(xhr, text_status){
    // Handle your error here
  }
});

在客户端上读取文件图像数据并调整其大小

1 个答案: