High Quality Image

BRAVIA Professional Display provides a special way to render an image file in high-quality in an application. In this case, an image is rendered in a 4K YUV physical plane separated from the RGB plane.

  <object id="hq-img" type="application/x-4k-photo" width="1920" height="1080"></object>

The advantages of this function are:

• Much better quality compared with <img> tag
• 4K resolution is supported
• Preload and cache are supported

However, there are some restrictions:

• Only one <object> can be opened at a time, and cannot be used with Media Elements (<audio> and <video>) and other <object> elements
• HTTP cookies are not supported when acquiring the image data
• Relative path is not supported

Methods

• long open()

  open() prepares for image rendering and returns 0 on success.

• void close()

  close() releases the resource for image rendering.

• long show(DOMString url)

  show() starts loading and rendering the image specified by the parameter 'url'.

• long getStatus()

  getStatus() gets the status of the object tag and returns non-zero value when the object tag is opened.

• long preload(DOMString url)

  preload() preloads the image data specified by the parameter 'url' and stores it in the memory.

Events

• onshow

  onshow is called when the image rendering is complete.

  • 0: success
  • non-zero: error

• onpreload

  onpreload is called when preload is complete.

  • 0: success or already cached
  • -1: error

Attributes

• DOMString zoomMode

  zoomMode decides zoom mode

  • values: 'NoExpand' or 'Smart'.
  • default: 'NoExpand'

• boolean is4kPanel

  is4kPanel shows the panel information of the display.

  • true: if the panel is 4k or 8k
  • false: if the panel is not 4k or 8k

• boolean is4kPlayback

  is4kPlayback shows the capability of the 4k or 8k photo playback mode.

  • true: if the 4k or 8k photo playback mode is enabled in the setting
  • false: if the 4k or 8k photo playback mode is not enabled in the setting

Example

Please download a sample application and it shows a special way to render an image file in high-quality in an application.

The snippet below shows how to preload image data.

var object = document.getElementById('hq-img');
object.open();
object.onpreload = function(url, result) {
  object.show(url);
};
object.preload('https://example.com/4k_image.jpg');