☰

Image Background Color

Sets a checkerboard (or color) background on images viewed standalone.

Cómo instalar

Tendrás que instalar una extensión para tu navegador como Tampermonkey, Greasemonkey o Violentmonkey si quieres utilizar este script.

Necesitarás instalar una extensión como Tampermonkey o Violentmonkey para instalar este script.

Necesitarás instalar una extensión como Tampermonkey o Violentmonkey para instalar este script.

Necesitarás instalar una extensión como Tampermonkey o Userscripts para instalar este script.

Necesitará instalar una extensión como Tampermonkey para instalar este script.

Necesitarás instalar una extensión para administrar scripts de usuario si quieres instalar este script.

(Ya tengo un administrador de scripts de usuario, déjame instalarlo)

Cómo instalar

Necesitará instalar una extensión como Stylus para instalar este estilo.

Necesitará instalar una extensión como Stylus para instalar este estilo.

Necesitará instalar una extensión como Stylus para instalar este estilo.

Necesitará instalar una extensión del gestor de estilos de usuario para instalar este estilo.

Necesitará instalar una extensión del gestor de estilos de usuario para instalar este estilo.

Necesitará instalar una extensión del gestor de estilos de usuario para instalar este estilo.

(Ya tengo un administrador de estilos de usuario, déjame instalarlo) 

// ==UserScript==
// @name        Image Background Color
// @namespace   leaumar
// @match       *://*/*
// @grant       none
// @version     2
// @author      [email protected]
// @description Sets a checkerboard (or color) background on images viewed standalone.
// @license     MPL-2.0
// @icon        data:image/png;base64,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
// ==/UserScript==

const checkerBoard = {
  backgroundColor: 'darkgrey',
  backgroundImage: 'linear-gradient(45deg, grey 25%, transparent 25%, transparent 75%, grey 75%, grey), linear-gradient(45deg, grey 25%, transparent 25%, transparent 75%, grey 75%, grey)',
  backgroundPosition: '0 0, 2vmin 2vmin',
  backgroundSize: '4vmin 4vmin',
};

function setBackground(node) {
  Object.assign(node.style, checkerBoard);
  // or assign a fixed color if you want
  // node.style.backgroundColor = '#333';
}

function getStandaloneImage() {
  const tags = [...document.body.childNodes]
    .filter(node => node.nodeName !== '#text');

  return tags.length === 1 && tags[0].nodeName === 'IMG' ? tags[0] : null;
}

function clearAllBackgrounds(upFrom) {
  let current = upFrom;
  while (current?.style != null) {
    current.style.background = 'unset';
    current = current.parentNode;
  }
}

(function main() {
  const img = getStandaloneImage();
  if (img != null) {
    clearAllBackgrounds(img);
    setBackground(document.body);
  }
})();