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jerrywhatsoeveryahoo.com / BGColorRemover

// ==UserScript==
// @id             BGColorRemover
// @name           BGColorRemover
// @version        2.0
// @namespace      http://superuser.com/a/468606/563809
// @author         HowardSmith (Jerry modified)
// @match        *://andysbrainblog.blogspot.com
// @match        *://andysbrainblog.blogspot.com/*
// @description    Reset background color to white
// @run-at         document-start
// ==/UserScript==

(function () {
    function noWhiteBackgroundColor() {
    
        function changeBackgroundColor(x)  {  // auto change colors too close to white
            var backgroundColorRGB=window.getComputedStyle(x,null).backgroundColor;  // get background-color
            // may also call window.getComputedStyle(x,null).getPropertyValue('color')
            // property list at https://www.w3.org/TR/1998/REC-CSS2-19980512/propidx.html
            var fontColorRGB=window.getComputedStyle(x,null).color;  // get font-color
            if(backgroundColorRGB!="transparent")  {  // convert hex color to rgb color to compare
                var RGBValuesArray = backgroundColorRGB.match(/\d+/g); //get rgb values
                var red   = RGBValuesArray[0];
                var green = RGBValuesArray[1];
                var blue  = RGBValuesArray[2];
                
                // ============================================================================
                // Set the base colors you require: 
                // use: http://www.colorpicker.com
                // to find the rgb values of the base colour you wish to suppress white backgrounds with:
                // gray (220, 220, 220)
                // ============================================================================
                
                var red_needed   = 255;
                var green_needed = 255;
                var blue_needed  = 255;
                
                
                // if (red>=220&&green>=220&&blue>=220) {   // white range detection

                //    if      (red>=250&&red<=255&&green>=250&&green<=255&&blue>=250&&blue<=255) {
                //       red_needed   += 0;
                //       green_needed += 0; }
  
                //    else if (red>=240&&red<=255&&green>=240&&green<=255&&blue>=240&&blue<=255) {
                //       red_needed   += 6;
                //       green_needed += 3; }  

                //    else if (red>=230&&red<=255&&green>=230&&green<=255&&blue>=230&&blue<=255) {
                //       red_needed   += 10;
                //       green_needed += 5; }

                //    else if (red>=220&&red<=255&&green>=220&&green<=255&&blue>=220&&blue<=255) {
                //       red_needed   += 14;
                //       green_needed += 7; } 
                      
                //    x.style.backgroundColor="rgb( " +red_needed+ ", " +green_needed+ ", " +blue_needed+ ")"; // the background-color you want 
                //    }
                // may use setProperty('color','black','important') //name, value, priority
                x.style.backgroundColor="rgb( " +red_needed+ ", " +green_needed+ ", " +blue_needed+ ")"; // the background-color you want 
                x.style.color="black";
                }
            }
        var allElements=document.getElementsByTagName("*");  // get all elements on a page
        for(var i=0; i<allElements.length; i++)  {
            changeBackgroundColor(allElements[i]);}
    }
    window.addEventListener("DOMContentLoaded",noWhiteBackgroundColor, false);
})() ;