1 Correct answer
#target photoshop;
var Colour = app.foregroundColor;
var R = Colour.rgb.red.toFixed(2);
var G = Colour.rgb.green.toFixed(2);
var B = Colour.rgb.blue.toFixed(2);
alert("Red = " + R +"\nGreen = " + G + "\nBlue = "+ B);
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Ok I think I MIGHT have got it.
Download and unzip and put the dll in the Preset/scripts folder. Wikisend: free file sharing service
script to run...
//Windows 64bit ONLY!!!!!!!!!!!!!!
//Original c++ code can be found...
//https://forums.adobe.com/thread/2249343
//To compile you will need the Bridge SDK
//http://www.adobe.com/devnet/bridge.html
#target Photoshop
var SCRIPTS_FOLDER = decodeURI(app.path + '/' + localize('$$$/ScriptingSupport/InstalledScripts=Presets/Scripts'));
var libPath =SCRIPTS_FOLDER + "/BasicExternalObject.dll";
var psEX = new ExternalObject("lib:" + libPath);
//$.writeln("Original foreground colour = " + app.foregroundColor.rgb.hexValue);
pixCol = new SolidColor;
pixCol.rgb.hexValue= psEX.getXYcolour();
//$.writeln("Pixel colour = " + pixCol.rgb.hexValue);
var alph = 0.15;
MixRGB(alph,pixCol);
//$.writeln("Forground colour now = " +app.foregroundColor.rgb.hexValue);
psEX.unload();
function MixRGB(alph,pixCol){
var frg = new SolidColor;
fr = app.foregroundColor.rgb.red;
fg = app.foregroundColor.rgb.green;
fb = app.foregroundColor.rgb.blue;
frg.rgb.red =Math.floor(alph*pixCol.rgb.red+(1-alph)*fr );
frg.rgb.green=Math.floor(alph*pixCol.rgb.green+(1-alph)*fg);
frg.rgb.blue=Math.floor(alph*pixCol.rgb.blue+(1-alph)*fb );
app.foregroundColor= frg;
};
For the people who want to compile it themselves here it the new function to add to the original cpp.
extern "C" BASICEXTERNALOBJECT_API long getXYcolour(TaggedData* argv, long argc, TaggedData* retval)
{
// The returned value type
retval->type = kTypeString;
POINT p;
if (GetCursorPos(&p))
{
char buffer[10];
string X = itoa(p.x, buffer, 10);
string Y = itoa(p.y, buffer, 10);
string zero = "0";
COLORREF centerColor;
HDC hdc_ = GetDC(GetDesktopWindow());
centerColor = GetPixel(hdc_, p.x, p.y);
int _red = GetRValue(centerColor);
int _green = GetGValue(centerColor);
int _blue = GetBValue(centerColor);
char *l_pCharRes = new (char);
sprintf(l_pCharRes, "%02X", _red);
string sRED = l_pCharRes;
sprintf(l_pCharRes, "%02X", _green);
string sGREEN = l_pCharRes;
sprintf(l_pCharRes, "%02X", _blue);
string sBLUE = l_pCharRes;
string str = sRED + sGREEN + sBLUE;
retval->data.string = getNewBuffer(str);
}
else
{
retval->data.string = "Oh dear something went wrong. Sh*t";
}
return kESErrOK;
}
Hope this is something near 
wow. I cannot thank you enough for taking the time to look at this!
Yes, it is doing something - but the problem is, when I run the script, the foreground color is moving towards 100% white instead of moving towards the color under the cursor.
So for example, if the foreground color is Blue, and the color under the cursor is Yellow, then the foreground color should move towards the Yellow (15% each time you run the script).
Right now, the foreground color is only moving towards White.
But yes, it is near - it looks to be possible.
Again, I am eternally greatful for your time here. I wish I could do something in return 
Do you think it's possible to make it work?
Ah well I don't know what can be wrong. The sample colour is correct and can be checked by un-commenting the writeln's, it will then write the values in ExtendScript ToolKit.
We need help
yes,. I have that installed. The mixer function is fine, but it won't sample color under the cursor- it just finds white.
Oh well. Time to throw in the towel.
Thanks for your help! Much appreciated my friend. Perhaps someone will chime in later on and find a solution
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