Get the color of one pixel at Photoshop scripts

I am trying to figure out how to get the color of one defined Pixel.

In my imagination its shoud look like:

color = get.color.Pixel(x,y);

Maybe someone can help me with this piece of code?

Photoshop's JavaScript API doesn't provide a mechanism like you imagine in your question.

You'll need to utilize the Document.colorSamplers.add([x, y]) method, then read each component color value via its properties:

The following gist shows how to obtain either rgb or cmyk values for a given x,y coordinate:

#target photoshop

// Define the x and y coordinates for the pixel to sample.
var x = 1;
var y = 1;

// Add a Color Sampler at a given x and y coordinate in the image.
var pointSample = app.activeDocument.colorSamplers.add([(x - 1),(y - 1)]);

// Obtain array of RGB values.
var rgb = [
    pointSample.color.rgb.red,
    pointSample.color.rgb.green,
    pointSample.color.rgb.blue
];

// Obtain array of rounded CMYK values.
var cmyk = [
    Math.round(pointSample.color.cmyk.cyan),
    Math.round(pointSample.color.cmyk.magenta), 
    Math.round(pointSample.color.cmyk.yellow),
    Math.round(pointSample.color.cmyk.black)
];

// Remove the Color Sampler.
pointSample.remove();

// Display the complete RGB values and each component color.
alert('RGB: ' + rgb)
alert('red: ' + rgb[0])
alert('green: ' + rgb[1])
alert('blue: ' + rgb[2])

// Display the complete CMYK values and each component color.
alert('CMYK: ' + cmyk)
alert('cyan: ' + cmyk[0])
alert('magenta: ' + cmyk[1])
alert('yellow: ' + cmyk[2])
alert('black: ' + cmyk[3])