adobe photoshop - How to select all shapes with specific color and replace this color with an other one?

I am totally new in Photoshop scripting, but I have some JavaScript experience.

I want to make a script (or find an existing one and study it) that finds every shape with a specific fill color in my Photoshop project and replaces it with an other one. But I have no idea where to start.

Answer

Normally you'd expect a script for this to be something like

activeDocument.layers.forEach(function(el) {
    if (el.fillColor == oldColor) el.fillColor = newColor
});

I welcome you to a world of Photoshop Scripting: a world of pain and suffering. While there's a certain number of things you can achieve using Photoshop DOM, a lot of functions and properties are only a available as Action Manager code, used to drive Photoshop at a lower level.

So while the algorithm stays the same — I look for the shape layers with a particular color and then change it — the code may look a little confusing.

var layers = getAllShapeLayersData(),
    sourceColor = [255, 0, 255], // color to look for

    targetColor = [128, 128, 128]; // color to change to

// creating a native Photoshop color object to compare hex values instead of RGBs
var colorToChange = new SolidColor();
colorToChange.rgb.red = sourceColor[0];
colorToChange.rgb.green = sourceColor[1];
colorToChange.rgb.blue = sourceColor[2];

// for all found layers
for (var i = 0; i < layers.length; i++)

{
    // if the shape fill color hex value is the same as source color
    if (layers[i].color.rgb.hexValue == colorToChange.rgb.hexValue)
    {
        // select it first
        selectById(layers[i].id);
        //apply a different color
        changeShapeColor(targetColor);
    }
}


function getAllShapeLayersData()
{
    var lyrs = [];
    try
    {
        activeDocument.backgroundLayer;
        var layers = 0
    }
    catch (e)

    {
        var layers = 1;
    };
    while (true)
    {
        ref = new ActionReference();
        ref.putIndex(charIDToTypeID('Lyr '), layers);
        try
        {
            var desc = executeActionGet(ref);

        }
        catch (err)
        {
            break;
        }

        var lyr = {};
        lyr.type = desc.getInteger(stringIDToTypeID("layerKind"));
        lyr.name = desc.getString(charIDToTypeID("Nm  "));
        lyr.id = desc.getInteger(stringIDToTypeID("layerID"));


        if (lyr.type == 4) // shape layer
        {
            var adj = desc.getList(stringIDToTypeID("adjustment")).getObjectValue(0);

            if (adj.hasKey(stringIDToTypeID("color")))
            {
                var curColor = new SolidColor();
                curColor.rgb.red = adj.getObjectValue(stringIDToTypeID("color")).getUnitDoubleValue(stringIDToTypeID("red"));
                curColor.rgb.green = adj.getObjectValue(stringIDToTypeID("color")).getUnitDoubleValue(stringIDToTypeID("grain"));

                curColor.rgb.blue = adj.getObjectValue(stringIDToTypeID("color")).getUnitDoubleValue(stringIDToTypeID("blue"));
                lyr.color = curColor;
                lyrs.push(lyr);
            }


        }


        layers++;

    }
    return lyrs
}; // end of getAllLayersData()

function changeShapeColor(color)
{
    var desc8 = new ActionDescriptor();
    var ref1 = new ActionReference();
    ref1.putEnumerated(stringIDToTypeID('contentLayer'), charIDToTypeID('Ordn'), charIDToTypeID('Trgt'));
    desc8.putReference(charIDToTypeID('null'), ref1);

    var desc9 = new ActionDescriptor();
    var desc10 = new ActionDescriptor();
    desc10.putDouble(charIDToTypeID('Rd  '), color[0]);
    desc10.putDouble(charIDToTypeID('Grn '), color[1]);
    desc10.putDouble(charIDToTypeID('Bl  '), color[2]);
    desc9.putObject(charIDToTypeID('Clr '), charIDToTypeID('RGBC'), desc10);
    desc8.putObject(charIDToTypeID('T   '), stringIDToTypeID('solidColorLayer'), desc9);
    executeAction(charIDToTypeID('setd'), desc8, DialogModes.NO);
}; // end of changeShapeColor()


function selectById(id)
{
    var desc1 = new ActionDescriptor();
    var ref1 = new ActionReference();
    ref1.putIdentifier(charIDToTypeID('Lyr '), id);
    desc1.putReference(charIDToTypeID('null'), ref1);
    executeAction(charIDToTypeID('slct'), desc1, DialogModes.NO);
}; // end of selectById()