Get color from selected area

Question

Hello.Please help in solving the following problem: I need to pick up color with a dropper from a pre-selected randomly shaped area, probably quite small relative to the image and having no known position on the canvas, the current layer.This needs to be done automatically, without manual clicks. I haven't found ways to do this in PS itself without human intervention, and I have no experience in scripting, but scripting seems to be the correct solution to the problem. It would be great to have a ready-made script for such an operation. Thank.

r-bin · Accepted Answer

function get_average_color(color)

from here: Auto picking the most distinct accent color from an image

UPD.

Короче. По ссылке - глючная реплика со старого форума, скрипты там все нерабочие.

Вот готовый скрипт.

get_average_color(app.foregroundColor);

////////////////////////////////////////////////////////////
function get_average_color(color, x, y)
    {
    try {
        if (x != undefined && y != undefined) app.activeDocument.selection.select([[x,y],[x+1,y],[x+1,y+1],[x,y+1]], SelectionType.REPLACE); 
        
        var chnl = 3;
        if (app.activeDocument.mode == DocumentMode.CMYK) chnl = 4;

        if (app.activeDocument.mode == DocumentMode.GRAYSCALE) chnl = 1;

        var lm = new Array();
        var px = new Array();

        for (var i = 0; i < chnl; i++)
            {
            var hst = get_histogram(i+1);
            var l = 0;
            var p = 0;

            if (!hst) { return false; }

            for (var n in hst) { l += hst[n] * n; p += hst[n]; }  

            hst = null;

            lm.push(l);
            px.push(p);
            }

        if (app.activeDocument.mode == DocumentMode.RGB)
            {
            var r =lm[0]/px[0]; 
            var g =lm[1]/px[1]; 
            var b =lm[2]/px[2];

            with (color.rgb) { red = Math.round(r); green = Math.round(g); blue = Math.round(b); };
            }
        else if (app.activeDocument.mode == DocumentMode.LAB)
            {
            var _l = lm[0]/px[0] * 100/255; 
            var _a = lm[1]/px[1] - 128; 
            var _b = lm[2]/px[2] - 128;

            with (color.lab) { l = Math.round(_l); a = Math.round(_a); b = Math.round(_b); };
            }
        else if (app.activeDocument.mode == DocumentMode.CMYK)
            {
            var c = 100 - lm[0]/px[0] * 100/255; 
            var m = 100 - lm[1]/px[1] * 100/255; 
            var y = 100 - lm[2]/px[2] * 100/255;
            var k = 100 - lm[3]/px[3] * 100/255;

            with (color.cmyk) { cyan = Math.round(c); magenta = Math.round(m); yellow = Math.round(y); black = Math.round(k); };
            }
        else if (app.activeDocument.mode == DocumentMode.GRAYSCALE)
            {
            var _l = 100 - lm[0]/px[0] * 100/255; 

            with (color.gray) { gray = Math.round(_l);  };
            }
        else { alert("Unsupported color mode", "Error", true); return false; }

        if (x != undefined && y != undefined) app.activeDocument.selection.deselect();

        return true;
        }
    catch (e) { alert(e); }
    }

////////////////////////////////////////////////////////////
function get_histogram(n)
    {
    try {
        var r = new ActionReference();
        r.putProperty(stringIDToTypeID("property"), stringIDToTypeID("histogram"));

        if (typeof(n) == "string")
            r.putName(stringIDToTypeID("channel"), n);
        else
            {
            if (app.activeDocument.mode == DocumentMode.RGB)
                {
                switch (n)
                    {       
                    case -1: r.putEnumerated(stringIDToTypeID("document"), stringIDToTypeID("ordinal"), stringIDToTypeID("targetEnum")); break;

                    case 0:  r.putEnumerated(stringIDToTypeID("channel"), stringIDToTypeID("channel"), stringIDToTypeID("RGB"  )); break;
                    case 1:  r.putEnumerated(stringIDToTypeID("channel"), stringIDToTypeID("channel"), stringIDToTypeID("red"  )); break;
                    case 2:  r.putEnumerated(stringIDToTypeID("channel"), stringIDToTypeID("channel"), stringIDToTypeID("green")); break;
                    case 3:  r.putEnumerated(stringIDToTypeID("channel"), stringIDToTypeID("channel"), stringIDToTypeID("blue" )); break;
   
                    default: r.putEnumerated(stringIDToTypeID("channel"), stringIDToTypeID("ordinal"), stringIDToTypeID("targetEnum")); break;
                    }
                }
            else if (app.activeDocument.mode == DocumentMode.LAB)
                {
                switch (n)
                    {
                    case -1: 
                    case 0:  r.putEnumerated(stringIDToTypeID("channel"), stringIDToTypeID("channel"), stringIDToTypeID("lab"      )); break;
                    case 1:  r.putEnumerated(stringIDToTypeID("channel"), stringIDToTypeID("channel"), stringIDToTypeID("lightness")); break;
                    case 2:  r.putEnumerated(stringIDToTypeID("channel"), stringIDToTypeID("channel"), stringIDToTypeID("a"        )); break;
                    case 3:  r.putEnumerated(stringIDToTypeID("channel"), stringIDToTypeID("channel"), stringIDToTypeID("b"        )); break;
   
                    default: r.putEnumerated(stringIDToTypeID("channel"), stringIDToTypeID("ordinal"), stringIDToTypeID("targetEnum")); break;
                    }
                }
            else if (app.activeDocument.mode == DocumentMode.CMYK)
                {
                switch (n)
                    {
                    case -1: r.putEnumerated(stringIDToTypeID("document"), stringIDToTypeID("ordinal"), stringIDToTypeID("targetEnum")); break;

                    case 0:  r.putEnumerated(stringIDToTypeID("channel"), stringIDToTypeID("channel"), stringIDToTypeID("CMYK"   )); break;
                    case 1:  r.putEnumerated(stringIDToTypeID("channel"), stringIDToTypeID("channel"), stringIDToTypeID("cyan"   )); break;
                    case 2:  r.putEnumerated(stringIDToTypeID("channel"), stringIDToTypeID("channel"), stringIDToTypeID("magenta")); break;
                    case 3:  r.putEnumerated(stringIDToTypeID("channel"), stringIDToTypeID("channel"), stringIDToTypeID("yellow" )); break;
                    case 4:  r.putEnumerated(stringIDToTypeID("channel"), stringIDToTypeID("channel"), stringIDToTypeID("black"  )); break;
   
                    default: r.putEnumerated(stringIDToTypeID("channel"), stringIDToTypeID("ordinal"), stringIDToTypeID("targetEnum")); break;
                    }
                }
            else if (app.activeDocument.mode == DocumentMode.GRAYSCALE)
                {
                switch (n)
                    {
                    case -1: 
                    case 0:  r.putEnumerated(stringIDToTypeID("channel"),  stringIDToTypeID("channel"), stringIDToTypeID("black")); break;
   
                    default: r.putEnumerated(stringIDToTypeID("channel"), stringIDToTypeID("ordinal"), stringIDToTypeID("targetEnum")); break;
                    }
                }

            else { alert("Unsupported color mode", "Error", true); return null; }
            }

        var ret;

        try { ret = executeActionGet(r).getList(stringIDToTypeID("histogram")); } catch (e) { alert(e); return null; }

        var hist = new Array();
        for (var i = 0; i < 256; i++) hist.push(ret.getInteger(i));

        return hist;
        }
    catch (e) { alert(e); return null; }
    }

JJMack · Answer

I do not think a without a click to set a color sampler to the pixel a script can. What do you know about the shape layer? Do you know where in the Layer stack the shape layers is and what kind of a fill layer the shape layer is? A script can get the bounds of a shape layer. Get the Paths of a shape layer there can be many path item for various close path in the layer's vector mask that combine in various ways, A shape layers combined path can be stroked on the path, outside the path or inside the path and the stroke can be wide, So Pixels in the shape layer can very in color if its not a solid fill shape and part of the fill can be overlaid with a stroke. So you must know the fill is a solid color and where the x,y of an untainted pixels in the shape is.

A script need to coded with some logic the will get the pixel in the shape you want to sample. Once the script knows the Pixel's x,y it could set a color sampler to get that pixel color.

A selection is quite like a shape how would you know which x,y pixel in the has the color you want to sample,

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