Here is the script I use. The way it works is you choose 2 spots with the color picker tool. Spot 1 is the "good" color and spot 2 is the "bad" color. The script will attempt to use a curves adjustment layer to match the area at spot to with the area at spot one. The variable Avg will give you a radius around each point to average the colors at the spots chosen.
Start with the raster (or smart object) layer selected that contains the colors to compare. Choose your 2 spots. Run the script. This will create a curves adjustment layer above your start layer named similar to your start layer with a number after it. It will also invert the mask on the curves layer. You then unmask the area you wish to "fix" by painting with white on the mask at that area. It's best to use a low flow and/or low opacity and a soft brush in order to blend in around the edges of where you unmask.
What it does is first compares all the channels (red, green, and blue) for each spot and determines the best curves adjustment with the composite channel (all 3 channels combined...this is the main curves you see when you first create a curves adjustment layer). It will then recheck and fine tune any hue/saturation differences by slightly adjusting each channel individually. Let me know if you have any questions.
#target Photoshop
var startRulerUnits = app.preferences.rulerUnits;
var startTypeUnits = app.preferences.typeUnits ;
var startDisplayDialogs = app.displayDialogs;
app.preferences.rulerUnits = Units.PIXELS;
app.preferences.typeUnits = TypeUnits.PIXELS;
app.displayDialogs = DialogModes.NO;
doc=app.activeDocument;
var colorRefin=new SolidColor;
var colorRefout=new SolidColor;
R=new Array;
G=new Array;
B=new Array;
var dialogMode=DialogModes.NO;
Avg=20;
size=[0+" px",0+" px",doc.width,doc.height];
function arrayComp(array1,array2) {
if (array1.length != array2.length) return false;
i=array1.length-1;
while {
if (array1[i] != array2[i]) return false;
i--;
}
return true;
}
// Name the layer with the next higher number available for the given name.
function nameLayer(fromLayer) {
var rlayer=new String(fromLayer.name);
l=rlayer.length-1;
while (l>0) {
if (isNaN(rlayer[l]) || rlayer[l]==" ") break;
l--;
}
l++;
baseLayer=new String(rlayer.substring(0,l));
nl=parseInt(rlayer.substring(l,rlayer.length)) +1;
if (isNaN(nl)) {
l++;
baseLayer=baseLayer+" ";
nl=1;
}
while (isLayer(baseLayer+nl)) nl++;
return baseLayer+nl;
}
// Check to see if a layer by "name" exists.
function isLayer(name) {
i=doc.layers.length-1;
while ((i+1)>0) {
if (doc.layers[i].name == name) return true;
i--;
}
return false;
}
//Get the layer number of a layer
function getLayerNum(reflay) {
i=0;
while (doc.layers[i]) {
if (doc.layers[i] == reflay) return i;
else i++;
}
}
// Find the appropriate Rasterized layer in the stack.
function getRasterLayer(num) {
i=num;
while (doc.layers[i]) {
if ((doc.layers[i].kind == LayerKind.NORMAL || doc.layers[i].kind == LayerKind.SMARTOBJECT) && arrayComp(doc.layers[i].bounds,size)) return doc.layers[i];
else i++;
if (i>doc.layers.length-1) return doc.layers[doc.layers.length-1];
}
return -1;
}
// Set up the new curves layer in the stack and rename it.
function setColorLayer(st,colLayer) {
i=st;
l=1;
refLay=null;
while (doc.layers[i]) {
if (doc.layers[i].name.substring(0,13)=="Color Adj") {
refLay=doc.layers[i];
l++;
}
i--;
if (i<0) break;
}
if (refLay) {
colLayer.name="Color Adj " + l;
colLayer.move(refLay,ElementPlacement.PLACEBEFORE);
}
else colLayer.name="Color Adj 1";
}
function hasSelection(doc) {
if(doc == undefined) doc = activeDocument;
var res = false;
var as = doc.activeHistoryState;
doc.selection.deselect();
if (as != doc.activeHistoryState) {
res = true;
doc.activeHistoryState = as;
}
return res;
}
// Average the colors if needed
function getSelectionColor(s,A){
if (!s) { s=1;}
if (!A) {A=1;}
CP=doc.colorSamplers;
s=s-1;
sampleSize=A;
r=((A-1)/2);
x=Math.round(CP[s].position[0]-r);
y=Math.round(CP[s].position[1]-r);
doc.selection.select([[x, y], [x+sampleSize, y], [x+sampleSize, y+sampleSize], [x, y+sampleSize]], SelectionType.REPLACE, 0, false);
if (doc.activeLayer.kind!=LayerKind.NORMAL) {
doc.selection.copy();
templay=doc.paste(true);
doc.selection.select([[x, y], [x+sampleSize, y], [x+sampleSize, y+sampleSize], [x, y+sampleSize]], SelectionType.REPLACE, 0, false);
templay.applyAverage();
var sColor = new SolidColor();
sColor=CP[s].color;
templay.remove();
}
else {
doc.activeLayer.applyAverage();
var sColor = new SolidColor();
sColor=CP[s].color;
executeAction( charIDToTypeID('undo'), undefined, DialogModes.NO );
}
doc.selection.deselect();
return sColor;
}
// Read from the .ini file if present
function readini() {
var SCRIPTS_FOLDER = new Folder(app.path + '/' + localize("$$$/ScriptingSupport/InstalledScripts=Presets/Scripts"));
ini=new File([SCRIPTS_FOLDER + "/TMAColorAdjust.ini"]);
if (ini.created) {
$.evalFile(ini);
return true;
};
ini.close();
};
// Make Curves Adjustment Layer
function addCurve() {
var desc1 = new ActionDescriptor();
var ref1 = new ActionReference();
ref1.putClass(PSClass.AdjustmentLayer);
desc1.putReference(PSString.Null, ref1);
var desc2 = new ActionDescriptor();
var desc3 = new ActionDescriptor();
desc3.putEnumerated(PSString.presetKind, PSString.presetKindType, PSString.presetKindDefault);
desc2.putObject(PSKey.Type, PSClass.Curves, desc3);
desc1.putObject(PSKey.Using, PSClass.AdjustmentLayer, desc2);
executeAction(PSEvent.Make, desc1, DialogModes.NO);
};
// Set Curves Adjustment Layer
function setCurve(IN,OUT,chan) {
switch (chan) {
case 0:
case null:
curveChan=PSEnum.Composite;
break;
case 1:
curveChan=PSEnum.Red;
break;
case 2:
curveChan=PSEnum.Green;
break;
case 3:
curveChan=PSEnum.Blue;
break;
}
var desc1 = new ActionDescriptor();
var ref1 = new ActionReference();
ref1.putEnumerated(PSClass.AdjustmentLayer, PSType.Ordinal, PSEnum.Target);
desc1.putReference(PSString.Null, ref1);
var desc2 = new ActionDescriptor();
var list1 = new ActionList();
var desc3 = new ActionDescriptor();
var ref2 = new ActionReference();
ref2.putEnumerated(PSClass.Channel, PSClass.Channel, curveChan);
desc3.putReference(PSClass.Channel, ref2);
var list2 = new ActionList();
var desc4 = new ActionDescriptor();
desc4.putDouble(PSKey.Horizontal, 0);
desc4.putDouble(PSKey.Vertical, 0);
list2.putObject(PSClass.Point, desc4);
var desc5 = new ActionDescriptor();
desc5.putDouble(PSKey.Horizontal, IN);
desc5.putDouble(PSKey.Vertical, OUT);
list2.putObject(PSClass.Point, desc5);
var desc6 = new ActionDescriptor();
desc6.putDouble(PSKey.Horizontal, 255);
desc6.putDouble(PSKey.Vertical, 255);
list2.putObject(PSClass.Point, desc6);
desc3.putList(PSKey.Curve, list2);
list1.putObject(PSClass.CurvesAdjustment, desc3);
desc2.putList(PSKey.Adjustment, list1);
desc1.putObject(PSKey.To, PSClass.Curves, desc2);
executeAction(PSEvent.Set, desc1, dialogMode);
}
function setSwatch() {
var desc1 = new ActionDescriptor();
var ref1 = new ActionReference();
ref1.putProperty(PSClass.Color, PSKey.Colors);
desc1.putReference(PSString.Null, ref1);
executeAction(PSEvent.Reset, desc1, DialogModes.NO);
// executeAction(PSEvent.Exchange, desc1, DialogModes.NO);
};
function pickBrush() {
var desc1 = new ActionDescriptor();
var ref1 = new ActionReference();
ref1.putClass(PSClass.PaintbrushTool);
desc1.putReference(PSString.Null, ref1);
executeAction(PSEvent.Select, desc1, DialogModes.NO);
};
function clipPoint(cpin,cpout) {
if (cpin==cpout) return [128,128];
if (cpin>cpout) {
if (cpin > 128) return [cpout,Math.max(Math.min((cpout*3-cpin*2),255),0)];
else return [cpout,Math.max(Math.min((cpout*2-cpin),255),0)];
}
if (cpout>cpin) {
if (cpin<128) return [cpout,Math.max(Math.min((cpin*3-cpout*2),255),0)];
else return [cpout,Math.max(Math.min((cpin*2-cpout2),255),0)];
}
}
function loadVars() {
PSClass = function() {};
PSEnum = function() {};
PSEvent = function() {};
PSForm = function() {};
PSKey = function() {};
PSType = function() {};
PSUnit = function() {};
PSString = function() {};
PSClass.AdjustmentLayer = cTID('AdjL');
PSClass.Channel = cTID('Chnl');
PSClass.Color = cTID('Clr ');
PSClass.Curves = cTID('Crvs');
PSClass.CurvesAdjustment = cTID('CrvA');
PSClass.PaintbrushTool = cTID('PbTl');
PSClass.Point = cTID('Pnt ');
PSEnum.Blue = cTID('Bl ');
PSEnum.Composite = cTID('Cmps');
PSEnum.Green = cTID('Grn ');
PSEnum.Red = cTID('Rd ');
PSEnum.Target = cTID('Trgt');
PSEvent.Invert = cTID('Invr');
PSEvent.Exchange = cTID('Exch');
PSEvent.Make = cTID('Mk ');
PSEvent.Reset = cTID('Rset');
PSEvent.Select = cTID('slct');
PSEvent.Set = cTID('setd');
PSKey.Adjustment = cTID('Adjs');
PSKey.Colors = cTID('Clrs');
PSKey.Curve = cTID('Crv ');
PSKey.Horizontal = cTID('Hrzn');
PSKey.To = cTID('T ');
PSKey.Type = cTID('Type');
PSKey.Using = cTID('Usng');
PSKey.Vertical = cTID('Vrtc');
PSString.Null = sTID('null');
PSString.presetKind = sTID('presetKind');
PSString.presetKindCustom = sTID('presetKindCustom');
PSString.presetKindDefault = sTID('presetKindDefault');
PSString.presetKindType = sTID('presetKindType');
PSType.Ordinal = cTID('Ordn');
};
cTID = function(s) { return app.charIDToTypeID(s); };
sTID = function(s) { return app.stringIDToTypeID(s); };
if (doc.colorSamplers.length ==2) {
if (hasSelection(doc)) {
sel=doc.selection.bounds;
Sel=new Array([sel[0],sel[1]],[sel[2],sel[1]],[sel[2],sel[3]],[sel[0],sel[3]]);
Area=parseInt(((sel[3]-sel[1]+sel[2]-sel[0])/2));
doc.selection.deselect();
}
else sel=false;
actLayer=doc.activeLayer;
// if (actLayer.isBackgroundLayer ) alert("Background Layer");
if (doc.layers.length < 2) actLayer=actLayer.duplicate();
startLayer=getRasterLayer(getLayerNum(doc.activeLayer));
doc.activeLayer=startLayer;
// Check to see if a selection was made. If so, we want to average
// the color for that size area but centered on the Color Picker spot.
// Or, alternately, set Avg (above) to a specific value you wish to use in case of no selection.
// If not, just use the color from the Color Picker itself.
if (sel) {
colorRefin=getSelectionColor(2,Area);
colorRefout=getSelectionColor(1,Area);
}
else if (Avg>1) {
Area=Avg;
colorRefin=getSelectionColor(2,Area);
colorRefout=getSelectionColor(1,Area);
}
else {
colorRefin=doc.colorSamplers[1].color; //Color Sampler #2=Bad Color
colorRefout=doc.colorSamplers[0].color; //Color Sampler #1=Good Color
}
// Reselect original selection in case we want to re-run this with the same average area.
Rin=Math.round(colorRefin.rgb.red);
Gin=Math.round(colorRefin.rgb.green);
Bin=Math.round(colorRefin.rgb.blue);
Rout=Math.round(colorRefout.rgb.red);
Gout=Math.round(colorRefout.rgb.green);
Bout=Math.round(colorRefout.rgb.blue);
loadVars();
curveLayer=addCurve();
if ((Rin+Gin+Bin)>(Rout+Gout+Bout)) {
if (Rin>Gin) {
if (Gin>Bin) {
compIn=Bin;
compOut=Bout;
}
else {
compIn=Gin;
compOut=Gout;
}
}
else {
if (Rin>Bin) {
compIn=Bin;
compOut=Bout;
}
else {
compIn=Rin;
compOut=Rout;
}
}
}
else {
if (Rin<Gin) {
if (Gin<Bin) {
compIn=Bin;
compOut=Bout;
}
else {
compIn=Gin;
compOut=Gout;
}
}
else {
if (Rin<Bin) {
compIn=Bin;
compOut=Bout;
}
else {
compIn=Rin;
compOut=Rout;
}
}
}
setCurve(compIn,compOut,0);
newLayer=doc.activeLayer;
newLayer.name=nameLayer(actLayer);
newLayer.move(actLayer,ElementPlacement.PLACEBEFORE);
doc.activeLayer=startLayer;
colorRefin=doc.colorSamplers[1].color;
doc.activeLayer=newLayer;
Rin=Math.round(colorRefin.rgb.red);
Gin=Math.round(colorRefin.rgb.green);
Bin=Math.round(colorRefin.rgb.blue);
setCurve(Rin,Rout,1);
setCurve(Gin,Gout,2);
setCurve(Bin,Bout,3);
doc.activeLayer=startLayer;
colorRefin=doc.colorSamplers[1].color;
doc.activeLayer=newLayer;
Rdif=Math.round(colorRefin.rgb.red)-Rin;
Gdif=Math.round(colorRefin.rgb.green)-Gin;
Bdif=Math.round(colorRefin.rgb.blue)-Bin;
Rw=Rout-Rin;
Gw=Gout-Gin;
Bw=Bout-Bin;
Rin=Math.round(colorRefin.rgb.red);
Gin=Math.round(colorRefin.rgb.green);
Bin=Math.round(colorRefin.rgb.blue);
if (Rdif!=0) {
Rin=(Rout-(Rw*Rw/Rdif));
setCurve(Rin?Rin:Rout,Rout,1);
}
if (Gdif!=0) {
Gin=(Gout-(Gw*Gw/Gdif));
setCurve(Gin?Gin:Gout,Gout,2);
}
if (Bdif!=0) {
Bin=(Bout-(Bw*Bw/Bdif));
setCurve(Bin?Bin:Bout,Bout,3);
}
newLayer.move(actLayer,ElementPlacement.PLACEBEFORE);
setSwatch();
pickBrush();
executeAction(PSEvent.Invert, undefined, DialogModes.NO);
// if (sel) doc.selection.select(Sel);
};
else alert("You must choose 2 spots using the color picker tool");