From: "Chris Zwar" <AE-List@media-motion.tv>
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Subject: Re: [AE] scripting help - getting colour value
Date: Fri, 4 May 2018 13:13:46 +1000
References: <list-6445232@media-motion.tv>
To: After Effects Mail List <AE-List@media-motion.tv>
In-Reply-To: <list-6445232@media-motion.tv>
Message-Id: <E4F122E3-6F0B-4360-9CCA-40BE697593FC@chriszwar.com>

Thanks for your interest.  Yes your script works fine, and it=E2=80=99s =
prompted me to play around a bit more.  My full script is a few hundred =
lines and I won=E2=80=99t post it all, but I have stripped it down to =
the basics and I=E2=80=99ve found where the problem comes from.
In my full script I am applying the Color Link effect and sampling the =
colour after it is applied.  It=E2=80=99s this effect which is not =
working in CC 2017 or CC 2018.  As an experiment, I tried applying the =
basic fill effect instead, and when I do that the script does work as =
expected.

I=E2=80=99ve pasted a version of the script below. If you leave it =
as-is. the color link effect is applied and the sampleImage only returns =
0.  If you comment out the color link effect to prevent it being added, =
then only the fill effect is applied.  Then the sampleImage correctly =
returns the values of 1,0,0.

I would love to know if you can replicate this behaviour - thanks again.

-Chris

{
    function ZaksTest(thisObj) {     =20
var   ZaksTestData =3D new Object ();
        ZaksTestData.strApply=3D"Apply";
var colourExpression=3D"x=3DthisLayer.width/2;y=3DthisLayer.height/2;\n =
c=3DsampleImage([x,y], radius =3D [2, 2], postEffect =3D true, t =3D =
time);\n c";
// Set up the GUI        =20
        function ZaksTest_buildUI(thisObj) {
            var myPanel =3D (thisObj instanceof Panel) ? thisObj : new =
Window ("palette","ZaksTest",undefined, {resizable:true});
var res =3D=20
				"group { \
					orientation:'column', =
alignment:['fill','top'], \
                                apply: Group { \
                                alignment:['right','top'], \
                                applyBtn: Button { text:'" + =
ZaksTestData.strApply + "' }, \
                                }, \
                            }";          =20
myPanel.grp =3D myPanel.add(res)
var apply=3DmyPanel.grp.apply.applyBtn;
// Apply button - main  part                   =20
apply.onClick=3Dfunction()=20
{
var myComp =3D app.project.activeItem;
app.beginUndoGroup("ZaksTest");
clearOutput();
var myLayer =3D myComp.selectedLayers[0];
myLayer.property("ADBE Effect Parade").addProperty("ADBE Fill");
// comment out the color link effect and the script works.  If it's =
enabled it doesn't //
myLayer.property("ADBE Effect Parade").addProperty("ADBE Color Link");
myLayer.property("ADBE Effect Parade").addProperty("ADBE Color =
Control");
myLayer.property("ADBE Effect Parade").property("ADBE Color =
Control").property("ADBE Color =
Control-0001").expression=3DcolourExpression;
var RGB=3D[1,1,1,1];
var r=3D0;g=3D0;b=3D0;
RGB=3DmyLayer.property("ADBE Effect Parade").property("ADBE Color =
Control")(1).value;
r=3DRGB[0];
g=3DRGB[1];
b=3DRGB[2];
alert("RGB: "+r+","+g+","+b);
app.endUndoGroup();
}
// Set panel resizing
myPanel.layout.layout (true);
myPanel.grp.minimumSize=3DmyPanel.grp.size;
myPanel.layout.resize();
myPanel.onResizing =3D myPanel.onResize=3D function () =
{this.layout.resize()}
           return myPanel;
                                }
var ZaksTestPal =3D ZaksTest_buildUI(thisObj);         =20
        if ((ZaksTestPal !=3D null) && (ZaksTestPal instanceof Window))
        {
            ZaksTestPal.center();
            ZaksTestPal.show();
        }
    }
ZaksTest(this) ;
}=