From: "Chris Zwar" <AE-List@media-motion.tv>
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Subject: Re: [AE] scripting help - getting colour value
Date: Thu, 3 May 2018 10:51:18 +1000
References: <list-6444722@media-motion.tv>
To: After Effects Mail List <AE-List@media-motion.tv>
In-Reply-To: <list-6444722@media-motion.tv>
Message-Id: <1337319D-93B7-4EA2-8FC0-B87A3EAA58E9@chriszwar.com>

I=E2=80=99ll have a look at using a variable but it=E2=80=99s simpler if =
I don=E2=80=99t have to. =20

The thing that stumps me is that the script works if run from the =
scripts menu, it just doesn=E2=80=99t work when opened from the windows =
menu.

I had a quick play yesterday and I changed the .value to =
.valueAtTime(time, false).  The =E2=80=9Cfalse=E2=80=9D flag is supposed =
to force the return of the expression and not the underlying =
pre-expression value.  It still doesn=E2=80=99t work.  The colour =
control that is applied by the script works as expected after the script =
has run, so there=E2=80=99s no issue with the script applying the effect =
and the expression.

I=E2=80=99ll try using a slider instead but I appreciate any other =
suggestions...

> On 3 May 2018, at 7:09 am, TIM THIESSEN <AE-List@media-motion.tv> =
wrote:
>=20
> I'm thinking the problem is you are applying an expression to the =
controller and then asking the value of the controller - the problem is =
that if you apply an expression to say position and then ask the for the =
value it returns the default position. rather than add the expression to =
sample the color just create a variable to sample the point you need and =
then it will return the correct color. I don't know your whole =
application so that may not be possible, and the last time I tried =
sampleImage() I had some weird colors show up.
>=20
> tt
>=20
>> On April 30, 2018 at 10:29 PM Chris Zwar <AE-List@media-motion.tv> =
wrote:
>>=20
>>=20
>> Hi,
>>=20
>> Just after some scripting help.  I have a simple script that works =
fine when run without a GUI, but if I use exactly the same code in a =
version with a GUI it doesn=E2=80=99t work any more.
>>=20
>> The aim is to sample the colour of a layer.  The script applies a =
colour control / expression control effect, with an expression that uses =
sampleImage to read the RGB values.  The script then reads the value of =
the colour control to get the RGB values.
>>=20
>> As I said - works fine if I run the script from the scripts menu.  =
But the same thing in a GUI and run from the ScriptsUI Panel doesn=E2=80=99=
t work. The RGB array variable is just 0. So what am I doing wrong?
>>=20
>> Cheers,
>>=20
>>=20
>> -Chris
>>=20
>> Offending code:
>>=20
>> myLayer[0].property("ADBE Effect Parade").addProperty("ADBE Color =
Control=E2=80=9D);
>>=20
>> myLayer[0].property("ADBE Effect Parade").property("ADBE Color =
Control").property("ADBE Color =
Control-0001").expression=3D"x=3DthisLayer.width/2;y=3DthisLayer.height/2;=
 c=3DsampleImage([x,y], radius =3D [2, 2], postEffect =3D true, t =3D =
time);";
>>=20
>> var RGB=3DmyLayer[0].property("ADBE Effect Parade").property("ADBE =
Color Control").property("ADBE Color Control-0001").value;
>>=20
>>=20
>> +---End of message---+
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>=20
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