Color Lookup

undavide · Post by **undavide** » Sun Jul 08, 2012 12:57 pm

Have you ever noticed that you can't ask a Color Lookup adjustment layer (CS6 only) which kind it is?
There are supported kinds ranging from LayerKind.BLACKANDWHITE to LayerKind.VIDEO (in alphabetic order), yet if you try:

Code: Select all$.writeln(app.activeDocument.activeLayer.kind)

on a Color Lookup adjustment layer it gives you an internal error. Weird.

Davide

Mike Hale · Post by **Mike Hale** » Sun Jul 08, 2012 2:47 pm

Yes, in another thread Paul pointed out that you can't get it with Action Manager either. I don't have CS6 but I wonder if you could tell by looking at the raw adjustment data.

undavide · Post by **undavide** » Sun Jul 08, 2012 3:52 pm

Mike,
as far as I can tell (and with the invaluable help of Jacob ), with action manager you can do it.

Code: Select allvar isColorLookup = function() {
var selected_layer_ref = new ActionReference();
selected_layer_ref.putEnumerated(app.stringIDToTypeID('contentLayer'), app.stringIDToTypeID('ordinal'), app.stringIDToTypeID('targetEnum'));
var adjustment_type = adjustmentTypeForLayerRef(selected_layer_ref);
if (app.typeIDToStringID(adjustment_type) == "colorLookup") {
return true;
}
else {
return false;
}
}

var adjustmentTypeForLayerRef = function(layer_ref) {
var layer_desc;
var adjustment_list;

try {
layer_desc = app.executeActionGet(layer_ref);
} catch(error) {
$.writeln("Error: " + error.message);
return;
}

if (!layer_desc.hasKey(app.stringIDToTypeID('adjustment'))) {
return;
}
adjustment_list = layer_desc.getList(app.stringIDToTypeID('adjustment'));
if (adjustment_list.count == 0) {
return;
}
return adjustment_list.getObjectType(0);
}

isColorLookup();

Davide

Paul MR · Post by **Paul MR** » Sun Jul 08, 2012 3:56 pm

I have logged this as a bug with Adobe.

jacobolus · Post by **jacobolus** » Mon Jul 09, 2012 10:30 am

There was none of my help here! Davide figured this one out himself, and deserves all the credit.

Anyway, as Davide’s code points out, you can get it by looking at the type of the first descriptor in the 'adjustment' list.

Here’s my serialization of a descriptor for a Color Lookup adjustment layer:

Code: Select all$desc {
name: 'Color Lookup 1'
color: $enum 'color.none'
visible: true
mode: $enum 'blendMode.normal'
opacity: $int 255
layerID: $int 3
itemIndex: $int 2
count: $int 3
preserveTransparency: false
userMaskEnabled: true
userMaskLinked: true
layerFXVisible: false
globalAngle: $int 120
background: false
layerSection: $enum 'layerSectionType.layerSectionContent'
layerLocking: $desc 'layerLocking', {
protectTransparency: false
protectComposite: false
protectPosition: false
protectAll: false
}
group: false
targetChannels: $list [
$ref.index('channel', 4)
]
visibleChannels: $list [
$ref.index('channel', 1)
$ref.index('channel', 2)
$ref.index('channel', 3)
]
channelRestrictions: $list [
$enum 'channel.lightness'
$enum 'channel.a'
$enum 'channel.b'
]
fillOpacity: $int 255
hasUserMask: true
hasVectorMask: false
hasFilterMask: false
userMaskDensity: $int 255
userMaskFeather: 0
vectorMaskDensity: $int 255
vectorMaskFeather: 0
adjustment: $list [
$desc 'colorLookup', {
legacyContentData: $data ... giant blob of profile data
}
]
bounds: $desc 'rectangle', {
top: $unit 'pixelsUnit', 0
left: $unit 'pixelsUnit', 0
bottom: $unit 'pixelsUnit', 360
right: $unit 'pixelsUnit', 504
}
useAlignedRendering: false
}

The actual data inside the legacyContentData blob consists of a descriptor itself, which looks like:

Code: Select all$desc {
lookupType: $enum 'colorLookupType.abstractProfile'
name: 'Blue Tone'
dither: true
profile: $data ... 30 kb of raw data
}

Mike Hale · Post by **Mike Hale** » Mon Jul 09, 2012 1:25 pm

Yes, I misread the post from Paul. It's not that you can't determine the type of layer using Action Manager. It's the layer kind enum for that layer type that is missing from the DOM.