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i24729867ptv1
Participant
Oct 25, 2026 3:12 PM UTC
Answered

Is there an official ExtendScript API to detect opacity masks, live effects, and complex appearances on Illustrator objects without installing a plug-in?

Hello,

I am developing a standalone macOS application that generates JAN/EAN-13 barcodes and integrates with Adobe Illustrator.

The application uses Apple Events to execute ExtendScript in Illustrator. I am investigating how to safely identify simple rectangle objects before performing automatic barcode fitting.

My primary concern is avoiding unintended changes to existing Illustrator artwork.

Environment

  • Adobe Illustrator 2025 (29.8.11)

  • macOS Sonoma

  • ExtendScript executed through Apple Events

  • Illustrator 2026 support is also being considered

What I have tested

I created four test cases:

A. A normal rectangle (PathItem)

B. A rectangle with an opacity mask

C. A rectangle with a live "Round Corners" effect

D. A clipping group containing a clipping path

Using the public ExtendScript DOM, I examined properties including:

  • typename

  • clipping / clipped

  • filled / stroked

  • opacity

  • blendingMode

  • parent hierarchy

In my tests, cases B and C returned essentially identical values for these basic properties, despite having different appearances.

For example, both were reported as PathItem objects with:

  • clipping = false

  • opacity = 100

  • blendingMode = BlendModes.NORMAL

The clipping group in case D could be identified using GroupItem.clipped and PathItem.clipping.

However, I have not found a reliable public ExtendScript API to determine whether a PathItem has an opacity mask, live effect, or additional appearance attributes.

My questions

  1. Is there an official ExtendScript API that can reliably detect opacity masks applied to PathItem objects?

  2. Can ExtendScript determine whether an object has live effects or multiple fills/strokes in its Appearance panel?

  3. Is there an official way to inspect the complete appearance of an object, including relevant parent objects or layers?

  4. Can this information be obtained from an external macOS application without installing an Illustrator plug-in or extension?

  5. If these capabilities are not available through ExtendScript, is there another officially supported scripting interface for this purpose?

I understand that the Illustrator C++ SDK may provide additional access to art styles and masks, but my application must work without requiring users to install an Illustrator plug-in.

The goal is to reject unsupported objects rather than modify them.

I am specifically looking for a read-only way to verify object eligibility before any modification is attempted.

Any guidance or references to official documentation would be greatly appreciated.

Thank you.

 

[Moved to Illustrator by a moderator］

    Ten A
    Ten ACorrect answer
    Community Expert
    Oct 25, 2026 11:42 PM UTC
    Properties
    closed : true
    area : 7776.5625
    length : 355
    guides : false
    filled : true
    fillColor : [CMYKColor]
    fillColor.cyan : 0
    fillColor.magenta : 0
    fillColor.yellow : 0
    fillColor.black : 0
    fillColor.typename : CMYKColor
    fillOverprint : false
    stroked : true
    strokeColor : [CMYKColor]
    strokeColor.cyan : 0
    strokeColor.magenta : 0
    strokeColor.yellow : 0
    strokeColor.black : 100
    strokeColor.typename : CMYKColor
    strokeOverprint : false
    strokeWidth : 1
    strokeDashes : 
    strokeDashOffset : 0
    strokeCap : StrokeCap.BUTTENDCAP
    strokeJoin : StrokeJoin.MITERENDJOIN
    strokeMiterLimit : 10
    clipping : false
    evenodd : false
    resolution : 800
    selectedPathPoints : [PathPoint],[PathPoint],[PathPoint],[PathPoint]
    selectedPathPoints.0 : [PathPoint]
    selectedPathPoints.1 : [PathPoint]
    selectedPathPoints.2 : [PathPoint]
    selectedPathPoints.3 : [PathPoint]
    polarity : PolarityValues.POSITIVE
    pathPoints : [PathPoints]
    pathPoints.length : 4
    pathPoints.parent : [PathItem ]
    pathPoints.length : 4
    pathPoints.typename : PathPoints
    typename : PathItem
    uRL : 
    note : 
    layer : [Layer レイヤー 1]
    layer.visible : true
    layer.locked : false
    layer.printable : true
    layer.hasSelectedArtwork : true
    layer.preview : true
    layer.dimPlacedImages : false
    layer.color : [RGBColor]
    layer.name : レイヤー 1
    layer.opacity : 100
    layer.zOrderPosition : 1
    layer.absoluteZOrderPosition : 2
    layer.sliced : false
    layer.blendingMode : BlendModes.NORMAL
    layer.isIsolated : false
    layer.artworkKnockout : KnockoutState.INHERITED
    layer.compoundPathItems : [CompoundPathItems]
    layer.pageItems : [PageItems]
    layer.pathItems : [PathItems]
    layer.rasterItems : [RasterItems]
    layer.placedItems : [PlacedItems]
    layer.meshItems : [MeshItems]
    layer.pluginItems : [PluginItems]
    layer.graphItems : [GraphItems]
    layer.nonNativeItems : [NonNativeItems]
    layer.groupItems : [GroupItems]
    layer.textFrames : [TextFrames]
    layer.layers : [Layers]
    layer.symbolItems : [SymbolItems]
    layer.legacyTextItems : [LegacyTextItems]
    layer.symmetryRepeatItems : [SymmetryRepeatItems]
    layer.radialRepeatItems : [RadialRepeatItems]
    layer.gridRepeatItems : [GridRepeatItems]
    layer.typename : Layer
    layer.parent : [Document 名称未設定-1]
    locked : false
    hidden : false
    selected : true
    position : 161.75,-159.125
    position.0 : 161.75
    position.1 : -159.125
    width : 98.75
    height : 78.75
    geometricBounds : 161.75,-159.125,260.5,-237.875
    geometricBounds.0 : 161.75
    geometricBounds.1 : -159.125
    geometricBounds.2 : 260.5
    geometricBounds.3 : -237.875
    visibleBounds : 153.24,-150.6,283.08,-260.52
    visibleBounds.0 : 153.24
    visibleBounds.1 : -150.6
    visibleBounds.2 : 283.08
    visibleBounds.3 : -260.52
    controlBounds : 153.24,-150.6,283.08,-260.52
    controlBounds.0 : 153.24
    controlBounds.1 : -150.6
    controlBounds.2 : 283.08
    controlBounds.3 : -260.52
    name : 
    uuid : 745
    blendingMode : BlendModes.NORMAL
    opacity : 100
    isIsolated : false
    artworkKnockout : KnockoutState.DISABLED
    zOrderPosition : 1
    absoluteZOrderPosition : 1
    editable : true
    sliced : false
    top : -150.6
    left : 153.24
    visibilityVariable : null
    visibilityVariable : NA
    tags : [Tags]
    tags.length : 0
    tags.parent : [PathItem ]
    tags.length : 0
    tags.typename : Tags
    pixelAligned : false
    wrapped : false
    wrapOffset : NA
    wrapInside : NA
    parent : [Layer レイヤー 1]
    parent.visible : true
    parent.locked : false
    parent.printable : true
    parent.hasSelectedArtwork : true
    parent.preview : true
    parent.dimPlacedImages : false
    parent.color : [RGBColor]
    parent.name : レイヤー 1
    parent.opacity : 100
    parent.zOrderPosition : 1
    parent.absoluteZOrderPosition : 2
    parent.sliced : false
    parent.blendingMode : BlendModes.NORMAL
    parent.isIsolated : false
    parent.artworkKnockout : KnockoutState.INHERITED
    parent.compoundPathItems : [CompoundPathItems]
    parent.pageItems : [PageItems]
    parent.pathItems : [PathItems]
    parent.rasterItems : [RasterItems]
    parent.placedItems : [PlacedItems]
    parent.meshItems : [MeshItems]
    parent.pluginItems : [PluginItems]
    parent.graphItems : [GraphItems]
    parent.nonNativeItems : [NonNativeItems]
    parent.groupItems : [GroupItems]
    parent.textFrames : [TextFrames]
    parent.layers : [Layers]
    parent.symbolItems : [SymbolItems]
    parent.legacyTextItems : [LegacyTextItems]
    parent.symmetryRepeatItems : [SymmetryRepeatItems]
    parent.radialRepeatItems : [RadialRepeatItems]
    parent.gridRepeatItems : [GridRepeatItems]
    parent.typename : Layer
    parent.parent : [Document 名称未設定-1]

    First, shown here is the complete list of properties—accessible via JavaScript—for a rectangle object with an applied Stylize > drop shadow.
    As you can see, any information related to "appearance" is entirely absent.
    While scripting-related documentation is available on the developer website, the definitive source for JavaScript-specific information can be found locally at:

    (macOS)  /Library/Application Support/Adobe/Scripting Dictionaries CC/Illustrator 2026/omv.xml

    As you are likely aware, manipulating attributes such as "appearance" requires interacting with libraries contained within the native objects; the only way to achieve this is by developing a plug-in.

    UXP is scheduled to be implemented next year, so for now, that is the only thing we can look forward to.

    View reply

    2 replies

    lgrovers
    lgrovers
    Participating Frequently
    Oct 26, 2026 1:46 AM UTC

    Thanks, Ten-A

    Translate
    Ten A
    Community Expert
    Ten ACommunity ExpertCorrect answer
    Community Expert
    Oct 25, 2026 11:42 PM UTC
    Properties
    closed : true
    area : 7776.5625
    length : 355
    guides : false
    filled : true
    fillColor : [CMYKColor]
    fillColor.cyan : 0
    fillColor.magenta : 0
    fillColor.yellow : 0
    fillColor.black : 0
    fillColor.typename : CMYKColor
    fillOverprint : false
    stroked : true
    strokeColor : [CMYKColor]
    strokeColor.cyan : 0
    strokeColor.magenta : 0
    strokeColor.yellow : 0
    strokeColor.black : 100
    strokeColor.typename : CMYKColor
    strokeOverprint : false
    strokeWidth : 1
    strokeDashes : 
    strokeDashOffset : 0
    strokeCap : StrokeCap.BUTTENDCAP
    strokeJoin : StrokeJoin.MITERENDJOIN
    strokeMiterLimit : 10
    clipping : false
    evenodd : false
    resolution : 800
    selectedPathPoints : [PathPoint],[PathPoint],[PathPoint],[PathPoint]
    selectedPathPoints.0 : [PathPoint]
    selectedPathPoints.1 : [PathPoint]
    selectedPathPoints.2 : [PathPoint]
    selectedPathPoints.3 : [PathPoint]
    polarity : PolarityValues.POSITIVE
    pathPoints : [PathPoints]
    pathPoints.length : 4
    pathPoints.parent : [PathItem ]
    pathPoints.length : 4
    pathPoints.typename : PathPoints
    typename : PathItem
    uRL : 
    note : 
    layer : [Layer レイヤー 1]
    layer.visible : true
    layer.locked : false
    layer.printable : true
    layer.hasSelectedArtwork : true
    layer.preview : true
    layer.dimPlacedImages : false
    layer.color : [RGBColor]
    layer.name : レイヤー 1
    layer.opacity : 100
    layer.zOrderPosition : 1
    layer.absoluteZOrderPosition : 2
    layer.sliced : false
    layer.blendingMode : BlendModes.NORMAL
    layer.isIsolated : false
    layer.artworkKnockout : KnockoutState.INHERITED
    layer.compoundPathItems : [CompoundPathItems]
    layer.pageItems : [PageItems]
    layer.pathItems : [PathItems]
    layer.rasterItems : [RasterItems]
    layer.placedItems : [PlacedItems]
    layer.meshItems : [MeshItems]
    layer.pluginItems : [PluginItems]
    layer.graphItems : [GraphItems]
    layer.nonNativeItems : [NonNativeItems]
    layer.groupItems : [GroupItems]
    layer.textFrames : [TextFrames]
    layer.layers : [Layers]
    layer.symbolItems : [SymbolItems]
    layer.legacyTextItems : [LegacyTextItems]
    layer.symmetryRepeatItems : [SymmetryRepeatItems]
    layer.radialRepeatItems : [RadialRepeatItems]
    layer.gridRepeatItems : [GridRepeatItems]
    layer.typename : Layer
    layer.parent : [Document 名称未設定-1]
    locked : false
    hidden : false
    selected : true
    position : 161.75,-159.125
    position.0 : 161.75
    position.1 : -159.125
    width : 98.75
    height : 78.75
    geometricBounds : 161.75,-159.125,260.5,-237.875
    geometricBounds.0 : 161.75
    geometricBounds.1 : -159.125
    geometricBounds.2 : 260.5
    geometricBounds.3 : -237.875
    visibleBounds : 153.24,-150.6,283.08,-260.52
    visibleBounds.0 : 153.24
    visibleBounds.1 : -150.6
    visibleBounds.2 : 283.08
    visibleBounds.3 : -260.52
    controlBounds : 153.24,-150.6,283.08,-260.52
    controlBounds.0 : 153.24
    controlBounds.1 : -150.6
    controlBounds.2 : 283.08
    controlBounds.3 : -260.52
    name : 
    uuid : 745
    blendingMode : BlendModes.NORMAL
    opacity : 100
    isIsolated : false
    artworkKnockout : KnockoutState.DISABLED
    zOrderPosition : 1
    absoluteZOrderPosition : 1
    editable : true
    sliced : false
    top : -150.6
    left : 153.24
    visibilityVariable : null
    visibilityVariable : NA
    tags : [Tags]
    tags.length : 0
    tags.parent : [PathItem ]
    tags.length : 0
    tags.typename : Tags
    pixelAligned : false
    wrapped : false
    wrapOffset : NA
    wrapInside : NA
    parent : [Layer レイヤー 1]
    parent.visible : true
    parent.locked : false
    parent.printable : true
    parent.hasSelectedArtwork : true
    parent.preview : true
    parent.dimPlacedImages : false
    parent.color : [RGBColor]
    parent.name : レイヤー 1
    parent.opacity : 100
    parent.zOrderPosition : 1
    parent.absoluteZOrderPosition : 2
    parent.sliced : false
    parent.blendingMode : BlendModes.NORMAL
    parent.isIsolated : false
    parent.artworkKnockout : KnockoutState.INHERITED
    parent.compoundPathItems : [CompoundPathItems]
    parent.pageItems : [PageItems]
    parent.pathItems : [PathItems]
    parent.rasterItems : [RasterItems]
    parent.placedItems : [PlacedItems]
    parent.meshItems : [MeshItems]
    parent.pluginItems : [PluginItems]
    parent.graphItems : [GraphItems]
    parent.nonNativeItems : [NonNativeItems]
    parent.groupItems : [GroupItems]
    parent.textFrames : [TextFrames]
    parent.layers : [Layers]
    parent.symbolItems : [SymbolItems]
    parent.legacyTextItems : [LegacyTextItems]
    parent.symmetryRepeatItems : [SymmetryRepeatItems]
    parent.radialRepeatItems : [RadialRepeatItems]
    parent.gridRepeatItems : [GridRepeatItems]
    parent.typename : Layer
    parent.parent : [Document 名称未設定-1]

    First, shown here is the complete list of properties—accessible via JavaScript—for a rectangle object with an applied Stylize > drop shadow.
    As you can see, any information related to "appearance" is entirely absent.
    While scripting-related documentation is available on the developer website, the definitive source for JavaScript-specific information can be found locally at:

    (macOS)  /Library/Application Support/Adobe/Scripting Dictionaries CC/Illustrator 2026/omv.xml

    As you are likely aware, manipulating attributes such as "appearance" requires interacting with libraries contained within the native objects; the only way to achieve this is by developing a plug-in.

    UXP is scheduled to be implemented next year, so for now, that is the only thing we can look forward to.

    Translate
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