How to apply BitmapConversionOptions to Bitmap

[artmelkon]

Hello there,

I was trying to convert a grayscale image to bitmap and can't move forward as couldn't find any documentation how to utilize BitmapConversionOption superclass.

This is what my script like.

#target photoshop

var doc = app.activeDocument;

doc.changeMode(ChangeMode.GRAYSCALE);

doc.changeMode(ChangeMode.BITMAP);

And from this point on I can't figure out to proceed with BtimapConversionOptions, to pass the parameters. Anyone can shed some light on this issue? It will be greatly appriciated

[JJMack]

Have you looked at Adobe conditional mode change script.  Menu File>Automate>Conditional Mode Change?  I do not know how it works and  do not even see a .changeMode() in the script but it does seem to change the document mode. It may have  the code you want. 

[Stephen_A_Marsh · Accepted solution]

The bitmapConversionOptions are listed in the JavaScript Reference PDF for standard DOM coding. If the syntax is an issue, you could fast-track the process by recording AM code via the ScriptingListener plugin.

Edit - some searching came up with this DOM code:

var bitSaveOptions = new BitmapConversionOptions();
bitSaveOptions.method = BitmapConversionType.HALFTONESCREEN;
bitSaveOptions.angle = 45;
bitSaveOptions.frequency = 55;
bitSaveOptions.resolution = 300;
bitSaveOptions.shape = BitmapHalfToneType.ROUND;

app.activeDocument.changeMode(ChangeMode.BITMAP,bitSaveOptions);

[artmelkon]

Thanks a lot, it solved my issue. I did read the documentation, but wasn't quire sure how to implement it.

[Stephen_A_Marsh]

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@artmelkon wrote:

Thanks a lot, it solved my issue. I did read the documentation, but wasn't quire sure how to implement it.

---

Yes, it can be hard to get the syntax right without an example, which is why I suggested taking the easy way out and using AM code recorded via the ScriptingListener plugin:

var idconvertMode = stringIDToTypeID( "convertMode" );
    var desc180 = new ActionDescriptor();
    var idto = stringIDToTypeID( "to" );
        var desc181 = new ActionDescriptor();
        var idresolution = stringIDToTypeID( "resolution" );
        var iddensityUnit = stringIDToTypeID( "densityUnit" );
        desc181.putUnitDouble( idresolution, iddensityUnit, 300.000000 );
        var idmethod = stringIDToTypeID( "method" );
        var idmethod = stringIDToTypeID( "method" );
        var idhalftoneScreen = stringIDToTypeID( "halftoneScreen" );
        desc181.putEnumerated( idmethod, idmethod, idhalftoneScreen );
        var idfrequency = stringIDToTypeID( "frequency" );
        var iddensityUnit = stringIDToTypeID( "densityUnit" );
        desc181.putUnitDouble( idfrequency, iddensityUnit, 55.000000 );
        var idangle = stringIDToTypeID( "angle" );
        var idangleUnit = stringIDToTypeID( "angleUnit" );
        desc181.putUnitDouble( idangle, idangleUnit, 45.000000 );
        var idshape = stringIDToTypeID( "shape" );
        var idshape = stringIDToTypeID( "shape" );
        var idround = stringIDToTypeID( "round" );
        desc181.putEnumerated( idshape, idshape, idround );
    var idbitmapMode = stringIDToTypeID( "bitmapMode" );
    desc180.putObject( idto, idbitmapMode, desc181 );
executeAction( idconvertMode, desc180, DialogModes.NO );

[Lumigraphics]