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Question

How to get Brightness/Contrast levels of a layer, using .jsx Adobe Photoshop scripting?

Forum|Forum|2 years ago
June 25, 2023
1 reply
1118 views

I have a .jsx Photoshop script workflow that begins by first applying a Brightness/Contrast adjustment to the current image, then uses the "Auto" setting.

For the next step, I'd like to get the properties of that Brightness/Contrast layer, and then IF the brightness meets a certain criteria? Change the brightness to some other value. Same for the contrast.

What's the best way to automate this in my .jsx file?

Thanks!

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c.pfaffenbichler

Community Expert

You should be able to get the Layer’s settings via AM-code.

T

the_king_of_goatsAuthor

Known Participant

Any idea what that code would look like? I tried for HOURS yesterday and just couldn't get it to work. Kept throwing errors. Here's one I tried that outputs a Photoshop general error:

var ref = new ActionReference();

ref.putEnumerated(charIDToTypeID("Lyr "), charIDToTypeID("Ordn"), charIDToTypeID("Trgt"));

var desc = executeActionGet(ref);

var adjs = desc.getList(charIDToTypeID("Adjs"));

var brConDesc = adjs.getObjectValue(0);

var brightness = brConDesc.getInteger(charIDToTypeID("Brgh"));

var contrast = brConDesc.getInteger(charIDToTypeID("Cntr"));

alert("Brightness: " + brightness + "\nContrast: " + contrast);

T

the_king_of_goatsAuthor

Known Participant

Any idea what that code would look like? I tried for HOURS yesterday and just couldn't get it to work. Kept throwing errors.

By @the_king_of_goats

It would be better if you looked at the topics nearby or used the search.

adj.brightness is showing up as undefined when I run this function. Not sure why because the active layer should be a Brightness/Contrast layer.

// Apply auto brightness/contrast adjustment

var autoDescriptor = new ActionDescriptor();

var reference = new ActionReference();

reference.putClass(stringIDToTypeID("adjustmentLayer"));

autoDescriptor.putReference(stringIDToTypeID("null"), reference);

var typeDescriptor = new ActionDescriptor();

var brightnessDescriptor = new ActionDescriptor();

brightnessDescriptor.putBoolean(stringIDToTypeID("auto"), true);

brightnessDescriptor.putBoolean(stringIDToTypeID("useLegacy"), false);

typeDescriptor.putObject(stringIDToTypeID("type"), stringIDToTypeID("brightnessEvent"), brightnessDescriptor);

autoDescriptor.putObject(stringIDToTypeID("using"), stringIDToTypeID("adjustmentLayer"), typeDescriptor);

var resultDesc = executeAction(stringIDToTypeID("make"), autoDescriptor, DialogModes.NO);

var ref = new ActionReference();

ref.putEnumerated(charIDToTypeID('Lyr '), charIDToTypeID('Ordn'), charIDToTypeID('Trgt')); // reference is active layer

var layerDesc = executeActionGet(ref);

var layerID = layerDesc.getInteger(stringIDToTypeID('layerID'));

// Use the function you found to get the brightness descriptor

var brConDesc = get_contrast_desc(layerID);

function get_contrast_desc(id) {

try {

var r = new ActionReference();

var d = new ActionDescriptor();

r.putProperty(stringIDToTypeID("property"), stringIDToTypeID("json"));

r.putEnumerated(stringIDToTypeID("document"), stringIDToTypeID("ordinal"), stringIDToTypeID("targetEnum"));

d.putReference(stringIDToTypeID("null"), r);

d.putInteger(stringIDToTypeID("layerID"), id);

d.putBoolean(stringIDToTypeID("layerInfo"), true);

d.putBoolean(stringIDToTypeID( "includeAncestors" ), false);

eval("var json="+executeAction(stringIDToTypeID("get"), d, DialogModes.NO).getString(stringIDToTypeID("json")));

var d = new ActionDescriptor();

if (!json.layers) return d;

if (json.layers.length != 1) return d;

if (json.layers[0].id != id) return d;

var adj = json.layers[0].adjustment;

alert(adj.brightness); // shows undefined, even though the active layer is a Brightness/Contrast layer

if (!adj) return d;

if (adj.brightness != undefined) d.putInteger(stringIDToTypeID("brightness"), adj.brightness);

if (adj.center != undefined) d.putInteger(stringIDToTypeID("center"), adj.center);

if (adj.useLegacy != undefined) d.putBoolean(stringIDToTypeID("useLegacy"), adj.useLegacy);

return d;

}

catch (e) { throw(e); }

}

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