CODEWITHSUNDEEP
opencvimage-processingphotoshoptiff
xiaobaozi
xiaobaozi

Reputation: 1

how to add spot color channel to a tiff image use some code?

I need to add an additional channel (with a custom name, not alpha) to a tiff image. I'm surprised how difficult this is, because the tiff-secification says it is possible to add custom channels and PhotoShop is able to do it. Now I'm looking for a way to automate it....

Does anyone know whether it is now possible with any code or any framework?

like this in photoshop: https://i.sstatic.net/xtOzb.png

Upvotes: 0

Views: 576

Answers (1)

T.MC
T.MC

Reputation: 21

I found some Photoshop JSX code on the web and cobbled it together. I am no coder but it works for me. Run as a script from inside PS. It will select all pixels and make a spot channel white from the selection.

// Define the necessary Photoshop Action IDs
var idSetDescriptor = charIDToTypeID("setd");
var desc = new ActionDescriptor();
var idNull = charIDToTypeID("null");
var refNull = new ActionReference();
var idChannel = charIDToTypeID("Chnl");
var idFront = charIDToTypeID("fsel");
refNull.putProperty(idChannel, idFront);
desc.putReference(idNull, refNull);

var idTarget = charIDToTypeID("T   ");
var refTarget = new ActionReference();
var idChannel = charIDToTypeID("Chnl");
var idChannel = charIDToTypeID("Chnl");
var idTransparency = charIDToTypeID("Trsp");
refTarget.putEnumerated(idChannel, idChannel, idTransparency);
desc.putReference(idTarget, refTarget);

// Execute the action
executeAction(idSetDescriptor, desc, DialogModes.NO);

// Ensure there's an active selection
if (app.activeDocument.selection.bounds) {
    // Create a new spot channel based on the current selection
    var idMk = charIDToTypeID("Mk  ");
    var desc = new ActionDescriptor();
    var idNw = charIDToTypeID("Nw  ");
    var spotChannelDesc = new ActionDescriptor();
    
    // Set the name of the Spot Channel
    var idNm = charIDToTypeID("Nm  ");
    spotChannelDesc.putString(idNm, "white");
    
    // Define the color for the Spot Channel (White in this case)
    var idClr = charIDToTypeID("Clr ");
    var colorDesc = new ActionDescriptor();
    var idH = charIDToTypeID("H   ");
    var idAng = charIDToTypeID("#Ang");
    colorDesc.putUnitDouble(idH, idAng, 0); // Hue (not needed for white)
    var idStrt = charIDToTypeID("Strt");
    colorDesc.putDouble(idStrt, 0); // Saturation
    var idBrgh = charIDToTypeID("Brgh");
    colorDesc.putDouble(idBrgh, 100); // Brightness
    var idHSBC = charIDToTypeID("HSBC");
    spotChannelDesc.putObject(idClr, idHSBC, colorDesc);
    
    // Set opacity to 100%
    var idOpct = charIDToTypeID("Opct");
    spotChannelDesc.putInteger(idOpct, 100);
    
    // Create the Spot Channel
    var idSCch = charIDToTypeID("SCch");
    desc.putObject(idNw, idSCch, spotChannelDesc);
    
    // Execute the action
    executeAction(idMk, desc, DialogModes.NO);

    // Fill the selection with the spot color
    var idFill = charIDToTypeID("Fl  ");
    var fillDesc = new ActionDescriptor();
    var idnull = charIDToTypeID("null");
    var ref = new ActionReference();
    ref.putName(charIDToTypeID("Chnl"), "Spot Channel");
    fillDesc.putReference(idnull, ref);
    var idT = charIDToTypeID("T   ");
    var fillColor = new ActionDescriptor();
    var idClr = charIDToTypeID("Clr ");
    var colorDesc = new ActionDescriptor();
    colorDesc.putDouble(charIDToTypeID("Rd  "), 255); // Red
    colorDesc.putDouble(charIDToTypeID("Grn "), 255); // Green
    colorDesc.putDouble(charIDToTypeID("Bl  "), 255); // Blue
    fillColor.putObject(idClr, charIDToTypeID("RGBC"), colorDesc);
    fillDesc.putObject(idT, charIDToTypeID("Clr "), fillColor);
} else {
    alert("No selection found. Please make a selection first.");
}

Upvotes: 1

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