I do that do the daily in with Photoshop and I have automated the process more or less. I copy what I want to add to my document canvas to the clipboard then I press a function key. The F key plays an Action I recorded it has one step. A script I wrote. The script switches to my self expandable document. If the document is not open the script Creates a new expandable document and paste in the clipboard. Then the script makes the document canvas size the size of the layer that was pasted in and the layer positioned to align with the documents canvas. The bottom layer that was created during for the creation of the expandable document is then deleted. If the Document was open when the script switches to the document it then paste in the clipboard image and expands the document canvas on the bottom the height of the pasted in image layer and if the image pasted in wider then the document canvas, canvas is added to the right side so the document so the width will be as wide as the pasted in image. The script then positions the pasted in layer over the expanded canvas area. So the answer to your question is yes photoshop can do what you want. However Adobe does not provide a automate process to do the processing you want done.
If expansion downward and to the right suits your needs you can use my script. "appendClipboard.jsx"
/* ==========================================================
// 2013 John J. McAssey (JJMack)
// ======================================================= */
// This script is supplied as is. It is provided as freeware.
// The author accepts no liability for any problems arising from its use.
// I set a shortcut key in my case F5 to this Photoshop script mainly for doing Window screen capturing of:
// desktop displays, Active window and selected area copy to clipboard. The script log the cardboard into a document with the name clipboard.
/*
<javascriptresource>
<about>$$$/JavaScripts/AppendClipboard/About=JJMack's Append Clipboard into Clipboard document.^r^rCopyright 2014 Mouseprints.^r^rJJMack's Script.^r
NOTE:New Clipboard Document will be open if necessary</about>
<category>JJMack's Script</category>
</javascriptresource>
*/
// enable double-clicking from Mac Finder or Windows Explorer
#target photoshop // this command only works in Photoshop CS2 and higher
// bring application forward for double-click events
app.bringToFront();
if (!documents.length) {
NewCliboardDoc ();
app.activeDocument.suspendHistory('appendClipboard','main(true)'); // New document opened proceed
}
else { //locate Document clipboard
for (var i=0;i<app.documents.length;i++) {
app.activeDocument=app.documents[i];
if (app.activeDocument.name == "Clipboard"){break;}
}
if (app.activeDocument.name != "Clipboard"){
NewCliboardDoc ();
app.activeDocument.suspendHistory('appendClipboard','main(true)'); // New document opened proceed
}
else {app.activeDocument.suspendHistory('appendClipboard','main(false)'); } // Old Clipboard Document found
}
///////////////////////////////////////////////////////////////////////////////
// main function //
///////////////////////////////////////////////////////////////////////////////
function main(newFile) {
// declare local variables
var orig_ruler_units = app.preferences.rulerUnits;
app.preferences.rulerUnits = Units.PIXELS; // Set the ruler units to PIXELS
try {
activeDocument.paste(); // past in clipboard may fail enclose in try
var LB = app.activeDocument.activeLayer.bounds; // Get the bounds of the work layer
var LWidth = (LB[2].value) - (LB[0].value); // Area width
var LHeight = (LB[3].value) - (LB[1].value); // Area height
// BOTTOMCENTER BOTTOMLEFT BOTTOMRIGHT MIDDLECENTER MIDDLELEFT MIDDLERIGHT TOPCENTER TOPLEFT TOPRIGHT
if(newFile) {
app.activeDocument.resizeCanvas(LWidth, LHeight, AnchorPosition.TOPLEFT);
app.activeDocument.layers[1].remove();
}
else {
if (LWidth>=app.activeDocument.width) { app.activeDocument.resizeCanvas(LWidth, app.activeDocument.height + LHeight, AnchorPosition.TOPLEFT);}
else {app.activeDocument.resizeCanvas(app.activeDocument.width, app.activeDocument.height + LHeight, AnchorPosition.TOPLEFT);}
}
app.activeDocument.selection.selectAll(); // select all
// Left('AdLf'); Right('AdRg'); Top('AdTp'); Bottom('AdBt'); Center Horizontal('AdCH'); Center Vertical('AdCV');
align("AdLf");align("AdBt"); //Align to selection Left bottom
app.activeDocument.selection.deselect();
SetViewFitonScreen();
//app.purge(PurgeTarget.CLIPBOARDCACHE);
}
catch(e) {
if(newFile) app.activeDocument.close(SaveOptions.DONOTSAVECHANGES);
alert("Clipboard Empty");
}
app.preferences.rulerUnits = orig_ruler_units; // Reset units to original settings
}
///////////////////////////////////////////////////////////////////////////////
// main function end //
///////////////////////////////////////////////////////////////////////////////
function NewCliboardDoc () {
// app.documents.add([width][, height][, resolution][, name][, mode][, initialFill][, pixelAspectRatio][, bitsPerChannel][, colorProfileName])
var Clipboard = app.documents.add( null, null, 100, "Clipboard", NewDocumentMode.RGB, null, null, null, "sRGB IEC61966-2.1");
}
function align(method) {
var desc = new ActionDescriptor();
var ref = new ActionReference();
ref.putEnumerated( charIDToTypeID( "Lyr " ), charIDToTypeID( "Ordn" ), charIDToTypeID( "Trgt" ) );
desc.putReference( charIDToTypeID( "null" ), ref );
desc.putEnumerated( charIDToTypeID( "Usng" ), charIDToTypeID( "ADSt" ), charIDToTypeID( method ) );
executeAction( charIDToTypeID( "Algn" ), desc, DialogModes.NO );
};
function SetViewFitonScreen() {
var desc1 = new ActionDescriptor();
var ref1 = new ActionReference();
ref1.putEnumerated(charIDToTypeID('Mn '), charIDToTypeID('MnIt'), charIDToTypeID('FtOn'));
desc1.putReference(charIDToTypeID('null'), ref1);
executeAction(charIDToTypeID('slct'), desc1, DialogModes.NO);
};
JJMack
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