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It sounds like your PSD do not have a background layer. If you did when you expand the canvas size the background layer expanded canvas would be filled with the background color for it does not support transparency. If you expand a document canvas that does not have a background layer no pixels will be added the expanded canvas area will be transparent. No Layers pixels are changed layer sizes do not change. Your Action would need to use the eye dropper tool to set the background or foreground color swatch. Expand the canvas to the size you want. Add a new empty layer on top and fill that layer with the background color. Move the layer to the bottom of the stack and covert it to a background layer if you want.
For me, it works just fine it always sets color from the top left corner.
Here is the image with action which I have provided above played twice. First time it expanded canvas with color from the image. I have added custom color (black) in the top left corner and played action again. Here is the result.
Here is landscape photo with custom color in the top left corner.
I see no reason to flatten the document to destroy one's work. However, to Automate all I had to add a little scripting the the action. I can not record tool useage Adobey Disables that feature on me,
ConvertBackground.jsx
// A Photoshop Script by JJMack's used by Photo Corners Action
// This script targets the bottom layer and makes sure it a normal layer.
// This script is supplied as is. It is provided as freeware.
// The author accepts no liability for any problems arising from its use.
/*
<javascriptresource>
<about>$$$/JavaScripts/ConvertBackground/About=JJMack's ConvertBackground.^r^rCopyright 2009 Mouseprints.^r^rScript utility for action.^rNOTE:Convert Background to normal layer if there is one!</about>
<category>JJMack's Action Utility</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();
// ensure at least one document open
if (!documents.length) {
alert('There are no documents open.', 'No Document');
}
// if at least one document exists, then proceed
else {
main();
}
///////////////////////////////////////////////////////////////////////////////
// main - main function
///////////////////////////////////////////////////////////////////////////////
function main() {
try {
// declare local variables
var layers = activeDocument.layers;
activeDocument.activeLayer = layers[layers.length-1]; // Target Bottom Layer
activeDocument.activeLayer.isBackgroundLayer=0; // Make it a normal Layer
}
// display error message if something goes wrong
catch(e) { alert(e + ': on line ' + e.line, 'Script Error', true); }
}
SetSamplerColor
var orig_ruler_units = app.preferences.rulerUnits;
app.preferences.rulerUnits = Units.PIXELS; // Set the ruler units to PIXELS
for (var s=0,len=app.activeDocument.colorSamplers.length;s<len;s++) {
var colorSamplerRef = app.activeDocument.colorSamplers
;app.foregroundColor=colorSamplerRef.color;
}
app.preferences.rulerUnits = orig_ruler_units; // Reset units to original settings
Here is how it should be recorded. Your step is recorded without Allow Tool Recording.
Why then does the step show Use Eyedropper followed with " Recording Data:(data)....."
When I use the eyedropper what is recorded is
On my Machine Allow Tool Recording is grayed out not available Adobe's Scriptlistener Plug_In disable Tool Recording
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