"Restoring the original state of a document in Photoshop using JavaScript: A step-by-step

I am looking to create a Photoshop javascript that can resize and save images, while also being able to restore the document back to its original state once the processing is complete.

In Photoshop, I know I can simply go back in the History pane and undo the last actions to revert to the original state. However, how can I achieve this same functionality within a script?
Alternatively, what would be the most effective method for restoring the document to its original state?

It's important to note that the document may not have been saved originally and could still be a work in progress.

javascriptphotoshop

Answer №1

Preserve the current history state:

let currentState = app.activeDocument.currentHistoryState;

Once you have completed your task:

app.activeDocument.currentHistoryState = currentState;

Answer №2

When it comes to making temporary changes, I steer clear of the history state approach since it doesn't always yield satisfactory results for me. My go-to method is duplicating the document and working on that – a strategy that has never let me down.

Answer №3

Undo the changes made to the image using the ScriptListener plugin:

var idUndo = charIDToTypeID( "Undo" );
executeAction( idUndo, undefined, DialogModes.NO );

Answer №4

Here is the solution:

  1. Remember to save the previous history command before starting:
    It can be a bit tricky and may not always work perfectly, as the historyStates list includes some commands that have been "undone" and appear grayed out. Let's assume all the last commands are not grayed.

    history = doc.historyStates.length - 1;

  2. Restore the history state once you're done:

    doc.activeHistoryState = doc.historyStates[history];

  3. Clean up the history by removing any commands generated by your script:

    app.purge(PurgeTarget.HISTORYCACHES);

You can choose to skip step #3, but keep in mind that the commands executed by your script will remain in the history list, appearing grayed out. This could lead to potential issues when running the script again, as you might end up restoring the wrong command. Alternatively, you can purge the grayed out commands from the history before starting with step #1.

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