Script to resize and resample image to longest side

[Oomep_]

Hi friends, 

I have various portrait and landscape images that need to be resized to the longest side (150mm) while also resamping the image to preserve details.

File > Automate > Image Fit... works to constrain proportions but it does not resample the image size to preserve details, so I end up losing resolution.

Creating separate Actions to resize landscape and portrait to 150mm using Image Size is my current solution but I would like to simplify this so I can skip manually selecting portrait or landscape and batch my files faster. 

Is there a script available that will help me batch my files to both resize any image and resample them?

Thanks for reading!

[Stephen_A_Marsh]

Here is something to take a look at, work on a copy of the original for safety. I hacked it from another script, you can ignore the suffix if you wish. The GUI can be removed and the resize value hard-coded into the script for automation. Just use this as a proof of concept for now:

if (app.documents.length !== 0) {

    // ScriptUI version
    // https://forums.adobe.com/message/11151550#11151550

    win = new Window("dialog", "Flatten Dupe, Rename & Resize", undefined, {
        closeButton: false
    });

    win.orientation = "column";
    win.alignChildren = ["center", "top"];
    win.spacing = 10;
    win.margins = 16;


    var statictext1 = win.add("statictext");
    statictext1.text = "Enter filename suffix";
    statictext1.alignment = ["left", "top"];


    var edittext1 = win.add("edittext");
    edittext1.text = ""; //Add text between the quotes for a preset suggestion
    edittext1.preferredSize.width = 300;
    edittext1.preferredSize.height = 25;


    var statictext2 = win.add("statictext");
    statictext2.text = "Enter longest edge in MM";
    statictext2.alignment = ["left", "top"];


    var edittext2 = win.add("edittext");
    edittext2.text = ""; // Add a numerical value for a preset suggestion
    edittext2.preferredSize.width = 300;
    edittext2.preferredSize.height = 25;

    baton10 = win.add("group");

    var button1 = baton10.add("button", undefined, undefined, { name: "Cancel" });
    button1.text = "Cancel";
    button1.preferredSize.width = 90;
    button1.justify = "center";
    button1.alignment = ["left", "top"];


    var button2 = baton10.add("button", undefined, undefined, { name: "Ok" });
    button2.text = "OK";
    button2.preferredSize.width = 90;
    button2.justify = "center";
    button2.alignment = ["right", "top"];

    button2.onClick = function () {
        TEST_A()
        close = true;
        win.close();
    };

    win.show();

    // FUNCTION
    function TEST_A() {

        (function () {
            // Dupe Original File with -Suffix.jsx
            var origDoc = app.activeDocument;
            var baseName = origDoc.name.replace(/\.[^\.]+$/, '');
            var sep = String("-");
            // Add scriptUI input for the suffix variable
            var suffix = edittext1.text
            // https://forums.adobe.com/message/11043796
            if (suffix === null) { return } // Test if CANCEL returns null, then do nothing
            if (suffix === "") { return } // Test if an empty string is returned, then do nothing
            var dupeName = baseName + sep + suffix;
            origDoc.duplicate((dupeName), true);
            app.activeDocument.flatten();
            // Optional Step Below: remove the // comment characters to enable saving the original file with or without changes
            // origDoc.close(SaveOptions.DONOTSAVECHANGES); // (SaveOptions.SAVECHANGES)
        })();

        // https://forums.adobe.com/thread/1031437
        // make document square with the document’s longer side’s length;
        // 2012, use it at your own risk;
        (function () {
            if (app.documents.length > 0) {
                var myDocument = app.activeDocument;
                var originalRulerUnits = preferences.rulerUnits;
                preferences.rulerUnits = Units.MM;
                // Add scriptUI input to the longest edge variable
                var longestEdge = "" + edittext2.text;
                // https://forums.adobe.com/message/11043796
                if (longestEdge === null) { return } // Test if CANCEL returns null, then do nothing
                if (longestEdge === "") { return } // Test if an empty string is returned, then do nothing
                var resizeInput = longestEdge.replace(/[^\d.]/g, '') // Remove anything that is not a digit or decimal point
                if (resizeInput === "") { return } // Test if an empty string is returned, then do nothing
                // https://gomakethings.com/converting-strings-to-numbers-with-vanilla-javascript/
                var resizeValue = parseInt(resizeInput, 10); // Assuming that parseInt is more appropriate than parseFloat
                // get longer side
                var theFactor = resizeValue / getTheLonger(Number(myDocument.width), Number(myDocument.height));
                // resize
                myDocument.resizeImage(myDocument.width * theFactor, myDocument.height * theFactor, myDocument.resolution, ResampleMethod.PRESERVEDETAILS, 0);
                // reset ruler units to original
                preferences.rulerUnits = originalRulerUnits;
            } else { }

            function getTheLonger(a, b) {
                if (a >= b) {
                    var x = a
                } else {
                    var x = b
                }
                return x;
            }
        })();

    }

} else {

    alert('You must have a document open!');

}

Downloading and Installing Adobe Scripts

[Stephen_A_Marsh]

This cut-down version has no GUI and uses 150mm for the longest edge. Again, work on copies until you know that it is 100% working as expected.

#target photoshop
    (function () {
        if (app.documents.length > 0) {
            var myDocument = app.activeDocument;
            var originalRulerUnits = preferences.rulerUnits;
            preferences.rulerUnits = Units.MM;
            var longestEdge = 150; // 150mm
            // get longer side
            var theFactor = longestEdge / getTheLonger(Number(myDocument.width), Number(myDocument.height));
            // resize
            myDocument.resizeImage(myDocument.width * theFactor, myDocument.height * theFactor, myDocument.resolution, ResampleMethod.PRESERVEDETAILS, 0);
            // reset ruler units to original
            preferences.rulerUnits = originalRulerUnits;
        } else { }

        function getTheLonger(a, b) {
            if (a >= b) {
                var x = a
            } else {
                var x = b
            }
            return x;
        }
    })();

[c.pfaffenbichler]

Try »Insert Conditional« from the fly-out menu of the Actions Panel. 

[c.pfaffenbichler]

[Jef Bracke]

Hi Oomep_

the fit image script you get when going to File > Automate > Image Fit... works by applying bicubic resampling.

If you want, you can search on your computer for the Fit Image.jsx file.

On MacOS this is located here: /Applications/Adobe Photoshop CC 2019/Presets/Scripts/Fit Image.jsx

On line 135 you should see the following:

    app.activeDocument.resizeImage(newWidth, newHeight, resolution, ResampleMethod.BICUBIC);

It suffices to change "ResampleMethod.BICUBIC" to "ResampleMethod.PRESERVEDETAILS", saving the file and running the action as you already have it.

Note that this only works on your computer, that is to say: every computer where you wan tthis to work needs to update/change their Fit Image.jsx file.

Alternatively, if you feel like a project, you could also modify the Fit Image script to include a dropdownlist with all the resampling methods... Bit more work though. 🙂

All the best!