OK, the code from @jazz-y is a little hard for me to decipher! :]
I hacked at it for saving as PNG, but it may take a bit more work to get Save for Web in there!
/*
https://community.adobe.com/t5/photoshop-ecosystem-discussions/problem-resizing-during-export/td-p/13654079
https://community.adobe.com/t5/photoshop-ecosystem-discussions/divide-my-image-to-layers/m-p/12467520
https://community.adobe.com/t5/photoshop-ecosystem-discussions/script-for-splitting-multiple-psds-to-defined-slices/m-p/12592481#M608089
*/
#target photoshop
var s2t = stringIDToTypeID,
AR = ActionReference,
AD = ActionDescriptor;
try {
try {
(r = new AR).putProperty(s2t('property'), p = s2t('layerID'));
r.putEnumerated(s2t('layer'), s2t('ordinal'), s2t('targetEnum'));
var id = executeActionGet(r).getInteger(p);
}
catch (e) { throw "No layer selected!\nOpen the document and select layer" }
try {
(r = new AR).putProperty(s2t('property'), p = s2t('slices'));
r.putEnumerated(s2t('document'), s2t('ordinal'), s2t('targetEnum'));
var slices = executeActionGet(r).getObjectValue(p).getList(p);
}
catch (e) { throw "This version of photoshop does not have access to slices" }
(r = new AR).putProperty(s2t('property'), p = s2t('resolution'));
r.putEnumerated(s2t('document'), s2t('ordinal'), s2t('targetEnum'));
var res = executeActionGet(r).getDouble(p);
(r = new AR).putProperty(s2t('property'), p = s2t('title'));
r.putEnumerated(s2t('document'), s2t('ordinal'), s2t('targetEnum'));
var nm = executeActionGet(r).getString(p).replace(/\..+$/, '');
try {
(r = new AR).putProperty(s2t('property'), p = s2t('fileReference'));
r.putEnumerated(s2t('document'), s2t('ordinal'), s2t('targetEnum'));
var pth = executeActionGet(r).getPath(p);
}
catch (e) { throw "File not saved!" }
for (var i = 0; i < slices.count - 1; i++) {
(r = new AR).putIdentifier(s2t('layer'), id);
(d = new AD).putReference(s2t('target'), r);
executeAction(s2t('select'), d, DialogModes.NO);
(r = new AR).putProperty(s2t('channel'), s2t('selection'));
(d = new AD).putReference(s2t('target'), r);
d.putObject(s2t('to'), s2t('rectangle'),
function (b, d) {
for (var i = 0; i < b.count; i++)
d.putUnitDouble(k = (b.getKey(i)), s2t('pixelsUnit'), b.getInteger(k))
return d;
}(slices.getObjectValue(i).getObjectValue(s2t('bounds')), new AD)
);
executeAction(s2t('set'), d, DialogModes.NO);
try {
(d = new AD).putString(s2t("copyHint"), "pixels");
executeAction(s2t("copyEvent"), d, DialogModes.NO);
(d = new AD).putClass(s2t("mode"), s2t("RGBColorMode"));
d.putUnitDouble(s2t("width"), s2t("distanceUnit"), 1 * 72 / res);
d.putUnitDouble(s2t("height"), s2t("distanceUnit"), 1 * 72 / res);
d.putUnitDouble(s2t("resolution"), s2t("densityUnit"), res);
d.putEnumerated(s2t("fill"), s2t("fill"), s2t("white"));
d.putInteger(s2t("depth"), 8);
d.putString(s2t("profile"), "sRGB IEC61966-2.1");
(d1 = new AD).putObject(s2t("new"), s2t("document"), d);
executeAction(s2t("make"), d1, DialogModes.NO);
(d = new AD).putEnumerated(s2t("antiAlias"), s2t("antiAliasType"), s2t("antiAliasNone"));
d.putClass(s2t("as"), s2t("pixel"));
executeAction(s2t("paste"), d, DialogModes.NO);
executeAction(s2t("revealAll"), new AD, DialogModes.NO);
executeAction(s2t("flattenImage"), undefined, DialogModes.NO);
if (activeDocument.mode !== DocumentMode.RGB) {
activeDocument.convertProfile("sRGB IEC61966-2.1", Intent.RELATIVECOLORIMETRIC, true, false);
}
activeDocument.convertProfile("sRGB IEC61966-2.1", Intent.RELATIVECOLORIMETRIC, true, false);
(d = new AD).putObject(s2t("as"), s2t("PNGFormat"), new AD);
d.putPath(s2t("in"), File(pth.path + '/' + nm + ' ' + ('0' + i).slice(-2) + '.png'));
d.putEnumerated(s2t("saveStage"), s2t("saveStageType"), s2t("saveBegin"));
executeAction(s2t("save"), d, DialogModes.NO);
executeAction(s2t("close"), new AD, DialogModes.NO);
(r = new AR).putProperty(s2t('channel'), s2t('selection'));
(d = new AD).putReference(s2t('null'), r);
d.putEnumerated(s2t('to'), s2t('ordinal'), s2t('none'));
executeAction(s2t('set'), d, DialogModes.NO);
}
catch (e) { throw e + "\nScript cannot create layer from empty space!\nMake sure that current layer contains pixels in all slices." }
}
} catch (e) { alert(e) }
https://prepression.blogspot.com/2017/11/downloading-and-installing-adobe-scripts.html
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