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Pokud se nebojíte Photoshopu ve Wine, tak tady je můj skriptík v Javascriptu. Zmenšuje to po kouskách a pokaždé trochu doostří. Dá se pustit na jeden obrázek, volat z dávky atp. Dělá to ještě pár "administrativních" věcí navíc. Omluvte kvalitu kódu, je Javascript moc neumím;)

#target photoshop
app.bringToFront();
app.displayDialogs = DialogModes.NO;

var resampleMethod = ResampleMethod­.BICUBIC;
var destMode = ChangeMode.RGB;
var destBitDepth = BitsPerChannel­Type.EIGHT;
var destProfile = "sRGB IEC61966-2.1";

var recipes1 = [["4300px", 20], ["2800px", 30], ["1300px", 20], ["800px", 10]];
var recipes2 = [["3800px", 20], ["2300px", 30], ["1300px", 20], ["800px", 10]];
var recipes3 = [["3300px", 20], ["2300px", 30], ["1300px", 20], ["800px", 10]];
var recipes4 = [["2800px", 20], ["1800px", 30], ["1300px", 20], ["800px", 10]];
var recipes5 = [["2300px", 20], ["1800px", 30], ["1300px", 20], ["800px", 10]];
var recipes6 = [["1800px", 30], ["1300px", 40], ["800px", 10]];
var recipes7 = [["1300px", 50], ["800px", 30]];
var recipes8 = [["800px", 90]];
var recipes9 = [];

function selectRecipes(size) {
var px = size;
px.convert("px");
var value = px.value;

if (value > 4500)
return recipes1;
else if (value > 4000)
return recipes2;
else if (value > 3500)
return recipes3;
else if (value > 3000)
return recipes4;
else if (value > 2500)
return recipes5;
else if (value > 2000)
return recipes6;
else if (value > 1500)
return recipes7;
else if (value > 800)
return recipes8;
else
return recipes9;
}

function resizeWidth(doc, width) {
doc.resizeIma­ge(width, null, null, resampleMethod);
}

function resizeHeight(doc, height) {
doc.resizeIma­ge(null, height, null, resampleMethod);
}

function shrink(doc, recipes, resizer) {
var layer = doc.artLayers[0];

for (i = 0; i < recipes.length; i++) {
var size = recipes[i][0];
resizer(doc, size);
var amount = recipes[i][1];
layer.applyUn­SharpMask(amou­nt, 1, 0);
}
}

function main(doc) {
doc.flatten();
doc.resizeIma­ge(null, null, 300, ResampleMethod­.NONE);
doc.changeMode(des­tMode);
doc.convertPro­file(destProfi­le, Intent.PERCEPTUAL, true, false);
doc.bitsPerChannel = destBitDepth;

if (doc.height <= doc.width) {
shrink(doc, selectRecipes(doc­.width), resizeWidth);
} else {
shrink(doc, selectRecipes(doc­.height), resizeHeight);
}
}

if (app.documents­.length != 0) {
main(app.acti­veDocument);
} else {
alert("No open document!");
}