Created
December 15, 2011 11:57
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Generating Large Image Grids in Photoshop using Javascript
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var shuffleAndValidateFiles = function(files) { | |
var F = new Array(); | |
while (files.length > 0) { | |
var N = Math.floor(Math.random()*files.length); | |
if ((files[N] instanceof File) && !files[N].hidden) { | |
F.push(files[N]); | |
} | |
files.splice(N,1); | |
} | |
return F; | |
} | |
preferences.rulerUnits = Units.PIXELS; | |
var SEARCH_MASK = "*.jpg"; | |
var PROMPT_TEXT = "Select a folder"; | |
try { | |
var folder = Folder.selectDialog(PROMPT_TEXT); | |
if (folder == null) { | |
throw "noInput"; | |
} | |
var files = folder.getFiles(SEARCH_MASK); | |
files = shuffleAndValidateFiles(files); | |
} catch (exception) { | |
alert(exception); | |
} | |
//Output settings: how many images to output, and the size of each item on the grid in pixels | |
var total = files.length; | |
var gridCols = prompt("How many columns would you like your grid to be?", "4"); | |
var gridRows = Math.max(Math.floor(total / gridCols), 1); | |
var sqWidth = parseInt(prompt("How wide would you like each image to be?", "300"), 10); | |
var sqHeight = parseInt(prompt("How tall would you like each image to be?", "300"), 10); | |
if (confirm( | |
"About to create a "+gridRows+" * "+gridCols+ | |
" grid that is "+(gridRows*sqWidth)+"px * "+(gridCols*sqHeight)+"px large. "+ | |
"There'll be a total of "+total+" images. Is that ok?")) { | |
var doc = app.documents.add(sqWidth*gridCols+"px", sqHeight*gridRows+"px", 300, "Generated Grid"); | |
var cropCurrentToFit = function(newWidth, newHeight) { | |
var docRef = app.activeDocument; | |
var w = parseInt(docRef.width, 10); | |
var h = parseInt(docRef.height, 10); | |
var portrait = h > w; | |
var scale = Math.min(w/newWidth, h/newHeight); | |
var x1, x2, xo, y1, y2, yo; | |
x1 = x2 = w*0.5; | |
xo = scale*newWidth; | |
x1 += xo*0.5; x2 -= xo*0.5; | |
y1 = y2 = h*0.5; | |
yo = scale*newHeight; | |
y1 += yo*0.5; y2 -= yo*0.5; | |
var bounds = [x2, y2, x1, y1]; | |
docRef.crop(bounds, null, newWidth, newHeight); | |
return docRef; | |
} | |
var row = function(y) { | |
for (var x = 0; x < gridCols; x++) { | |
var i = (y*gridCols + x) % files.length; | |
open(files[i]); | |
var currentDoc = cropCurrentToFit(sqWidth, sqHeight); | |
currentDoc.selection.selectAll(); | |
currentDoc.selection.copy(); | |
currentDoc.close(SaveOptions.DONOTSAVECHANGES); | |
app.activeDocument = doc; | |
var xpixel = sqWidth * x; | |
var ypixel = sqHeight * y; | |
doc.selection.select([ | |
[ xpixel, ypixel ], //TOP LEFT | |
[ xpixel + sqWidth, ypixel ], //TOP RIGHT | |
[ xpixel + sqWidth, ypixel + sqHeight ], //BOTTOM RIGHT | |
[ xpixel, ypixel + sqHeight ] //BOTTOM LEFT | |
]); | |
doc.paste(true); | |
doc.selection.deselect(); | |
if (i % 10 == 9) { doc.flatten(); } | |
} | |
} | |
var grid = function() { | |
for (var y = 0; y < gridRows || y < 1; y++) { | |
doc.suspendHistory('Alert', "row("+y+")"); | |
} | |
doc.flatten(); | |
} | |
doc.suspendHistory("Grid Generation", "grid();"); | |
} | |
/* | |
doc.suspendHistory() is used to lower memory usage. | |
Storing every change to the image can get tiresome for all but the best computers, | |
so instead this script "forgets" past actions after completing each row. The whole | |
process is merged into one action at the end of the script. | |
*/ |
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Just wanted to say thanks for sharing this script! Used it to generate a grid 20800px wide with 700 photos, no problem at all 👍