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# Well here's a formula you can start out with :)


// ------------------------------------------------------------------------------------------------
// FUNCTIONS
// ------------------------------------------------------------------------------------------------

// FUNCTION to create a selection
function makeSelection (top_s, left_s, bottom_s, right_s, isElipse) {

var setd = charIDToTypeID( 'setd' );
var actDesc_1 = new ActionDescriptor();
var charID_null = charIDToTypeID( 'null' );
var actRef_1 = new ActionReference();
var charID_chnl = charIDToTypeID( 'Chnl' );
var charID_fsel = charIDToTypeID( 'fsel' );
actRef_1.putProperty( charID_chnl, charID_fsel );
actDesc_1.putReference( charID_null, actRef_1 );


var charID_T = charIDToTypeID( 'T ' );
var actDesc_2 = new ActionDescriptor();
var charID_pxl = charIDToTypeID( '#Pxl' );
var charID_top = charIDToTypeID( 'Top ' );
actDesc_2.putUnitDouble( charID_top, charID_pxl, top_s );
var charID_left = charIDToTypeID( 'Left' );
actDesc_2.putUnitDouble( charID_left, charID_pxl, left_s );
var charID_btom = charIDToTypeID( 'Btom' );
actDesc_2.putUnitDouble( charID_btom, charID_pxl, bottom_s );
var charID_rght = charIDToTypeID( 'Rght' );
actDesc_2.putUnitDouble( charID_rght, charID_pxl, right_s );

if (isElipse == true) {
var charID_elps = charIDToTypeID( 'Elps' );
actDesc_1.putObject( charID_T, charID_elps, actDesc_2 );
var charID_anta = charIDToTypeID( 'AntA' );
actDesc_1.putBoolean( charID_anta, true );

} else {
var charID_rect = charIDToTypeID( 'Rctn' );
actDesc_1.putObject( charID_T, charID_rect, actDesc_2 );
}

executeAction( setd, actDesc_1, DialogModes.NO );

}


// FUNCTION to merge all layers to a single layer
// NOTE : OTHER LAYERS ARE USUALLY DISCARDED BY THIS FUNCTION
function mergeAll () {
while (doc.artLayers.length > 1) {
doc.activeLayer = doc.artLayers[0];
doc.activeLayer.merge();
}
}


// FUNCTION to discard and apply a layer mask to the active layer
function applyLayerMask () {
var charID_dlt = charIDToTypeID( 'Dlt ' );
var actDesc_3 = new ActionDescriptor();
var charID_null = charIDToTypeID( 'null' );
var actRef_2 = new ActionReference();
var charID_chnl = charIDToTypeID( 'Chnl' );
var charID_msk = charIDToTypeID( 'Msk ' );
actRef_2.putEnumerated( charID_chnl, charID_chnl, charID_msk );
actDesc_3.putReference( charID_null, actRef_2 );
var charID_aply = charIDToTypeID( 'Aply' );
actDesc_3.putBoolean( charID_aply, true );
executeAction( charID_dlt, actDesc_3, DialogModes.NO );
}

// FUNCTION to undo changes to the 'original image' layer
function undoImageChange () {
var charID_slct = charIDToTypeID( 'slct' );
var actDesc_4 = new ActionDescriptor();
var charID_null = charIDToTypeID( 'null' );
var actRef_3 = new ActionReference();
var charID_hsts = charIDToTypeID( 'HstS' );
var charID_ordn = charIDToTypeID( 'Ordn' );
var charID_prvs = charIDToTypeID( 'Prvs' );
actRef_3.putEnumerated( charID_hsts, charID_ordn, charID_prvs );
actDesc_4.putReference( charID_null, actRef_3 );
executeAction( charID_slct, actDesc_4, DialogModes.NO );
}

// FUNCTION to generate a random number within a range
function getRandomNumber (min, max) {
randNum = Math.floor(Math.random() * ((max + 1) - min) + min);
return randNum;
}


// ------------------------------------------------------------------------------------------------
// PREPARE THE DOCUMENT
// ------------------------------------------------------------------------------------------------

// store ruler unit preference
var originalRulerUnit = preferences.rulerUnits;

// set temporary script-specific ruler preference
preferences.rulerUnits = Units.PIXELS;

// get a reference to the active document
var doc = app.activeDocument;

// merge all current layers to produce an 'original image' layer
// IDEALLY THIS SHOULD BE DEPENDENT UPON A CONDITIONAL CONFIRMATION DIALOGUE BOX
mergeAll();

// add a new normal art layer
// THIS IS THE 'dot' LAYER THAT THE DOTS WILL BE ADDED TO
var dotLayer = doc.artLayers.add();
dotLayer.kind = LayerKind.NORMAL;


// ------------------------------------------------------------------------------------------------
// CREATE THE DOTS
// ------------------------------------------------------------------------------------------------


// set the elipse top left and bottom right points and the row and column intervals
var elipse_top = 1;
var elipse_left = 1;
var elipse_bottom = 9;
var elipse_right = 9;
var elipse_row_interval = 10;
var elipse_column_interval = 10;

// store total rows and columns required
var total_rows_required = Math.floor(doc.width / elipse_row_interval);
var total_columns_required = Math.floor(doc.height / elipse_column_interval);

// initiate counters for rows and columns
var row_count = 0;
var column_count = 0;

while (column_count < total_columns_required) {


while (row_count < total_rows_required) {

// activate the bottom layer (the 'original image' layer)
doc.activeLayer = doc.artLayers[doc.artLayers.length - 1];

// set the selection parameters
top_s = elipse_top + (column_count * elipse_column_interval);
left_s = elipse_left + (row_count * elipse_row_interval);
bottom_s = elipse_bottom + (column_count * elipse_column_interval);
right_s = elipse_right + (row_count * elipse_row_interval);

// make the selection
// ELIPSE
makeSelection (top_s, left_s, bottom_s, right_s, true);
// RECTANGLE
// makeSelection (top_s, left_s, bottom_s, right_s, false);

// average the selection
doc.activeLayer.applyAverage();

// apply gaussian blur to the selection
// THIS IS ONLY NECESSARY IF THERE ARE TRANSPARENT AREAS ON THE ORIGINAL IMAGE
// if this method is used it's necessary to make multiple copies (approx 10)
// of the finished dot layer and merge them down in order to make the dots opaque
// UNCOMMENT THE NEXT LINE TO APPLY GAUSSIAN BLUR
// doc.activeLayer.applyGaussianBlur(1.7);

// copy the averaged selected area of the 'original image' layer
doc.selection.copy();

// undo the changes to the 'original image' layer
doc.activeLayer = doc.artLayers[1];
undoImageChange();

// paste the copied area INTO THE SELECTION on a new layer
doc.paste(true);

// apply the layer mask
applyLayerMask();

// set the layer's opacity
doc.activeLayer.opacity = 100.0;

// merge the new layer with the 'dot' layer
doc.activeLayer = doc.artLayers[0];
doc.activeLayer.merge();

// increment the row counter
row_count += 1;

}

// reset row_count
row_count = 0;

// increment the column_count
column_count += 1;

}


// ------------------------------------------------------------------------------------------------
// CLEAN UP AND RESET THE DOCUMENT
// ------------------------------------------------------------------------------------------------

// release references
doc = null;
dotLayer = null;
pasteToLayer = null;

// restore original ruler unit setting
app.preferences.rulerUnits = originalRulerUnit;

Edit:
Ashally I don't use this very often any more, I found a way around most of it immediately after writing it, duh.
And it's only a starting point to generate the the 'dots'... it's mainly offset layers and blending modes after that.
(I helped save b3ta! mofaha ┐( ˘_˘)┌ ʅ(́◡◝)ʃ, Mon 5 Feb 2007, 5:48, archived)
# Code!
(I helped save b3ta! Tahkcalb &omega;&infin; for sigs, Mon 5 Feb 2007, 5:58, archived)
# Ugh.
 
What syntax is that?

Java? C? PHP?

I should recognise it but I don't.
(I helped save b3ta! Rapitinui get in the cage and I'll give you a treat, Mon 5 Feb 2007, 6:00, archived)
# It's Javascript.
It turns out you can script photoshop.
I was after a particular effect and wrote this, which work pretty well but very slowly.
Then about an hour after finishing it, I found a really quick way to achieve most of what this can do without any code at all.
I still use it sometimes though, there are a couple of things it can do that are difficult to achieve in other ways.
It's only really a starting point, but it was actually kind of fun to write, just as an exercise in scripting something other than a browser or a flash movie.
(I helped save b3ta! mofaha ┐( ˘_˘)┌ ʅ(́◡◝)ʃ, Mon 5 Feb 2007, 6:03, archived)
# So, that's a neato?
 
If I had photoshop, I'd definitely play around with it.
(I helped save b3ta! Rapitinui get in the cage and I'll give you a treat, Mon 5 Feb 2007, 6:18, archived)
# error on line 49
(I helped save b3ta! mr horrible up yours, dickface, Mon 5 Feb 2007, 6:01, archived)
# Pffft.
(I helped save b3ta! Rapitinui get in the cage and I'll give you a treat, Mon 5 Feb 2007, 6:03, archived)
# s'true
while(doc.artLayers.length 1){
(I helped save b3ta! mr horrible up yours, dickface, Mon 5 Feb 2007, 6:05, archived)
# Looks like it.
edit: on looking at it some it will
still run correctly, as javascript
will bail early (doc.artLayers.length
at zero) before resolving the "1)".
(I helped save b3ta! Tahkcalb &omega;&infin; for sigs, Mon 5 Feb 2007, 6:10, archived)
#
www.b3ta.com/board/6822377
(I helped save b3ta! mofaha ┐( ˘_˘)┌ ʅ(́◡◝)ʃ, Mon 5 Feb 2007, 6:14, archived)
# Hehe! Filters!
Funny that, in the case picked, it
would have worked with some parsers.

Been meaning to play with scripting PS.
thx for the post/code snippet.
(I helped save b3ta! Tahkcalb &omega;&infin; for sigs, Mon 5 Feb 2007, 6:24, archived)
# Check out the scripting listener plugin
and the adobe photoshop scripting forum. Both very helpful.
(I helped save b3ta! mofaha ┐( ˘_˘)┌ ʅ(́◡◝)ʃ, Mon 5 Feb 2007, 6:27, archived)
# Heh
ah, found and fixed
There may be a few other < and > missing
(I helped save b3ta! mofaha ┐( ˘_˘)┌ ʅ(́◡◝)ʃ, Mon 5 Feb 2007, 6:11, archived)
# that figures
(I helped save b3ta! mr horrible up yours, dickface, Mon 5 Feb 2007, 6:16, archived)