Restoring bitmap (image) dimensions and PPI

Question

Here's something I haven't found a quick solution to after several years of use.
The scenario is the following:
1. You receive a document that has the images embedded and no access to original links.
2. The images are scaled and proportions have changed. For example, PPI: 85.372 x 71.954 and Image Scale (H, V): 84.337%, 100.065%.
Is there a quick way to change image scale to 100%, 100% or PPI to 72 x 72??
I always have to do this by calculating the percentage the image has to be restored by horizontally and vertically to get the original ratio.
Cheers.

Answer 1

Mario Arizmendi wrote:
Ok, Suppsosing you are on a Mac, see bellow the code, copy and paste exactly as it is in whatever TexEditor, and save it naming it UnScale.js (remove manually whatever other extension like .txt or .rtf..ect).
Then place that file into your script directory and access it form the Illustrator CS3 application File/Scripts/OtherScripts... you must selec first the photo before aplly the script.
so here is the code
//    UnScale.js
//    http://www.pictrix.jp/   Umezawa
if ( documents.length > 0 ){
    SelObj = activeDocument.selection;
    for ( i = 0; i < SelObj.length; i++ ){
        gp( SelObj[ i ] );
function gp( xObj )
    if( xObj.typename == "GroupItem" ){
        var gnObj = xObj.groupItems;
        if ( gnObj.length > 0 ){
            for ( var g = 0; g < gnObj.length; g++ ) gp( gnObj[ g ] );
        gObj = xObj.placedItems;
        for ( j = 0; j < gObj.length; j++ ){
            type = check( gObj[ j ] );
            if ( type != 0 ) reset( gObj[ j ], type );           
        gObj = xObj.rasterItems;
        for ( j = 0; j < gObj.length; j++ ){
            type = check( gObj[ j ] );
            if ( type != 0 ) reset( gObj[ j ], type );           
    else{
        type = check( xObj );
        if ( type != 0 ) reset( xObj, type );
function check( pi )
    type = 0;
    if ( pi.typename == "PlacedItem" ){
        if ( pi.file.name.indexOf('.eps') != -1 ) {
            type = 1;
        else type = 2;
    if ( pi.typename == "RasterItem" ) type = 3;
    return ( type );
function reset( pi,  type )
    pos = pi.position;
    mx = pi.matrix;
    mx.mValueA =  ( type == 2 )? -1.0 : 1.0;
    mx.mValueB = 0.0;
    mx.mValueC = 0.0;
    mx.mValueD = 1.0;
    pi.matrix = mx;
    pi.left    = pos[ 0 ];
    pi.top    = pos[ 1 ];
    if ( type == 2 ) pi.rotate( 180.0 );
Thanks!