Saving large tiff files as jpeg

Hello, experts:
I scanned, as a tiff file, a full-centre spread of a large newpaper. This had to be scanned in eight sections, the pages were so big on my A4 scanner window. When I joined all the sections up in Photoshop CS5, the size of the file was huge (about 21 inches by about 19 inches) It is also digitally large (about 320 MB, since the resolution is 300 dpi). Because I want to keep the composite photo but don't want the file to be so digitally large, yet need the good resolution, I thought it would be a good idea to save it as a jpeg file, which would give me the dimensions I need but not be so digitally bulky as the original. On pressing the drop-down menu for Saving As, the jpeg option did not appear in the dialogue box. Why is this, and how may I save the file in jpeg format? With grateful thanks to any/all that can offer a helpful response,
True to form

Curt, I'm very appreciative of the help you have given so far. However, I did try to change the image to an 8-bit as you recommended, and, though it is possible to make this change, and thereby reduce the sheer amount of data in the photo, when I click to choose 8-bit, the picture goes all bright and weird. This is because when I click on 8-bit, a window also arises, called HDR toning. In this window are lots of sliders, and, try as I may, it does not seem to be possible to adjust anything to make the picture normal in appearance. If you have any useful comment on what to do to make the picture like it is before the change to 8-bit, I should be glad to hear it. Thanks in anticipation.
T.T.F.

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Due to the current unavailability of clairvoyants and mind-readers in the forum, we respectfully request you supply sensible, complete details.
BOILERPLATE TEXT:
Note that this is boilerplate text.
If you give complete and detailed information about your setup and the issue at hand,
such as your platform (Mac or Win),
exact versions of your OS, of Photoshop (not just "CS6", but something like CS6v.13.0.6) and of Bridge,
your settings in Photoshop > Preference > Performance
the type of file you were working on,
machine specs, such as total installed RAM, scratch file HDs, total available HD space, video card specs, including total VRAM installed,
what troubleshooting steps you have taken so far,
what error message(s) you receive,
if having issues opening raw files also the exact camera make and model that generated them,
if you're having printing issues, indicate the exact make and model of your printer, paper size, image dimensions in pixels (so many pixels wide by so many pixels high). if going through a RIP, specify that too.
A screen shot of your settings or of the image could be very helpful too,
etc.,
someone may be able to help you (not necessarily this poster, who is not a Windows user).
Please read this FAQ for advice on how to ask your questions correctly for quicker and better answers:
http://forums.adobe.com/thread/419981?tstart=0
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This might do it...
It will save the individual files in a folder called filechop off the files path.
#target photoshop
function main(){
if(!documents.length) return;
var dlg=
"dialog{text:'Script Interface',bounds:[100,100,380,290],"+
"panel0:Panel{bounds:[10,10,270,180] , text:'' ,properties:{borderStyle:'etched',su1PanelCoordinates:true},"+
"title:StaticText{bounds:[60,10,220,40] , text:'File Chop' ,properties:{scrolling:undefined,multiline:undefined}},"+
"panel1:Panel{bounds:[10,40,250,130] , text:'' ,properties:{borderStyle:'etched',su1PanelCoordinates:true},"+
"statictext1:StaticText{bounds:[10,10,111,30] , text:'Accross' ,properties:{scrolling:undefined,multiline:undefined}},"+
"statictext2:StaticText{bounds:[140,10,230,27] , text:'Down' ,properties:{scrolling:undefined,multiline:undefined}},"+
"across:DropDownList{bounds:[10,30,100,50]},"+
"down:DropDownList{bounds:[140,30,230,50]},"+
"saveFiles:Checkbox{bounds:[10,60,230,80] , text:'Save and Close new files?'}},"+
"button0:Button{bounds:[10,140,110,160] , text:'Ok' },"+
"button1:Button{bounds:[150,140,250,160] , text:'Cancel' }}};"
var win = new Window(dlg,'File Chop');
if(version.substr(0,version.indexOf('.'))>9){
win.panel0.title.graphics.font = ScriptUI.newFont("Georgia","BOLD",20);
g = win.graphics;
var myBrush = g.newBrush(g.BrushType.SOLID_COLOR, [1.00, 1.00, 1.00, 1]);
g.backgroundColor = myBrush;
var myPen =g.newPen (g.PenType.SOLID_COLOR, [1.00, 0.00, 0.00, 1],lineWidth=1);
win.center();
for(var i=1;i<31;i++){
   win.panel0.panel1.across.add ('item', i);
   win.panel0.panel1.down.add ('item', i);
win.panel0.panel1.across.selection=0;
win.panel0.panel1.down.selection=0;
var done = false;
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      var x = win.show();
      if (x == 0 || x == 2) {
        win.canceled = true;
        done = true;
      } else if (x == 1) {
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if(!documents.length)return;
var startRulerUnits = preferences.rulerUnits;
preferences.rulerUnits = Units.PIXELS;
doc = app.activeDocument;
app.displayDialogs = DialogModes.NO;
doc.flatten();
var tilesAcross = parseInt(win.panel0.panel1.across.selection.index)+1;
var tilesDown =parseInt(win.panel0.panel1.down.selection.index)+1;
var tileWidth = parseInt(doc.width/tilesAcross);
var tileHeight = parseInt(doc.height/tilesDown);
var SaveFiles = win.panel0.panel1.saveFiles.value;
ProcessFiles(tilesDown,tilesAcross,tileWidth,tileHeight,SaveFiles);
app.preferences.rulerUnits = startRulerUnits;
main();
function ProcessFiles(Down,Across,offsetX,offsetY,SaveFiles){
try{
var newName = activeDocument.name.match(/(.*)\.[^\.]+$/)[1];
}catch(e){var newName="UntitledChop"}
var Path='';
try{
Path = activeDocument.path;
}catch(e){Path = "~/Desktop";}
if(SaveFiles){
Path = Folder(decodeURI(Path) +"/FileChop");
if(!Path.exists) Path.create();
TLX = 0; TLY = 0; TRX = offsetX; TRY = 0;
BRX = offsetX; BRY = offsetY; BLX = 0; BLY = offsetY;
for(var a = 0; a < Down; a++){
for(var i = 0;i <Across; i++){
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if(SaveFiles){
var saveFile = File(decodeURI(Path+"/"+NewFileName+".jpg"));
SaveJPEG(saveFile, 10);
app.activeDocument.close(SaveOptions.DONOTSAVECHANGES);
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TLX = offsetX * (i+1) ; TRX = TLX + offsetX; BRX = TRX; BLX = TLX;
TLX = 0; TLY = offsetY * (a +1); TRX = offsetX; TRY = offsetY * (a +1);
BRX = offsetX; BRY = TRY + offsetY; BLX = 0; BLY = (offsetY * (a +1)+offsetY);
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jpgSaveOptions.embedColorProfile = true;
jpgSaveOptions.formatOptions = FormatOptions.STANDARDBASELINE;
jpgSaveOptions.matte = MatteType.NONE;
jpgSaveOptions.quality = jpegQuality;
activeDocument.saveAs(saveFile, jpgSaveOptions, true,Extension.LOWERCASE);

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<URL Edited by Host>

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Saving large tiff files as jpeg

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