Adobe Community: Batch change jp2 files to Photoshop (CS3)

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Dec 23, 2006

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1. Noel Carboni,

Jun 29, 2012 6:16 PM in reply to GeoBear

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Have you looked into the freeware viewer IrfanView? I believe if anything can see your files that viewer can. Perhaps you won't have to convert them at all.

http://www.irfanview.com

-Noel

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2. GeoBear,

Jun 29, 2012 6:24 PM in reply to Noel Carboni

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I should have done a better job explaining what I'm trying to do. My ultimate goal is to resize jp2 images and save them for the web with various extensions - .jpg, .png, etc. So I simply need to convert them to Photoshop files so I can open them in Photoshop, modify them, then save them with the proper extensions.

I'll check out IrfanView, though; if it helps with the process, then I'll give it a try.

Thanks.

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3. GeoBear,

Jun 29, 2012 6:26 PM in reply to Noel Carboni

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I just checked out IrfanView, and it looks like it's only for Windows. I'm on a Mac.

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4. R_Kelly,

Jun 29, 2012 6:53 PM in reply to GeoBear

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If the downloads are free maybe you could link so we can get one of the files.

Or post one here using a service like acrobat.com, which is free.

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5. GeoBear,

Jun 29, 2012 7:01 PM in reply to R_Kelly

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I downloaded the books from www.biodiversitylibrary.org. The images are simply in a jp2 format (e.g. MyImage.jp2). I'd never heard of it until I downloaded the books. I'll check out acrobat.com. Thanks.

P.S. I have to go to work now (no Internet connection there), so I won't be able to reply until tomorrow afternoon.

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6. R_Kelly,

Jun 29, 2012 7:08 PM in reply to GeoBear

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I don't think you have to post one here as we can download the images from that site.

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7. station_two,

Jun 29, 2012 7:32 PM in reply to GeoBear

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".jp2" is just the file extension for JPEG 2000, which a number of applications can open, including your Photoshop CS3, Photoshop 13 ("CS6"), Apple Preview, GraphicConverter, Safari, Firefox, etc.. Just install the JPEG2000.plugin from the Optional Plug-Ins folder in your CS3.

Take a look here:

http://www.fileinfo.com/extension/jp2

Mac OS

	Apple Safari	info
	Apple Preview	info
	Adobe Photoshop CS6	info
	Adobe Photoshop Elements 10	info
	Lemkesoft GraphicConverter	info
	Snap Converter	info
	Google Chrome	info
	Mozilla Firefox

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8. GeoBear,

Jun 30, 2012 6:08 PM in reply to station_two

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I clicked Photoshop > About Plug-In and got a dropdown list that includes j2k JPEG 2000. Does that mean this plugin is already installed? Actually, I think that might be the plug-in I installed a few days ago. If so, how do I install the original JP2 plug-in?

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9. Paul Riggott,

Jul 1, 2012 1:59 AM in reply to GeoBear

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Ok, here is one way to convert your jp2 files to jpg

First make sure you can see the documents in Bridge if so continue.

Find ExtendScript Toolkit on your system and open it. This gets installed at the same time as Photoshop.

Make sure you have navigated to the folder where you have the jp2 files in Bridge.

Copy and paste the following code into ExtendScript toolkit and run the code.

#target bridge
app.document.deselectAll();
var thumbs = app.document.getSelection("jp2");
  for(var i = 0;i < thumbs.length;i++){
   if(thumbs[i].spec instanceof File){
    var thumb = thumbs[i];
    var bm = new BitmapData(thumb.spec);    
                  bm = bm.rotate(thumb.spec.rotation); 
                  var Name = decodeURI(thumb.spec.name).replace(/\.[^\.]+$/, '');
                  var exportFilePath = app.document.presentationPath + "/" + Name +".jpg";
    bm.exportTo(new File(exportFilePath),100); 
        }
    }

Bridge will then create a duplicate of the jp2 files but as jpg in the same folder.

Yes Bridge can create files

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10. GeoBear,

Jul 1, 2012 7:59 AM in reply to Paul Riggott

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Wow, that's slick! I was amazed how fast it worked.

A couple questions. First, it changed my files to .jpg, but they're very tiny thumbnails. Do you know how I can change the code so it converts the images to .jpg - but they remain the same size?

Also, can I change the images to other formats, like .png?

Thanks.

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11. Paul Riggott,

Jul 1, 2012 8:57 AM in reply to GeoBear

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They should be the same size as the original files. Sorry but you can only create JPG files in Bridge itself. You can select the files you want then run Tools - Photoshop - Image Processor to change the files to whatever format you require.

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12. GeoBear,

Jul 1, 2012 9:32 AM in reply to Paul Riggott

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No, the new images are just 81 pixels wide. I saw the word "thumb" in your script (five times), so I assumed maybe it was a script for creating thumbnail images?

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13. Paul Riggott,

Jul 1, 2012 9:51 AM in reply to GeoBear

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No they are not thumbnails, they should be the full size of the original image as no resizing is being done. Is there any you could post a link to one of the files so I can do some tests?

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14. R_Kelly,

Jul 1, 2012 10:55 AM in reply to GeoBear

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If you don't have the install cd you can download the extra content for cs3 here:

(be sure to follow the directions on the page)

http://prodesigntools.com/download-adobe-cs4-and-cs3-free-trials-here. html

On windows with that plugin the files from that site open in cs3 and you could use the File>Scripts>Image Processor to convert the files to regular jpegs.

Or make an action using file>save for web or use Paul's Picture Processor:

http://www.scriptsrus.talktalk.net/

This the plugin version from cs3

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15. R_Kelly,

Jul 1, 2012 10:59 AM in reply to Paul Riggott

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Paul,

This is where i got the test files from: (post 5)

http://www.biodiversitylibrary.org/

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16. Paul Riggott,

Jul 1, 2012 12:31 PM in reply to R_Kelly

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Thanks for that. I downloaded the Indian Insect Life (1152 files) I am not seeing a problem here, the converted jpgs are the same size as the originals.

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17. GeoBear,

Jul 1, 2012 1:53 PM in reply to Paul Riggott

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Wow, that's odd. I wonder why mine were all converted to thumbnails?

I found my CS3 installation CD, so I'll see if I can find the plugin I need.

Thanks again for all the tips.

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18. Paul Riggott,

Jul 1, 2012 2:22 PM in reply to GeoBear

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Ah, I have done some more tests onanother machine that has CS3 installed and found that this does not read the correct size of jp2, and does not read the correct size of cache files!

I wonder what size of JPGs you were after?

Here is another version that should work with CS3 but only upto 1024 pixels on the longest side...

#target bridge
app.bringToFront();
function main(){
app.document.deselectAll();
var thumbs = app.document.getSelection("jp2");
  for(var i = 0;i < thumbs.length;i++){
   if(thumbs[i].spec instanceof File){
    var thumb = thumbs[i];
    app.synchronousMode = true; 
                    bm = thumb.core.preview.preview; 
                    app.synchronousMode = false;
    bm = bm.rotate(thumb.rotation); 
                var Name = decodeURI(thumb.spec.name).replace(/\.[^\.]+$/, '');
                    var exportFilePath = app.document.presentationPath + "/" + Name +".jpg";
    bm.exportTo(new File(exportFilePath),100); 
        }
    }
};
main();

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19. GeoBear,

Jul 1, 2012 3:30 PM in reply to Paul Riggott

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Thanks for your help. The jp2 images I want to convert - at least some of them - measure 2587 × 3713 pixels. The most important goal is to convert them to jpg's so I can open them in Photoshop. I finally found a JPG 2000 plugin in my Bridge folder that I pasted into my Photoshop plugins folder, and it works.

It would be nice if I could reduce the file size on some images as well. I'm generally shooting for finished images that are 500 pixels wide. So if a page is 2500 pixels wide, that means reducing it by more than 50%. But some pages have tiny images that don't need to be reduced at all. So I'll probably make multiple copies of each folder and batch process several sizes.

I didn't know working with images could be so much work!

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Batch change jp2 files to Photoshop (CS3)

Jun 29, 2012 6:07 PM

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