Re: Reducing File Size with Photoshop

[Steve Jolly]

Yes, with the important difference that the jpeg packing process 
degrades the image quality each time you save it.  The advantage of this 
is that it makes the file sizes much smaller than a "lossless" 
compression format such as compressed TIF.

S
Jens Bladt wrote:
So, a Jpeg is like a zip file, packing itself when saved, unpacking when
opended?
Jens Bladt
mailto:[EMAIL PROTECTED]
http://hjem.get2net.dk/bladt
-----Oprindelig meddelelse-----
Fra: Don Sanderson [mailto:[EMAIL PROTECTED]
Sendt: 13. november 2004 11:40
Til: [EMAIL PROTECTED]
Emne: RE: Reducing File Size with Photoshop
Are you referring to a .JPG file?
If so it has to be uncompressed for display/editing.
It is then recompressed when saved as a file again.
A .tif is the same if compression is used.
Don

-----Original Message-----
From: Jens Bladt [mailto:[EMAIL PROTECTED]
Sent: Saturday, November 13, 2004 4:33 AM
To: [EMAIL PROTECTED]
Subject: RE: Reducing File Size with Photoshop
Can anyone explain:
Why is the file size of an *ist D image say 3.936 MB in the Path
Finder, and
17,3 MB when opened in PS?

Jens Bladt
mailto:[EMAIL PROTECTED]
http://hjem.get2net.dk/bladt
-----Oprindelig meddelelse-----
Fra: Shel Belinkoff [mailto:[EMAIL PROTECTED]
Sendt: 13. november 2004 10:06
Til: [EMAIL PROTECTED]
Emne: RE: Reducing File Size with Photoshop
What's this "New Image data?" I couldn't find it in any of the menus or in
the help area.
Shel

[Original Message]
From: Jens Bladt <[EMAIL PROTECTED]>

That's right Shel. Provided you have chosen "New Image Data" in
PS, which
makes the computer calculate new pixels to put in between the original
pixels