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Re: TIFF or JPEG??

Posted by Joel Sheffield on Mar 21, 2008; 7:03pm
URL: http://imagej.273.s1.nabble.com/TIFF-or-JPEG-tp3696781p3696786.html

If you are furtunate enough to own or have access to Wilhelm Burger
and Mark Burge's excellent text on Digital Image Processing (Springer
Verlag, 2007), you will find a remarkably clear discussion about the
advantages and problems with the JPEG format starting on page 17.

I am not a programmer, and yet I found the text remarkably lucid,
even to a non-expert.

Joel


Date sent:       Fri, 21 Mar 2008 13:31:19 -0500
Send reply to:   ImageJ Interest Group <[hidden email]>
From:           Kenneth Sloan <[hidden email]>
Subject:         Re: TIFF or JPEG??
To:             [hidden email]

> On Mar 21, 2008, at 12:36 PM, Gabriel Landini wrote:
> > On Friday 21 March 2008, RES08 wrote:
> >> Hello, im extremely new to using imagej and i was just wondering  
> >> if it is
> >> better to use images saved as TIFFs or JPEG? At the minute the  
> >> images im
> >> using are saved as JPEGs on the camera and computer, however  
> >> before using
> >> them in imageJ i save them as TIFFs!
> >
> > Point 4 in here tells you why one should not use jpegs in image  
> > analysis:
> > http://imagejdocu.tudor.lu/imagej-documentation-wiki/faq/what- 
> > should-i-do-before-start-using-imagej-in-my-project
> >
> > If you already have jpegs, your images are already lossy and the  
> > only solution
> > is to grab images again.
> >
> > Cheers
> >
> > Gabriel
>
> This is conventional wisdom among those of us who endured low  
> resolution, low quality images of the past.  Without knowing more  
> about the application, the imaging setup, and the objects being  
> imaged, it's impossible to say.
>
> As a general rule, if you are treating your images as collections of  
> pixels which happen to be packed together in a fairly arbitrary way,  
> then tiff will be better than jpeg.  If, on the other hand, you are  
> analyzing large scale structures, then jpeg *may* be appropriate.
>
> --
> Kenneth Sloan                                          
> [hidden email]
> Computer and Information Sciences                        +1-205-934-2213
> University of Alabama at Birmingham              FAX +1-205-934-5473
> Birmingham, AL 35294-1170                http://KennethRSloan.com/


--
Joel B. Sheffield, Ph.D.
Biology Department, Temple University
1900 North 12th Street
Philadelphia, PA 19122
[hidden email]  
(215) 204 8839, fax (215) 204 0486
http://astro.temple.edu/~jbs