Peppers (512x512 color)
 
The following images are Peppers compressed 100:1 by each codec.
 
DLI, 7803 Bytes
 
Kakadu JPEG2000, 7839 Bytes
 
Jasper JPEG2000, 7860 Bytes
 
HD Photo (WMP), 7969 Bytes
 
IJG JPEG, 8255 Bytes
 
The following are magnified sections for each of the above images.
 
DLI, 7803 Bytes
 
Kakadu JPEG2000, 7839 Bytes
 
Jasper JPEG2000, 7860 Bytes
 
HD Photo (WMP), 7969 Bytes
 
IJG JPEG, 8255 Bytes
 
Visualization of Y-PSNR for the above images, order of colors for increasing error (black, blue, green, yellow, red).
 
DLI, 7803 Bytes
 
Kakadu JPEG2000, 7839 Bytes
 
Jasper JPEG2000, 7860 Bytes
 
HD Photo (WMP), 7969 Bytes
 
IJG JPEG, 8255 Bytes
 
The following images are compressed by each codec to approximately the same PSNR.
In my opinion they are not all equal in subjective quality, however I leave it to the reader to make his/her own determinations.
 
DLI, 4877 Bytes (161:1), 31.39 Y-PSNR
 
Kakadu JPEG2000, 7757 Bytes (101:1), 31.42 Y-PSNR
 
Jasper JPEG2000, 9469 Bytes (83:1), 31.43 Y-PSNR
 
HD Photo (WMP), 9514 Bytes (83:1), 31.39 Y-PSNR
 
IJG JPEG, 10458 Bytes (75:1), 31.33 Y-PSNR
 
The following are magnified sections for each of the above images.
 
DLI, 4877 Bytes (161:1), 31.39 Y-PSNR
 
Kakadu JPEG2000, 7757 Bytes (101:1), 31.42 Y-PSNR
 
Jasper JPEG2000, 9469 Bytes (83:1), 31.43 Y-PSNR
 
HD Photo (WMP), 9514 Bytes (83:1), 31.39 Y-PSNR
 
IJG JPEG, 10458 Bytes (75:1), 31.33 Y-PSNR