8 x 8 block
From The Glossary of Digital Photography
A block of 64 pixels, 8 to a side. Images are broken down into 8 x 8 blocks by software for processing into JPEGs. This size was chosen for simplicity of computation.
ONLINE GLOSSARY OF DIGITAL PHOTOGRAPY
A block of 64 pixels, 8 to a side. Images are broken down into 8 x 8 blocks by software for processing into JPEGs. This size was chosen for simplicity of computation.
