- JPEG encoder has three main blocks namely, Forward Discrete Cosine Transform, Quantizer and Entropy Encoder.

- JPEG encoder is the main component for lossless and hierarchical encoders.

- It is suitable for gray scale and color images.

- Each image is divided into 8 x 8 blocks.

- A group of 4 tables are specified by JPEG.

- If the table has quality value with 1, then the quality is best and compression is lowest.

- If the table has quality value with 2, then the quality is best and compression is highest.