identifikasi

KOMPRESI CITRA DENGAN TEKNIK LOOLESS DAN LOSSY

Siswo Wardoyo

Teknik Elektro Fakultas Teknik Universitas Tidar Magelang

Jln. Kapten Suparman No. 39 Magelang

doyok1978@yahoo.com

ABSTRACT

Making image files smaller is a win for transmitting files across networks and for archiving libraries of images. The best known lossless compression methods can compress such data about 2:1 on average.  

JPEG can typically achieve 10:1 to 20:1 compression without visible loss, bringing the effective storage requirement down to 1 to 2 bits/pixel.  30:1 to 50:1 compression is possible with small to moderate defects, while for very-low-quality purposes such as previews or archive indexes, 100:1 compression is quite feasible.  

An image compressed 100:1 with JPEG takes up the same space as a full-color one-tenth-scale thumbnail image, yet it retains much more detail than such a thumbnail.

Kata kunci : lossless, compression, JPEG