GIS Raster formats: comparative benchmark

Sample: color-ortho [EPSILON - wavelet]

This page explores the RGB color-space and related compression algorithms:

• 3 components per pixel: Red, Green and Blue
• 8 bits per sample: this means 256 levels for each color component [0 - 255]
• so each pixel requires 3x8 = 24 bits
• a total of 16.7 millions different colors can thus be encoded
• this is the TrueColor color model universally adopted by the digital photographic industry

Sample	Notes
the EPSILON [wavelet] algorithm supports lossy compression. EPSILON allows to select a variable compression ratio factor: 1:1 - best quality, heavy size 1:200 - worst quality, light size
	very good quality quite identical to the original image 10% of the original size
EPSILON [wavelet] Ratio: 1:10
	good quality 7% of the original size
EPSILON [wavelet] Ratio: 1:15
	acceptable quality 4% of the original size
EPSILON [wavelet] Ratio: 1:25
	poor quality 2% of the original size the image is noticeably blurred
EPSILON [wavelet] Ratio: 1:50
	very poor quality 1% of the original size the image is severely blurred
EPSILON [wavelet] Ratio: 1:100

Last updated: 2010-07-27 Author: Alessandro Furieri

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