I understand the color issues and purposes for using LAB, and this is not intended for this question. Yes, Christian *resample* must be checked for downsizing to occur, but thanks for the good links.
The reason for converting to LAB and downsizing in 50% increments with USM applied at each level is to achieve far superior JPEGS for web use, while maintaining a "one size fits all" work flow. JPEGS down sampled in this way accurately represent a high resolution scan or digital file without artifacts or loss of tonal range. The best description of the technique I know of is by David Riecks at : http://www.controlledvocabulary.com/imagedatabases/downsampling.html
Pedro Luz Cunha are you Brazilian ?
Steven Poe Photographer, Instructor, Digital Artist > www.stevenpoe.com Product Development > www.imagetechdigital.com Business Development > www.espressophoto.com
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