Jo ale nativni LAB prostor bych moc moc chtel … ;-)) … mozna vic nez vicebit ;-))
To byste si asi rychle rozmyslel, konvertovat 8bit RGB to LAB a zpět…
Citing Andrew Rodney, from comments on: http://photo.net/learn/digital-photography-workflow/advanced-photoshop-tutorials/sharpening-in-lab-color/
Every time a conversion to LAB is produced, the rounding errors and severe gamut mismatch between the two spaces can account for data loss, known as quantization errors. The amount of data loss depends on the original gamut size and gamma of the working space. For example, if the working space is Adobe RGB, which has 256 values available, converting to 8-bit LAB reduces the data down to 234 values. The net result is a loss of 22 levels. Doing the same conversions from ProPhoto RGB reduces the data to only 225 values, producing a loss of 31 levels. Bruce Lindbloom, a well-respected color geek and scientist, has a very useful Levels Calculator, which allows you to enter values to determine the actual number of levels lost to quantization (see the “Calc page” at http://www.brucelindbloom.com). If you do decide to convert into and out of LAB, do so on a high-bit (16-bit per channel) document.
