make in your favorite program this color setup
rgb working space = eci rgb
CMYK working space = ISO Coated ECI v2
color rendering intent perceptual/photo
assume that you have digital camera/rgb scanner.
1. make icc profile of your digital camera/rgb scanner - important step
2. open file/scan and assign to image icc profile of your camera/scanner
3. convert image to eci rgb, use "convert using icc profiles" ( you can use it relative colorimetric color rendering intent)
4. do all color grading and retouching in rgb color space
if you use photoshop make new preview setup with your output device/media profile
if you prepare job for uncoated paper use iso uncoated, if you prepare for web offset use iso web coated impoved icc profile
all profile you can find on [URL="http://www.eci.org"]http://www.eci.org[/URL]
5. when you finish save job in rgb color space
6. if you work in photoshop don't use " image convert to cmyk"
use "convert using icc profiles"
7. track whats happen in preview window when you choose perceptual or relative colorimetric color rendering intent.
(if you like you can check black point compensation)
as cmyk profile choose your printing process-device profile
there is no rule which intent to choose, perceptual or rel colorimetric. is up to you, what you like. ( most of time i choose perceptual)
after conversion save copy of your job
there is a litlle benefits of 16 bits files. You can't see on the press.
there is a little benefits if you use dithering (especialy in vignete) othervise you got very small noise
tony14 knows what he talking about