Photoshop - Some professionals say dot gain 20%, others gamma 2.2 ??????

Hallo, I print only to my inkjet at home, canon 4 ink epson 8 ink. In the colour management policy for photoshop cs3 within creative suite 3 I have set the Grey dot gain to gamma 2.2 instead of the default 20%. There seems to be about a 50/50 on this issue. the botom dot gain (Spot dot gain) this is not important for me.
Could someone clarify this situation because I have found no definitive explanations on the web about this issue. Even colour management tutorils seem always to avoid these issues.
Tankyou, Chris.

Chris,
What you do depends on a number of factors. Dot Gain is usually used when outputting to a press, since it is more likely to reflect press behavior than a gamma curve. If you had the 'average' actual dot gain for a given press, it would probably give you a closer match to a properly calibrated monitor.
If most of your work is either displayed on web, emailed or printed on an inkjet, gamma 2.2 is probably a better overall choice. The web and email are based on sRGB, which also has a gamma of 2.2, so your grascales will display more accurately online if you use gamma 2.2. As long as you use the correct printer profiles for printing (for your paper/ink/printer), your files will be converted so they look correct on your inkjet. The more accurate your profiles, the better the result.
Photoshop will take either your gamma 2.2 or 20% dot gain encoded file and convert the numbers to your printer profile.
Dot gain curves and gamma curves are not quite the same. You can see the effect if you wish as follows: convert a color original to gamma 2.2. Then, ASSIGN a 20% dot gain curve. Your overall image will look lighter than the gamma 2.2 original. Try assigning 25% and 30% dot gain curves, and as the dot gain increases, your file will appear darker. Although not all parts of a dot gain curve mirror a gamma curve precisely, it appears to me that a gamma 2.2 curve is fairly close to a dot gain of approximately 27% or so.
Probably more theory than you wanted. If you aren't going to a press, gamma 2.2 is a good bet and fairly flexible. But you can get good prints both ways.
Lou

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