Datacolor User to User Support Group.

David,

I did some more testing today confirming my results. These give identical result:

- No color management from Mac PS CS3
- Spyder3Print Snow Leopard, ColorSync = sRGB
- Spyder3Print Win 7, ICM = off

These don't give the same result as above:
- Spyder3Print Snow Leopard, ColorSync = Generic RGB (close but not same)
- No color management from Mac PS CS4 (too dark)

The reason your instructions worked in the past is that untagged images were assumed to be "Generic RGB" in ColorSync http://developer.apple.com/mac/library/technotes/tn/tn2035.html#TNTAG14, so when selecting "Generic RGB" as destination color space in Print dialog, Colorsync would not do any color transforms, since origin=destination. In Snow Leopard untagged images are treated as sRGB (this change has been mentioned by Eric Chan of Adobe and tested by others, you can Google it), so it follows that you must select sRGB in Print dialog. Two are pretty similar and I can see how your customers would think they have the solution. This is the only conclusion I can draw from results in front of me and reading threads about this issue on Luminous Landscape and elsewhere.

When you find a minute, I would urge you to compare (in Snow Leopard) "Generic RGB", sRGB and a known good target like printed from CS3 or Windows.

Marko

--- In datacolor_group@yahoogroups.com, David Miller <dm2363@...> wrote:
> There's really nothing else to say about this...:-) What I've  
> described for you
> works; I've tested it; verified it as described above (and also built  
> profiles this
> way, and printed through the profiles, and they're fine); and all of  
> the people who
> have used this information in support tickets on the Datacolor site  
> have been happy
> and said that it solved their problem.
> 
> 
> David Miller
> Senior Software Developer, Digital Color Solutions
> Datacolor
>