Digital BW, The Print

On 03/07/2012 10:21 AM, Steve Kale wrote:
> It would be good if the community berated Apple on this stuff
>
> http://www.apple.com/feedback/macosx.html
>
> On 2 Mar 2012, at 10:55, Steve Kale wrote:
>
>  >
>  > There do appear to be issues with QTR, ABW and OS-X (at least with
> 10.6.8) but they appear to be surmountable. I exchanged messages with
> Roy on this and he was, as ever, extremely helpful (and patient as I
> refreshed my memory on some of this stuff that I've been away from for
> awhile). He commented that, at least with QTR, OS-X always converts a
> greyscale image to Generic Gray Gamma 2.2. I decided to run a few tests
> with ABW. At least if PS is set to Printer Manages Colors (as this is
> what I was testing) OS-X 10.6.8 converts a greyscale file (whether
> tagged or not) to Generic Gray Gamma 2.2 Profile before it gets to Epson
> ABW as well. I printed an untagged step wedge, a step wedge converted to
> Generic Gray Gamma 2.2 Profile, a step wedge converted to Gray Gamma 1.8
> and a step wedge assigned with Generic Gray Gamma 2.2. The first 3
> produced an almost identical L* ramp from the printer (similar enough
> for the variance to just be paper, ink drying etc). The last step wedge
> had a much different profile (and a more linear L* ramp suggesting no
> colour management adjustments).


Could it be worse, OS-X Colorsync assigning an untagged target image 
with the current monitor profile?  It has that policy in Safari if I 
recall it correctly, where any sane application/browser uses sRGB as the 
colorspace to assign if an image has no tag. If so the results could 
differ between users. Many will have Gamma 2.2 as the base for monitor 
calibration-profiling. Others will have another setting or still the 
default monitor profile.


-- 
met vriendelijke groeten, Ernst
Shareware too:
330+ paper white spectral plots:
http://www.pigment-print.com/spectralplots/spectrumviz_1.htm