Why is OS-X imposing a profile conversion of all greyscale images to "Generic Gray Gamma Profile 2.2"?
Why oh why? This seems to apply to both tagged images (embedded ICC profile) and untagged images. This is making a mess of anyone using a B&W RIP with image space to printer space gamut transformations managed either via tone curves or a kTRC tag within an ICC profile (created by fantastic little utilities such as QTR Create ICC). Of course it also screws up the printing of step wedges for printer response evaluation/profiling (just like the colour world has been thrown a curve ball by the inability to print untagged targets and having to resort to special utilities to do such a basic task).
This sounds like a printer driver issue to me. A true RIP would not be using a printer driver. In reference to PSCS5 no longer having the No Color Management settings, which seemed to have been a knee-jerk response to improperly written printer drivers at the time PSCS5 was being written. There are no profiles applied in the driver when printing B&W to Canon iPF printers so I don't see this as an OS problem. Doyle On Mar 8, 2012, at 9:48 AM, Steve Kale wrote:
Why oh why? This seems to apply to both tagged images (embedded ICC profile) and untagged images. This is making a mess of anyone using a B&W RIP with image space to printer space gamut transformations managed either via tone curves or a kTRC tag within an ICC profile (created by fantastic little utilities such as QTR Create ICC). Of course it also screws up the printing of step wedges for printer response evaluation/profiling (just like the colour world has been thrown a curve ball by the inability to print untagged targets and having to resort to special utilities to do such a basic task). _______________________________________________ Do not post admin requests to the list. They will be ignored. Colorsync-users mailing list (Colorsync-users@lists.apple.com) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/colorsync-users/doyle%40dypinc.com
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On 03/08/2012 05:05 PM, Doyle Yoder wrote:
There are no profiles applied in the driver when printing B&W to Canon iPF printers so I don't see this as an OS problem.
Doyle
Is there no difference in the prints when you print the same B&W image with Gamma 1.8, Gamma 2.2, Dotgain 20, untagged, through that route? Not just ABW but other driver's B&W modes rely on the driver CM that usually expects sRGB or AdobeRGB or Gamma 2.2 assigned images. The HP recommended B&W workflow is "ABW" with driver CM on. -- met vriendelijke groeten, Ernst Shareware too: 330+ paper white spectral plots: http://www.pigment-print.com/spectralplots/spectrumviz_1.htm
On 03/08/2012 05:05 PM, Doyle Yoder wrote:
This sounds like a printer driver issue to me.
A true RIP would not be using a printer driver.
In reference to PSCS5 no longer having the No Color Management settings, which seemed to have been a knee-jerk response to improperly written printer drivers at the time PSCS5 was being written.
There are no profiles applied in the driver when printing B&W to Canon iPF printers so I don't see this as an OS problem.
Doyle
Keith Cooper reviewed both the iPF6100 and iPF8300 and used QTR B&W profiling to get better tone separation in the B&W modes. He did that from a Mac system and used the same trick I proposed some time ago. See: http://www.northlight-images.co.uk/reviews/printer/ipf_6100.html#black_and_w... and more reviews there. -- Met vriendelijke groeten, Ernst Shareware now: Dinkla Gallery Canvas Wrap Actions for Photoshop http://www.pigment-print.com/dinklacanvaswraps/index.htm | Dinkla Grafische Techniek | | www.pigment-print.com | | ( unvollendet ) |
The difference with the Canon is that its got a Photoshop plugin. Its avoiding the OSX print system. The standard OSX print system converts to a standard profile for all throughput. (this is like the display system that all programs can be color managed without actually doing any CM work -- just pass things through to the OS). This all comes out of the Cocoa framework -- its the way it was designed. When Adobe had to update PS, LR etc to Cocoa this started to be noticed. There's a pretty much undocumented feature -- a print settings flag -- that is a special "disable CM flag". It is used for all the Photoshop Manages Color situations. Unfortunately it only seems to work for the RGB line and not for the grayscale pipeline. Roy On Fri, Mar 9, 2012 at 6:06 AM, Ernst Dinkla <E.Dinkla@onsneteindhoven.nl> wrote:
On 03/08/2012 05:05 PM, Doyle Yoder wrote:
This sounds like a printer driver issue to me.
A true RIP would not be using a printer driver.
In reference to PSCS5 no longer having the No Color Management settings, which seemed to have been a knee-jerk response to improperly written printer drivers at the time PSCS5 was being written.
There are no profiles applied in the driver when printing B&W to Canon iPF printers so I don't see this as an OS problem.
Doyle
Keith Cooper reviewed both the iPF6100 and iPF8300 and used QTR B&W profiling to get better tone separation in the B&W modes. He did that from a Mac system and used the same trick I proposed some time ago.
See: http://www.northlight-images.co.uk/reviews/printer/ipf_6100.html#black_and_w... and more reviews there.
-- Met vriendelijke groeten, Ernst
Shareware now: Dinkla Gallery Canvas Wrap Actions for Photoshop
http://www.pigment-print.com/dinklacanvaswraps/index.htm
| Dinkla Grafische Techniek | | www.pigment-print.com | | ( unvollendet ) |
_______________________________________________ Do not post admin requests to the list. They will be ignored. Colorsync-users mailing list (Colorsync-users@lists.apple.com) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/colorsync-users/roy%40harrington.com
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-- Roy Harrington roy@harrington.com www.harrington.com
participants (4)
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Doyle Yoder
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Ernst Dinkla
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Roy Harrington
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Steve Kale