Re: Linear Tonal Response output (print) ICC profiles possible?
An interesting discussion that likely relates to an issue I've seen in printing B&W photos. This from a qualitative POV... In using either B&W print modes (ABW or Canon) or icc profiles there is frequently a tendency to crunch deep shadow detail in varying amounts for images on a wide range of papers. Adding a simple hand built 'reverse' tone curve in PS can often even things out, but it would be nice to find a profiling solution that could (if desired) help deliver a more linear looking print from darkest to lightest for a particular paper/inkset. Why bother? I feel it could give a more consistent starting point for editing and printing B&W photos. It's also a question I get asked quite often (indirectly) by photographers trying to print their B&W photography. X-Rite recently added B&W icc options to i1Profiler when they produced the i1Studio version of the software for the ColorMunki. I had hoped that these profiles might show some attention to the non linearity issues I see, but they do not. Bye for now Keith Cooper Northlight Images
On Jan 7, 2018, at 4:23 AM, Keith Cooper <apple@northlight-images.co.uk <mailto:apple@northlight-images.co.uk>> wrote:
I had hoped that these profiles might show some attention to the non linearity issues I see, but they do not.
You can't "fix" that with profiles but you can start with another print driver (and Epson's isn't close to linear). Andrew Rodney http://www.digitaldog.net/ <http://www.digitaldog.net/>
I have in fact built an escp2 driver (from an existing code base) for doing just that using custom 1d luts, but I was hoping to make this workflow all a bit more uniform and standardized. I have not gotten into the lab to test the various suggestions yet, but will tomorrow. All the best, Walker On Sun, Jan 7, 2018 at 10:19 AM Andrew Rodney <andrew@digitaldog.net> wrote:
On Jan 7, 2018, at 4:23 AM, Keith Cooper <apple@northlight-images.co.uk <mailto:apple@northlight-images.co.uk>> wrote:
I had hoped that these profiles might show some attention to the non linearity issues I see, but they do not.
You can't "fix" that with profiles but you can start with another print driver (and Epson's isn't close to linear).
Andrew Rodney http://www.digitaldog.net/ <http://www.digitaldog.net/> _______________________________________________ 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:
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Keith Cooper wrote:
An interesting discussion that likely relates to an issue I've seen in printing B&W photos.
This from a qualitative POV...
In using either B&W print modes (ABW or Canon) or icc profiles there is frequently a tendency to crunch deep shadow detail in varying amounts for images on a wide range of papers.
The normal explanation for this using ICC profiles, is using a colorimetric intent with an idealized source colorspace (i.e. sRGB, AdobeRGB, ProPhoto), since then all input values below the black point of the printer will be clipped. Typical fixes are BPC or a correctly gamut mapped output profile using perceptual intent, or the equivalent device link workflow. Whether this explanation is applicable to your situation is something you will have to explain, since it very much depends on technical details of your workflow. Graeme Gill.
participants (4)
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Andrew Rodney
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Graeme Gill
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Keith Cooper
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Walker Blackwell