Re: It's The White Stupid
Re: It's The White Stupid
- Subject: Re: It's The White Stupid
- From: Louis Servedio-Morales <email@hidden>
- Date: Thu, 04 Oct 2012 18:35:31 -0400
Thanks Terry that helps and I think I'm getting it. But a few questions still loom.
Questions:
1. So am I entering a new white value sampled from the final destination actual printing substrate (i.e. McCoy Silk) or the white of the proofing paper? I'm thinking it's the former.
2. I used the newer i1Pro2 and the i1profiler OBC workflow to make my inkjet profile. Measurement mode was: Dual scan (M0, M1, M2 and OBC). And yes, I did end up entering UV correction values to correct for OBAs. But since my final profile has a white point of L97 a2 b-7 I'm guess it used a non-UV measurement for this value. Do you agree and should I use a non-UV measurement for the "New Paper WHite Value" of the McCoy substrate?
3. I am understanding that after creating a new CGATS file with the new "substrate modified data" I can then use it in i1Profiler and create a "relative" GraCol profile that I then simulate printing with. Is this correct?
4. Is i1Profile good with seven decimal point values? The sample CGATS file had two decimal point values and the calculator is spitting out seven places. I'm really not savvy enough in ExCel to round values off but I'm sure I can figure it out if need be.
thanks again Terry and Mike,
-Louis
On Oct 4, 2012, at 3:00 PM, Terence Wyse wrote:
>
> Date: Thu, 04 Oct 2012 14:08:28 -0400
> From: Terence Wyse <email@hidden>
> To: ColorSync User List List <email@hidden>
> Subject: Re: It's The White Stupid
> Message-ID: <email@hidden>
> Content-Type: text/plain; charset=windows-1252
>
> Louis, the calculator Mike pointed you to is for creating a new GRACoL dataset with the white point adjusted for a different substrate. In a way, it has nothing to do with your inkjet printer, it's all about creating a different GRACoL profile to use for soft-proofing and as a source profile for an inkjet or other proof. If you already have an output profile for your inkjet printer, you would simply use the new GRACoL profile as source and convert/print using absolute colorimetric rendering so the new substrate is imposed on your inkjet printer/paper.
>
> One caveat....make sure you use the same spectro filtration when you sample the stock you want to simulate that you used when creating your inkjet printer's output profile. If you have a filtration mismatch when dealing with OBA papers, the simulation will not come out correct...if you use the same filter for both, it should be reasonably close.
>
> Terry
> ______________________________________
> Terence Wyse, WyseConsul
> Color Management Consulting
> G7 Certified Expert
> FIRST Level II Implementation Specialist
>
>
>
> On Oct 4, 2012, at 1:11 PM, Louis Servedio-Morales <email@hidden> wrote:
>
>> Thanks Mike. The problem I see with this calculator is that I have no way of printing on the final "substrate" with my inkjet printer to read patches from. The best I can do is find some inkjet paper (coated for inkjet inks), and I do have a few, who's white is similar in paper white brightness and possible OBAs as the final substrate to be used. I can build a good RGB profile to print on this paper straight up with the help of i1Profiler and OBC profiling. But can I use this in any way to simulate press conditions with the non GraCol paper via any icc sophistry?
>>
>> -Louis
>>
>> On Oct 3, 2012, at 7:05 PM, Michael Eddington <email@hidden> wrote:
>>
>>> Gracol has a substrate whiteness calculator to compensate for
>>> differences in paper whiteness, which has some degree of success with
>>> papers with OBAs. It's available on the Idealliance website. You may
>>> find it useful.
>>>
>>> Mike Eddington
>>>
>>> Sent from my iPhone
>>>
>>> On Oct 3, 2012, at 5:22 PM, Louis Servedio-Morales
>>> <email@hidden> wrote:
>>>
>>>> “It’s the white stupid” has been my most recent mantra. I’m a retoucher with a new client who’s printing ranges from “natural” white papers to papers containing high amounts of OBA’s. So, in attempts to please this client I have decided to fall into the OBA rabbit hole without any detail understanding as to how printers use the icc standards workflow ( i.e. GraCol) when printing to these papers. As I understand it and putting it simply, the GraCol control strip can only pass certification when printed properly on paper containing no OBAs and only a specified amount of brightness (i.e. L=95). So this leads me to two main issues. One is how to proof my work for this client and simulate how it would look on a bright white paper stock (e.g. McCoy Silk)? Well aware that the white of the paper (blueness) influences the overall color well into the midtones. And two, can a printer make use of the "non-standard" proof and file that created it? Any help on this matter is appreciated.
>>>>
>>>> Thank you,
>>>> Louis Servedio-Morales
>>>>
>>>>
>>>>
>>>>
>>>>
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