Re: ISO12647-7 question
Re: ISO12647-7 question
- Subject: Re: ISO12647-7 question
- From: Belinda Beckinsale <email@hidden>
- Date: Tue, 05 Feb 2008 08:57:33 +1100
Hi Roger
Yeah, that part is meant to be checking the stability. It deals with the
measurement of the control strip etc, but the area that I'm not fully clear
on is the part that I've mentioned, which states:
The variability of the coloration across the proof print format is limited
by the provision that the colours of nine measurement locations evenly
spaced on the test object (see 5.2.4), which has been printed without prior
modification in view of the printing condition, shall have
⎯ a standard deviation of less than 0,5 each for values of L*, a* and b*;
⎯ a maximum CIELAB colour difference of 2 between the average value and any
one point.
Like I said, I'm not sure if it's nine measurements total, or nine
measurements of each of the colours stated in 5.2.4, and if it's across only
or down as well.
Thanks, Bee
On 31/1/08 1:37 PM, "Roger Breton" <email@hidden> wrote:
> Good question, and I don't know the answer.
>
> That part of the Standard is meant to track the proof colorimetric
> stability, right?
>
>> I have a question regarding section 4.2.2 of 12647-7.
>>
>> Specifically, the part referring to variation of colour across a proof. It
>> states that nine measeurement locations are required evenly spaced across
>> the the test object, and refers to 5.2.4. In 5.2.4, it specifies three
>> different sets of CMYK values that are to be measured.
>>
>> The questions I have are:
>>
>> 1. Are the measurements to be done across the sheet, or down as well, ie is
>> it nine across only, or three by three?
>> 2. are the three sets of CMYK values to have nine measurements each (so you
>> end up with 27 measurements) of is it three measurements for each set of
>> values?
>>
>> I’m guessing that what is required is three separate pages each covered in
>> one of the defined tint values, each of which is then measured nine times in
>> a 3x3 manner, but I just want to check. If anyone knows, I’d appeciate the
>> help.
>>
>> Thanks, Bee
>
> Roger Breton
>
>
Belinda Beckinsale
Sinnott Bros Photography
Unit 30/2 Railway Pde Lidcombe, NSW 2141
Ph: (02) 9646 2711 Fax: (02) 9646-5366
PRIVILEGED - PRIVATE AND CONFIDENTIAL
This e-mail is solely for the use of the addressee and may contain
information which is confidential or privileged. If you receive the e-mail
in error, please delete it from your system immediately and notify the
sender by e-mail or using any of the above contact details.
_______________________________________________
Do not post admin requests to the list. They will be ignored.
Colorsync-users mailing list (email@hidden)
Help/Unsubscribe/Update your Subscription:
This email sent to email@hidden