[time-nuts] OT: Hewlett Packard paint codes

[Jack Hudler]

OOPS... once I loaded the right ICC profile for the scanner and the printer
it all works very nicely now.
Several orders of magnitude better!

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of phil
Sent: Wednesday, December 26, 2007 4:59 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] OT: Hewlett Packard paint codes

> This assumes you have a calibrated scanner and a calibrated printer.
> I don't have an IT8.7 target or its equivalent to calibrate the scanner.
>
> Perhaps I should start there.... heck I'll just try and match it by eye.
>
> Jack

Jack, even if you had the "exact" rgb value of the original color, and if
you intend to duplicate it on an inkjet printer you would have to tweak it
anyway. Printer colors differ by small amounts from brand to brand of ink
and even with same brand in different batches. Within Photoshop you can use
the "replace color" to tweak a given (single) color. Regardless of how you
do it, you have to sample printer output and match (tweak), to even to
calibrate the printer using calibration standards. This gets you very close
unless you have a super cheap scanner and printer and even with cheap
hardware this allows you to accomplish the intended results.
Phil


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