[time-nuts] OT: Hewlett Packard paint codes

Patrick optomatic at rogers.com
Wed Dec 26 18:35:26 EST 2007

I am missing the original post, hopefully I am on topic..

I color match quite a bit. I refurbish lab instruments. I have a piece 
of glass over top of my scanner platten. I mix the paint right on the 
scanner and evaluate it with the GIMP. If you have not heard of it, it 
is a free image manipulation program. You can click on a little dropper 
icon inside the program and it will show you the RGB value for the small 
region you clicked on.

Hope this helps, If you need more details please feel free to ask-Patrick

phil wrote:
>> 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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