Joanna deFelice on fri 21 jan 00
hi all. saw a post yesterday from someone on another list who needs help
creating colors that closely match the colors of the glazes he is using. i
can't help marcelo, but wondered if someone on this list might. The
following is his request. i've added his e-mail address and will let him
know that someone from this list might be able to help him. please also
send him (or me) the address for subscribing to clayart, as i cannot locate
my notes on that (i know i've got them somewhere!)
thanks, joanna
Good afternoon,
We have a problem with spot colors defined on Photoshop.
One solution to us could be o resource like Duotone mode, but in Duotone
we can't use more than one channel. I need to define what color is
produced by mixing by two or more colors. I can do this on Overprint
button
These colors are defined like spot color on channels and on my process
the colors change because of temperature.
If you want to know more about this, read the next part of this message.
We have a problem in our workflow.
We need to show one print to our clients, and they aprrove the ceramic
ware, design and colors. When the clients see the proof, they want as
final product something similar.
We use Adobe Photoshop and a plotter HP 2500 CP to print our proofs. We
create the files with multichannel mode and specify the colors on
channel that will print the same result. We have about 56 glazes
(corants) to use on ceramic. We found the values that we can print the
same result on ceramic and plotter. Vissualy the colors are equals. But,
when we put more than one channel and mix the colors, we can't reproduce
the effect produced by ceramic's process. The only resource that
Photoshop provides is ink's solidity on each channel.
I think that Photoshop simulates colors and combine between them, only
for inks on paper and other materials. The Photoshop don't simulate the
transfomations occured in ceramic, like high temperatures and overprint
glazes.
Is there any solution by software to simulate the ink's combine on
monitor and print? Or other solutions where can we notice the result of
overprint and the Photoshop accepts this values and shows this result on
a monitor and print it on a printer?
We work with PC's with NT.
Thanks for while.
Marcelo Copetti
copetti@pixel.com.br
Mason Batchelder on sat 22 jan 00
http://www.itec.com/CONSUMER/index.htm
this company possibly has the technology to help.
Norman van der Sluys on sun 23 jan 00
I would think your problem would be an extremely difficult one to solve with
software. What you are dealing with is quite different from ovelaying colored
gels, for example. Different combinations of glazes with different applications
and/or different firing schedules will produce results that differ
molecularly. Case in point: In our studio we have used a glaze we call Ohata,
an iron red, in combination with a spodumene creamy white glaze. When the two
overlap the result is a dark brown rather than a lighter orange or tan as you
might expect. So, the color mixtures depend on the chemistry involved. If you
could find a software solution to your problem that worked reliably over a
broad range you would have solved a problem of consistancy (or the lack
thereof) that has confounded and/or delighted potters for literally thousands
of years. But good luck. Perhaps a solution based on sampling accurate
scanned photographs of glazed pieces would be the best way to go. I am not
familiar enough with your software to comment but Paint Shop Pro, a product
of JASC, Inc could do this quite handily. (the program is a great buy, too.)
Norman van der Sluys
http://jackpottery.tripod.com/
Joanna deFelice wrote:
> ----------------------------Original message----------------------------
> hi all. saw a post yesterday from someone on another list who needs help
> creating colors that closely match the colors of the glazes he is using. i
> can't help marcelo, but wondered if someone on this list might. The
> following is his request. i've added his e-mail address and will let him
> know that someone from this list might be able to help him. please also
> send him (or me) the address for subscribing to clayart, as i cannot locate
> my notes on that (i know i've got them somewhere!)
>
> thanks, joanna
>
> Good afternoon,
>
> We have a problem with spot colors defined on Photoshop.
> One solution to us could be o resource like Duotone mode, but in Duotone
> we can't use more than one channel. I need to define what color is
> produced by mixing by two or more colors. I can do this on Overprint
> button
> These colors are defined like spot color on channels and on my process
> the colors change because of temperature.
> If you want to know more about this, read the next part of this message.
>
> We have a problem in our workflow.
>
> We need to show one print to our clients, and they aprrove the ceramic
> ware, design and colors. When the clients see the proof, they want as
> final product something similar.
>
> We use Adobe Photoshop and a plotter HP 2500 CP to print our proofs. We
> create the files with multichannel mode and specify the colors on
> channel that will print the same result. We have about 56 glazes
> (corants) to use on ceramic. We found the values that we can print the
> same result on ceramic and plotter. Vissualy the colors are equals. But,
> when we put more than one channel and mix the colors, we can't reproduce
> the effect produced by ceramic's process. The only resource that
> Photoshop provides is ink's solidity on each channel.
> I think that Photoshop simulates colors and combine between them, only
> for inks on paper and other materials. The Photoshop don't simulate the
> transfomations occured in ceramic, like high temperatures and overprint
> glazes.
>
> Is there any solution by software to simulate the ink's combine on
> monitor and print? Or other solutions where can we notice the result of
> overprint and the Photoshop accepts this values and shows this result on
> a monitor and print it on a printer?
>
> We work with PC's with NT.
>
> Thanks for while.
>
> Marcelo Copetti
> copetti@pixel.com.br
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