Hi everyone, I'm working on profiling two different Epson printers, a 7800 and a 7890. Even though both printers are using the same, exact substrate, is it to be expected that there would be some "slight (but visible) differences" between the two printers? (I know I can't show you the prints.) I convert from GRACol2006 to the 7800 and from GRACoL2006 to the 7890, using absolute colorimetry in both cases. Same conversion, same substrate, the only difference is the two printers. In your opinion, what could account for the slight differences I observe? Is it possible (that's my best take) that the difference in the generation of inks used on both of these printers could account for the slight differences I observe? Best / Roger Breton www.graxx.ca
Hi Roger, there are some reasons that come to my mind: 1) The profiles do not represent the actual printer status anymore (or never did) - printer(s) changed after having done the measurements - measurement errors - inaccurate sampling of the individual printers’ non-linearities during characterization 2) Nozzle issues (which is basically another reason for 1) :-) 3) Out of gamut colours (unlikely with the combination you mention) Did you do a simulation of the result without printing? Is the dE-distribution similar for both printers? Just an idea to start digging into it. Best regards Claas
Am 26.09.2019 um 15:57 schrieb Roger Breton via colorsync-users <colorsync-users@lists.apple.com>:
Hi everyone,
I'm working on profiling two different Epson printers, a 7800 and a 7890.
Even though both printers are using the same, exact substrate, is it to be expected that there would be some "slight (but visible) differences" between the two printers? (I know I can't show you the prints.)
I convert from GRACol2006 to the 7800 and from GRACoL2006 to the 7890, using absolute colorimetry in both cases. Same conversion, same substrate, the only difference is the two printers.
In your opinion, what could account for the slight differences I observe? Is it possible (that's my best take) that the difference in the generation of inks used on both of these printers could account for the slight differences I observe?
Best / Roger Breton
www.graxx.ca
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Hi Roger, Assuming that the colors that you are trying to simulate are well within the gamut of both printers, the difference is probably being caused by the way their respective media profiles are made. The media has to be profiled separately with comparable settings on each printer. A proper profiling of the media on both printers usually takes care of differences between their respective ink sets. Best, Refik On 26.09.2019 16:58, "colorsync-users on behalf of Roger Breton via colorsync-users" <colorsync-users-bounces+rtelhan=icloud.com@lists.apple.com on behalf of colorsync-users@lists.apple.com> wrote: Hi everyone, I'm working on profiling two different Epson printers, a 7800 and a 7890. Even though both printers are using the same, exact substrate, is it to be expected that there would be some "slight (but visible) differences" between the two printers? (I know I can't show you the prints.) I convert from GRACol2006 to the 7800 and from GRACoL2006 to the 7890, using absolute colorimetry in both cases. Same conversion, same substrate, the only difference is the two printers. In your opinion, what could account for the slight differences I observe? Is it possible (that's my best take) that the difference in the generation of inks used on both of these printers could account for the slight differences I observe? Best / Roger Breton www.graxx.ca _______________________________________________ Do not post admin requests to the list. They will be ignored. colorsync-users mailing list (colorsync-users@lists.apple.com) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/colorsync-users/rtelhan%40icloud.com This email sent to rtelhan@icloud.com
Dumb question: what illumination spectrum is assumed in the profiling? Is the viewing illumination spectrum different? In other words, could this be a small metamerism effect due to the different inks under the viewing illumination?
On September 26, 2019 at 9:57 AM Roger Breton via colorsync-users <colorsync-users@lists.apple.com> wrote:
Hi everyone,
I'm working on profiling two different Epson printers, a 7800 and a 7890.
Even though both printers are using the same, exact substrate, is it to be expected that there would be some "slight (but visible) differences" between the two printers? (I know I can't show you the prints.)
I convert from GRACol2006 to the 7800 and from GRACoL2006 to the 7890, using absolute colorimetry in both cases. Same conversion, same substrate, the only difference is the two printers.
In your opinion, what could account for the slight differences I observe? Is it possible (that's my best take) that the difference in the generation of inks used on both of these printers could account for the slight differences I observe?
Best / Roger Breton
www.graxx.ca
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participants (4)
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Claas Bickeböller
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graxx＠videotron.ca
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Refik Telhan
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WAYNE BRETL