Printing & Image mode

DH
Posted By
David Hitchin
Oct 28, 2003
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493
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4
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Closed
Image modes include CMYK for which out-of-gamut warnings are available, but most photo printers now use at least 6 colours. There doesn’t seem to be a mode for 6-colour printing which can check gamuts in the same way.

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T
tacitr
Oct 28, 2003
Image modes include CMYK for which out-of-gamut warnings are available, but most photo printers now use at least 6 colours. There doesn’t seem to be a mode for 6-colour printing which can check gamuts in the same way.

6-color consumer inkjet printers use cyan, magenta, yellow, black, light cyan, and light magenta colors. The light cyan and light magenta are there to reduce the appearance of dithering in the image. They don’t increase the gamut.

However, the inks used in a consumer printer are not the CMYK inkes used on a press. In particular, the cyan ink is brighter and bluer than the cyan ink used in CMYK offset printing. The gamut warnings you see in Photoshop assume CMYK offset ink, and isn’t necessarily calid for the inkjet printer’s own particular variety of CMYK.

Consumer inkjet printers expect RGB, not CMYK, data.


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D
dvus
Nov 1, 2003
Tacit wrote:

However, the inks used in a consumer printer are not the CMYK inkes used on a press. In particular, the cyan ink is brighter and bluer than the cyan ink used in CMYK offset printing. The gamut warnings you see in Photoshop assume CMYK offset ink, and isn’t necessarily calid for the inkjet printer’s own particular variety of CMYK.

What with the explosion of digital photography and the improved quality of ink-jets, do you think there will be a move to include gamut warnings for the high-end home printers any time soon?

dvus
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tacitr
Nov 3, 2003
What with the explosion of digital photography and the improved quality of ink-jets, do you think there will be a move to include gamut warnings for the high-end home printers any time soon?

In Photoshop? Unlikely. Photoshop would have to know the details about the exact color model and primary inks used by each type of printer on the market. Often, this information is proprietary.


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B
bhilton665
Nov 3, 2003
What with the explosion of digital photography and the improved quality of ink-jets, do you think there will be a move to include gamut warnings for the high-end home printers any time soon?

Just load the printer profile for the paper you’re using like you’re soft proofing (View > Proof Setup > Custom) and select View > Gamut Warning) and it already does this, starting with version 6. I do this all the time … but you need good profiles.

Bill

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