Re: [photoshop-beginners] colors

Yes, they use CMYK ink, but they accept RGB data values and convert
them to CMYK in the printer.

From page 426 of the CS5 help .pdf:

About desktop printing

Unless you work in a commercial printing company or service bureau,
you probably print images to a desktop printer, such as an inkjet,
dye sublimation, or laser printer, not to an imagesetter. Photoshop
lets you control how your image is printed.
Monitors display images using light, whereas desktop printers
reproduce images using inks, dyes, or pigments. For this reason, a
desktop printer can't reproduce all the colors displayed on a
monitor. However, by incorporating certain procedures (such as a
color management system) into your workflow, you can achieve
predictable results when printing your images to a desktop printer.
Keep these considerations in mind when working with an image you
intend to print:

•If your image is in RGB mode, do not convert the document to CMYK
mode when printing to a desktop printer. Work entirely in RGB mode.
As a rule, desktop printers are configured to accept RGB data and
use internal software to convert to CMYK. If you send CMYK data,
most desktop printers apply a conversion anyway, with unpredictable
results.

On Tue, 10 Jan 2012 21:20:15 -1000, Don
<y-groups.96705@hawaiiantel.net> wrote:

>Keith:
>
>ALL inkjet printers use CMYK ink. The printer manufacturer supplies a driver which only accepts an RGB image and converts it to CMYK as part of the rasterizing process.
>
>There are RIP programs that replace the driver provided by the printer manufacturer which will process CMYK images but they cost more than most inkjet printers.
>
>Don at 21.9N 159.6W
>2x2.93 GHz Mac Pro
>Canon EOS 5D
>
>On Jan 10, 2012, at 07:46, Keith E. wrote:
>
>> On Mon, 09 Jan 2012 15:29:23 -0700, SueK <sue@kinzelman.com> wrote:
>>
>>> So does that mean an ink jet printer which is most likely (CMYK) cannot
>>> print out the pure colors of red, yellow and blue, if they are specified
>>> in RBG?
>>
>> Inkjets use RGB, not CMYK.
>> --
--
Keith E.
Excrementum casus

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