What is CMYK color space?
The CMYK model depends of the absorption on the paper.
When white light hits color that is permeable to light
a part of the color system is absorbed.
The other part is reflected to the eye.Theoretically,
a pigment mixture of pure Cyan (C), Magenta (M), and
Yellow (Y) absorbs all of the light and creates black;
thus, they are called subtractive colors. But, because
inks for printing contain also pollution this mixture
results in a dirty brown and has to be mixed with black
ink (K) to be able to create real black.
Which color mode should I use to create and save
my images: CMYK or RGB?
All printers supported by PosterPrint print in CMYK
mode, eventually with additional colors.
This means that PosterPrint has to send the images
in (expanded) CMYK mode to the printer. For the same
(expanded) CMYK values of a the printed color shade
depends on the used ink and used media.
Internally, PosterPrint uses the device independent
Lab mode. RGB image are converted with help of input
profiles (e.g. for scanners) to Lab values. The Lab
values are converted into (expanded) CMYK values
with help of printer profiles, which are especially
created for the used combination of ink and media.
This causes that two similar images that are only
printed on different media look similar (considering
that possibly one media is brighter than the other).
When CMYK images are printed the colors are not converted
so that the color shade of the images highly depends
on the used media.
The following requirements must be fulfilled that
PosterPrint is able to use the color management:1)
The image must be of type RGB TIFForthe (Encapsulated)
PostScript files must have been converted into
RGB by the PostScript RIP (not recommended). 2)
A printer profile must be used. 3)
You must have assigned a RGB image data profile to
the image.
As default, no color management is used for CMYK
image data. But when you have assigned a CMYK input
profile to the CMYK image, the CMYK image data
can be converted to the device independent Lab color
space.
The printer profile can be used for these
data. Only when you have assigned a CMYK input
profile
to the
CMYK image 6 color print drivers (as e.g. for
Mimaki JV2-130) are able to use more colors than
the 4
basic colors Cyan, Magenta, Yellow, and Black
(e.g. orange
and green). The image data for Lab image files
are already stored in the device independent
format for
which the printer profile can be used.
Which color space do I have to use for my images
to be able to print them with PosterPrint?
PosterPrint
can print images with the following color spaces:-
RGB including sRGB (default RGB color
space)- Lab- CMYKBitmap files (BMP, JPG, TIFF)
normally are created using RGB colors. But several
programs like e.g. Adobe Photoshop allow Bitmap files
to be saved in CMYK or Lab color space.
PosterPrint automatically
detects the color space of bitmap files.Vector files
(PS, EPS, AI, PDF) normally are created using CMYK
colors. But several programs like e.g. Freehand allow
PostScript files to be saved in RGB color space.
PosterPrint
can not print PostScript files directly; they have
to be converted first using a PostScript interpreter.
The PostScript interpreter automatically detects
the used color spaces but is only able to convert
the data into one color space. You can specify this
color space in PosterPrint (menu Tools, command Settings,
card PostScript, field Color mode for PostScript
files). Take care that you specified the same color
space you use to save your PostScript file (otherwise
the
PostScript interpreter will convert uncontrollably).
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