Roland PC-600 - Manual (Page 11)

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Screen - The default settings will produce the best quality possible. We do not recommend to change these settings,
since changing them can cause uneven colors.
Perform Color Correction- Checking this setting makes incoming jobs use the color correction settings- ICC input
and output profiles that are explained below- of Roland COLORCHOICE RIP Software. If this setting is not checked,
incoming jobs are assumed to already have color correction.
ICC input profile- This area is only accessible if Perform Color Correction is checked. Three types of ICC input
profiles can be specified:
• CMYK has a default setting of High end Swop. You also can specify a different CMYK profile using the Add
button.
• RGB corresponds to monitor profiles. In addition to the Generic setting, which will provide good results,
you can select other popular monitor ICC profiles.
• Gray is the gray component ICC profile. Accept the default setting or use the Add button to locate another.
With input profiles, you can accept the default setting for all three profiles and expect excellent results. The ability to
specify new profiles is an advanced feature, and you should use it only if you have a thorough understanding of ICC
profiles and how to apply them.
ICC output profile
• Profile: Output profiles define the characteristics of your printer. An ICC profile is made for each ink/media
combination that is available for a device. From the pulldown list you can choose the profile that is
appropriate for your job.
• Image and Vector Rendering Intents: Before a file can be RIPed, its ICC profile must be translated into CRD
(Color Rendering Dictionary) values. This is essentially the process of truncating RGB color space to CMYK
color space. How to truncate this space is determined by the color rendering intent that you select. Select a
rendering intent from the list of standard PostScript types. With Roland COLORCHOICE you can specify
separate rendering intents for vector images and bitmap images. Vector images include lines, circles, text, and
other non-bitmap images. Bitmap images are any non-vector elements such as photos, or other elements that
consist of a pattern of individual dots, and not lines or curves.
Perceptual is best for photographic images. The relationship between colors in the original is scaled
proportionally to fit the output device’s color gamut.
Relative Colorimetric When a color in the current color space is out of gamut in the target color space,
it is mapped to the closest possible color within the gamut of the target color space, while colors that are
in gamut are not affected. Only the colors that fall outside of the destination gamut are changed. This
rendering intent can cause two colors which appear different in the source color space to be the same in
the target color space. This is called "clipping".
Absolute Colorimetric Colors match exactly with no adjustment made for white point or black point
that would alter the image’s brightness. This intent works well with logos and other design elements, were
exact matching is important.
Saturation is best for images where true color matching is not as important as vivid colors. Colors
outside of the output device’s gamut are converted to colors within the same saturation but with a
different lightness. This intent may be used to boost colors within a photographic image.
Spot Color is best for use with vector images. This intent, which produces the greatest saturation
possible, should only be used with non-photographic images.
• Info: Click this button for information pertaining to the ICC output profile that has been chosen under
Profile. This dialog box contains a variety of information about the selected profile, including the ink and
media names. If you are not sure whether or not you are using the correct profile, be sure to view this
information. Following are a few guidelines to help you identify a profile:
ResOrGr indicates calibration for Resin ink using Cyan, Magenta, Yellow, Black, Orange, and Green. Wax are
calibration for wax ribbons.
Profiles ending with “1200” should be used for 1200 x 600 dpi resolution. Profiles ending with “600”
should be used only for 600 dpi printing. If a name contains none of the above descriptions in it, then it is
appropriate for any resolution