Date: Fri, 29 Mar 2024 03:45:10 -0500 (CDT)
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The conversion method between the PCO and SCO decides how d=
ata is converted in order to align the color response of the&nbs=
p;SCO to the PCO. The conversion method is the type of curves o=
r DeviceLinks that ColorFlow generates in order to align the SCO color outp=
ut to that of the PCO. You can select a different conversion method than th=
e default recommendation, and later adjust the generated curves or DeviceLi=
nks in order to fine-tune the conversion.The conversion curves and DeviceLi=
nks that ColorFlow generates are available in your Prinergy Process Templat=
es in the Prinergy workflow.
Note: Depending on the DeviceLink options you choose, t=
he gamut of the SCO is either mapped or clipped. All colors from the PCO ca=
n only be reproduced on the SCO when the SCO's gamut entirely encompasses t=
he PCO's gamut. You can generate an SCO verification report to see how well the =
SCO gamut covers the PCO gamut.
- Click the Color Setups tab, and t=
hen click the desired color setup from the list to show it in the view=
er window.
- In the color setup viewe=
r, click the Conversion icon between the PCO and an SCO.
- In the Output Version box, enter =
a name if you don't want to use the default version name.
For a curve controlled device, do the following=
:
- For G7 calibration, select the G7=
check box. This selects the G7 target automatically.
- If you want the curve to be available in Prinergy,=
select the Show curves in Prinergy check box.=
li>
- In the Process Inks tab=
, from the Curves Method list, select a des=
ired method:
- Tonal Match: Refers to Tonal Value Increase (TVI)=
, also known as dot gain, and uses the calculated Effective Dot Area (EDA) =
for calibration. Calculations are based on the density measurements of each=
ink or colorant. You can use the same target response for each process col=
or, or different target responses for optimizing color builds
- Gray Balance: Adjust tonality by simultaneously c=
alibrating cyan, magenta, and yellow inks so that neutral shades of gray ar=
e maintained, while the black ink is calibrated separately for lightness an=
d darkness.
- Manual Adjustments only: Generates a linear curve=
that can be manually adjusted later
- Optionally click View Curves... to check the shap=
e of the calibration curves. If curve method Gray Balance =
is selected and the curve correction appears too aggressive in the 3/4=
-tone and shadow region, adjust the 3/4-tone Correction sl=
ider. This may occur if the 100% CMY patch has a strong cast.
- If you have added and measured one or more spot in=
ks, in the Spot Inks tab, select a target from t=
he Target list and select a curve method.
Note: For a spot ink whose response has not been measured, th=
e following settings always apply: Curves Method: None and Curves Method: Manual Adjustments Only. You can view the Curves Method for e=
ach spot ink by clicking Details=
strong> in the Conversion Definition dialog.
If you have measured the SCTV response of spot =
inks, select Target value Linear (selecte=
d automatically). This sets the Curves Method to L=
inear SCTV.
To calibrate spot inks to an EDA or TVI target,=
select any Target value other than Linear or None. This sets the Curves Method to=
Tonal Match.
To generate linear curves that can be manually =
adjusted, select Target value None. This =
sets the Curves Method to Manual Adjustments Only<=
/strong>.
- For a discontinuous flexographic SCO:
- The color in the highlight region of the PCO is typically lighter, unle=
ss the PCO is also discontinuous. If the color in the highlight regio=
n of the PCO is darker and you want to impro=
ve color match across the entire tonal region, select the Allo=
w Mindot Tint Out Increase check box.
- To adjust the transition from the Mindot to the defined curve, ad=
just the Highlight Contrast=
span> slider or enter a value in the box. For most case=
s, the default value of 70% is acceptable.
- Reducing Highlight Contrast =
produces a curve that is flatter near the Mindot, meeting the defined curve=
at a lower point but reducing contrast in this region.
- Increasing Highlight Contrast&nbs=
p;produces a curve that preserves highlight contrast, but meets the defined=
curve at a higher point.
-
To use a DeviceLink profile, do the following:
- If your ColorFlow edition is not licensed to gener=
ate DeviceLinks, from the DeviceLink Method list, select Imported and=
then click Import to import a DeviceLink profile.<=
/li>
- To generate a DeviceLink profile, from the
DeviceLink Method list, select the desired method. For =
more details, see Generating a DeviceLink profile.
Limitations: =
span> =20
- Click OK.
Note: =
If the SCO devi=
ce condition has ext=
ended process inks, they are calibrated to match the Spot Color Tone Value (SCTV) r=
esponse of same-named inks present in the PCO. For extended process inks no=
t present in the PCO, linear SCTV calibration is performed.
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