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Technical information on PDF workﬂow

Overprint mode

What is a Overprint mode

Overprint mode (OPM) deﬁnes the operation mode for overprinting text as is and is described

within the PDF.

In the RIP, the way that overprints that include this PDF are processed changes, depending on

this OPM description.

It is not necessary to be conscious of the OPM in a general DTP workflow, such as the one

described in this document, but there are exceptions, and in some special PDF workﬂows, it

may not be possible to obtain proper output if you are not conscious of this OPM.

The two overprint modes

There are two operation modes for overprint mode.

/OPM 1 : NON ZERO OVERPRINT

Interpretation of color value 0% = No color

The bottom object is made transparent

Cyan

Magenta

Yellow

Black

Output results

Forward (DeviceCMYK)

*1)

Backward (DeviceCMYK)

*1)

No color (The bottom object is made transparent)

/OPM 0 : FULL OVERPRINT

Interpretation of color value 0% = There is a 0% color

0% color is painted from the top

Cyan

Magenta

Yellow

Black

Output results

Forward (DeviceCMYK)

*1)

Backward (DeviceCMYK)

*1)

There is a 0% color (0% color is painted from the top)

e.g. )

The normal mode is "/OPM1", and the description in "Overprint" (P19) in this document

illustrates the workﬂow when you select "/OPM1".

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Trueﬂow DTP Output Guideline The 14th Edition

Overprint mode

OPM affected only by

DeviceCMYK

This means that if the proper overprint deﬁnition is "no separation color", the following object

colors are made transparent.

It is also possible to say that the OPM deﬁnes whether or not to interpret 0% as "no color".

It is necessary to deﬁne a 0% color value for unwanted CMYK separations in DeviceCMYK, and

it is the OPM that deﬁnes this interpretation of 0%. Therefore, in the DeviceCMYK color space,

the OPM settings can be said to affect only the objects set with overprints. The OPM setting

does not affect other object processing.

• Effects of OPM on different color spaces

Object color space

OPM effect

Remarks

DeviceCMYK

Affected

Because it is necessary to deﬁne a 0% color value.

DeviceN / Separation

Not affected

Because it is not necessary to deﬁne a 0% color value,

since color values are set only for the required separations.

DeviceRGB / DeviceGray

*1)

Not affected

Because the deﬁnition is for logical colors, not

separations.

e.g. 1 ) Forward is [Device CMYK] ([ /OPM 1] [/OPM 0] different)

Cyan

Magenta

Yellow

Black

Spot 1

Output results /OPM 1

None

Output results /OPM 0

None

Forward (DeviceCMYK)

None

Backward (DeviceCMYK)

None

e.g. 2 ) Forward is [Separation] ([ /OPM 1] [/OPM 0] same as)

Cyan

Magenta

Yellow

Black

Spot 1

Output results

Forward (Separation)

None

Backward (DeviceCMYK)

None

e.g. 3 ) Forward is [Device N] ([ /OPM 1] [/OPM 0] same as)

Cyan

Magenta

Yellow

Black

Spot 1

Output results

Forward (DeviceN)

*2)

None

Backward (DeviceCMYK)

None

*1)

DeviceGray may be converted to

a DeviceCMYK K separation in the

application or the RIP, and if this happens,

overprints are applied and the OPM

setting has an effect.

DeviceGray is converted to the

DeviceCMYK K separation in Trueﬂow as

well.

In addition, objects defined as Gray

in Illustrator 9 or later are output as

DeviceCMYK (DeviceN, depending on

the processing), so they are overprinted.

In the figure to the right, Device N is in

back and individual color spaces are in

front.

*2)

To specify colors that include spot

colors using DeviceN format, use "Mixed

Ink Swatch" in InDesign CS2 / CS3 / CS4

and "Multi-Ink" in QuarkXPress.

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Technical information on PDF workﬂow

Overprint mode

Overprint mode settings for

Acrobat Distiller

Normally, it is not necessary to be conscious of the OPM setting, but in Acrobat Distiller, you

can change the OPM setting.

The advanced setting of Adobe PDF Settings Dialogbox for "/OPM 1" is to check the

"Overprinting default is nonzero overprinting" checkbox, and this is the default.

If you change this setting, there may be differences between the overprint preview in the DTP

application as well as the Acrobat display and actual output results, so for normal workﬂows,

this setting should not be changed.

Proper overprint operations

In the PostScript or PDF standard that existed before the OPM concept was defined, a

prerequisite for overprint operations was an operation such as "/OPM 0".

However, this was designed to make it possible to obtain results like those from setting "/OPM 1"

for DeviceCMYK overprints if the data was separated and output from Illustrator, so the output

differed from when composite PostScript was separated in the RIP.

To resolve this problem, we introduced the concept of OPM as a RIP processing mode for

achieving the same results from different output.

After this, speciﬁcation in Illustrator was implemented in InDesign as well, and the overprint

preview was also made into an "/OPM 1" preview.

This means that it is derived from the overprint speciﬁcation in Illustrator, and in Acrobat Distiller

5 and earlier versions, the OPM setting was described as "Illustrator Overprint Mode". This

means the same as the "Overprinting default is nonzero overprinting" in Acrobat Distiller 6 and

later versions.

In a CPSI-based RIP that processes PostScript such as SCREEN's AD-810MX, the CPSI core is set

to operate as "/OPM 0", but it has become possible to RIP using "/OPM 1" in the AD-810MX as

necessary by setting "Apply process colors".

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Trueﬂow DTP Output Guideline The 14th Edition

Speciﬁcation of spot colors

Accurately specifying spot

colors

Converting data containing spot colors that were specified when the data was created into

process colors during output (proxy colors) causes problems under a wide variety of conditions.

It is possible to convert spot colors to process colors and output even from Trueﬂow, but it is

important to set whether to convert the spot colors to proxy colors using process colors or handle

them as spot color separations as they are in advance in the DTP application, and then ﬁnalize

the spot color settings in the PDF.

This is because even if the input data is the same, it is controlled in the RIP, so spot colors are

handled differently depending on whether the RIP is set for spot colors to be converted to proxy

colors and printed or whether the RIP is set to handle the spot colors as is. Therefore, the results

vary and may not appear as intended depending on the output environment.

By correctly setting how the spot colors should be handled before creating a PDF file, it is

possible to output the same results in any output environment.

However, it is necessary to be careful because if there are transparency or overprint effects, as

described in "VI. Transparent areas are output as overprints" (P28) , transparency effects must

be handled as overprints, and the overprints will not be as expected at the point when they are

converted to process colors.

This is described in more detail in the next section.

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Technical information on PDF workﬂow

Speciﬁcation of spot colors

Applying transparency effects

and overprints to spot colors

If transparency effects or overprints are applied to spot colors, the expected results are almost

never achieved if the spot colors are converted to process colors in the RIP for output. If

transparency effects are applied to spot colors in Illustrator CS2 - CS5, the following message is

displayed when the data is saved as EPS, reporting the condition.

If overprints are applied to spot colors, this message is not displayed, but similarly, the data is not

output as expected.

Speciﬁc cases where transparency effects and overprints are used are shown below, but the spot

color settings are only made at the stage when the data is created for the areas where spot colors

are actually output, and loading spot color information and overprints into the RIP is only one

method of solving the problem.

Applying overprints to spot

colors

When overprinting true spot color separations, spot color inks are printed in the areas where the spot

color objects and other objects overlap using separate separations, so the output is a mix of both

types of objects. However, the results are completely different when those spot colors are converted

to process colors and overprinted as compared to when they are output as spot color separations.

[ Forward ]

PANTONE 340 C

Overprint & Opaque

[ Forward ]

PANTONE 143 C

Overprint & Opaque

C100, M0, Y66, K9

C0, M35 Y85, K0

Output with spot color

conversion into

process colors

Output without

spot color conversion

PANTONE 340 C

PANTONE 143 C

[ Backward ] C100

It is important to use the colors that are generated when the spot colors are converted to process

colors at the stage when the data is created, and always turn on "Overprint Preview" to check

the output results in advance. If you convert to process colors in Trueﬂow, you cannot check the

output results in advance, so it is not possible to guarantee that the output will be the same as

what appears on screen.

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Dainippon Screen Mfg. Co., Ltd.

Trueﬂow DTP Output Guideline The 14th Edition

Speciﬁcation of spot colors

Spot color transparency effects

As described in "VI. Transparent areas are output as overprints" (P28) , generally if objects

with transparency effects overlap objects with spot colors, some of the transparency settings are

converted to overprints and the data is saved.

As described in "Applying overprints to spot colors," if objects with transparency effects are

unexpectedly converted to overprints in this way, the results are completely incorrect. To achieve

the expected results, the rule is to output spot colors as spot colors using separate separations.

Of course it is critical to set up the overprint loading and spot color loading correctly in the RIP,

and if they are not loaded, this will cause serious problems in the output.

Drop Shadow (=Transparency)

Spot

Overprint

Data is

output

Output

in Trueflow

[ Overprint=OFF ]

e.g. )

Image

As shown in the example above, it is necessary to be careful because problems occur not only

if transparency effects are set for spot color objects themselves, but also when there are other

transparent objects.

If you use the colors speciﬁed as process colors in advance rather than spot colors, these types of

problems do not occur.

Ways to convert spot colors to

process colors

To resolve these problems, we introduce two ways to convert spot color objects that are not to

be output using spot color separations into process colors in the DTP application.

When the colors are converted, the behavior of the transparency effects and overprints may yield

unexpected results. It is necessary to check this behavior by displaying overprint previews.

You cannot check them if you convert to process colors in the RIP. If you convert spot colors

to process colors, be sure to always check the conversion results at the stage when the data is

created, before RIP'ing.

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Technical information on PDF workﬂow

Speciﬁcation of spot colors

I. [Swatch Options] setting

Convert the colors in the document using "Swatch Options".

1. It is possible to check the spot color state and change the settings for each color from the

Swatches palette.

Select "Swatch Options..." from the submenu (or double-click the swatch to be edited in the

Swatches palette) to display a dialog box.

2. In the Swatch Options dialog box, set as shown below and then click the OK button.

Colour Type

Process

Colour Mode

CMYK

Icons on the Swatches palette

In this example, the setting procedure

is described using InDesign CS5. The

procedure is the same when InDesign CS

- CS4 or Illustrator CS - CS5 is used.

When you import other application data

that includes spot colors into InDesign,

the deﬁnitions of the spot colors used in

the InDesign data can be changed, but

they can only be changed to InDesign's

color format.

To modify a color in the original

image, you must define the color in the

application that was used to create the

image.

Dainippon Screen Mfg. Co., Ltd.

Trueﬂow DTP Output Guideline The 14th Edition

Speciﬁcation of spot colors

3. Check that the icon to the right of the list has been changed.

This completes the setting.

II. [Ink Manager] setting

Changes to the colors in the document set in "Ink Manager" are not made, but rather the colors

are converted during output. With this conversion, spot colors in imported Illustrator data can

also be converted to process colors at the same time.

Of course it is also possible to set batch conversion of all of the spot colors to process colors for

each separation.

1. Display the "Ink Manager" dialog box in one of the following ways.

• Swatchs palette menu

• Separations Preview menu

• [ Output ] in "Print" dialog box

• [ Advanced ] in "Export PDF" dialog box

2. Icons are displayed to the left of the individual colors.

If you click the spot color icon on the left, it changes to a process color icon. This ﬁnishes

the setup.

In addition, if you want to convert the spot colors to process colors in batch, turn on "All

Spots to Process". All of the spot colors are converted to process colors.

In this example, the setting procedure

is described using InDesign CS5. The

procedure is the same when InDesign

CS - CS4 or Acrobat 7 - 9 is used. You

can make the same settings in the "Print"

dialog box in Illustrator CS - CS5.

In "Ink Manager", it is also possible to

output spot colors with different names,

such as "Green1" and "Green2" using the

same separation.

If Illustrator EPS format data is imported

into InDesign, objects are already divided

at the point that the EPS is created, and

converted to overprints after that, so

unexpected results may occur.

If unexpected colors are appear in

the overprint preview with these ink

management settings, it is necessary to

edit the original data in Illustrator.

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Technical information on PDF workﬂow

Bleed

One of the PDF/X requirements is that "the media size and the trim size or art size must be

properly deﬁned in PDF (bleed is optional)". Even if these settings are not deﬁned correctly, the

PDF/X-1a data passes Preﬂight in Acrobat.

However, it is important to set the speciﬁed items in the DTP application and the RIP in order to

correctly output the PDF/X-1a data, including the bleed area. This section presents information

that should be noted in order to output the PDF/X-1a data correctly.

TrimBox / BleedBox /MediaBox

It is possible to add information such as TrimBox (trim size), BleedBox (bleed size), and

MediaBox (output media size) to PDF.

When PS is output from a DTP application and then it is used for imposition in another program,

PS will be positioned with reference to the origin of the ﬁnished page. Therefore, the information

for page origin, size, and bleed area is important.

• Box settings and application notation

InDesign

QuarkXPress

TrimBox

Trim size

(actual ﬁnal page size)

Page size

BleedBox

Bleed size

(actual page size + bleed area)

Bleed

MediaBox

Media size

(output media size encoded in PS)

Paper Size

Support in each application

What is important if you output PS from a DTP application and impose it in different software is

the page origin and size as well as the object bleed area information.

In InDesign, it is possible to create PDF with TrimBox and BleedBox information (the resulting

PDF is the same as when you convert PS output from InDesign to PDF in Distiller 5 or later).

Also, in QuarkXPress 6 or later, when PS is created with register marks, Trueﬂow can import the

TrimBox and BleedBox information.

Using this page information, DTP applications can import/export the origin and bleed

information correctly without the paper size setting being changed from "Auto", regardless of

whether it is a double-page spread or single-page data.

Dainippon Screen Mfg. Co., Ltd.

Trueﬂow DTP Output Guideline The 14th Edition

Bleed

PDF

InDesign CS - CS5

Illustrator CS - CS5

QuarkXPress 6.5

*1)

QuarkXPress 7.0/8.1

Conﬁrmation on Acrobat 7 - 9

You can visually check the individual Box settings in Acrobat 7 - 9 Professional.

Since this function is off as a default setting, select "Preference" - "Page Display" from the menu,

and then turn on "Display art, trim, bleed boxes". Once the Acrobat function is activated, each

area will be displayed using different colors.

As shown in the figure in "TrimBox / BleedBox /MediaBox" (P37) , the TrimBox (green line),

the Bleed box (blue line), and the MediaBox (paper area).

Setting the "PDF Origin" on

Trueﬂow

When PS or PDF data is input, of the three parameters that are accurately encoded, the box that

will be the origin is speciﬁed.

[ TrimBox ] : Loads the PS or PDF data using the trim size.

[ BleedBox ] : Loads the PDF data using the bleed size.

[ MediaBox ] : Loads the PDF data using the media size

Specify the PDF origin during the Trueﬂow input processing.

If you input PS or PDF output from a supported application, you can set TrimBox as the PDF

origin.

*1)

The Japanese version is supported

by the PDF Boxer XTension, which is

distributed by Quark, Inc. (English version

6.5 has already been supported.)

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