|Frequently Asked Questions
Why we need Calibration in VisualDot?
Dot sharpness is controllable parameter. However, it is very
sensitive on the proof output.
People are expecting as hard (sharp) dots as possible on inkjet
proof too, just like the same look with press.
However, if we making the dots sharper at very higher level,
unexpected moire can come up or smooth shades
can appear with steps in it.
We improved dot-generation algorithm for each color screen
now. Furthermore, new version is providingmore structured
process to get the best sharpness by controlling sharpness
of each color screen differently.To find the best optimized
(as sharp dots as possible without any Moire problem), it
is highly recommendedto proceed Calibration process. It is
important to calibrate your Dot-proofing environment before
output. Each different Rip software and Color Management Workflow
has its own characteristics and parameters which make effect
on quality on Dot-proof and Press output.
Currently VisualDot¡¯s default sharpness is optimized to EPSON4000+TOPAZ
It is required to find the best optimized condition of sharpness
control of your own dot-proofing environment,
Because the environment varies due to different rip software¡¯s,
proofers, papers and original 1 bit TIFF images.
Please find Colorchart.PDF or Colorchart.PS file which is
located installation folder of VisualDot (e.g. .../Programfiles/codelsystems/visualdot/...).
Load the Colorchart image with your own PS Rip software
and create 1 bit TIFF images by parameters like resolution,
line per inch, screen type, screen ruling and etc. as the
same with those are going to be used for final
press output and dot-proofing. After creation of 1 bit TIFF
images, open those with VisualDot software.
Now it is required to calibrate the "Sharpness of Dots"
as the maximum sharpness without unexpected moire effect.
Generally too vivid (clear or sharp) Dots can cause unexpected
Moire effect on the proof output.
To find the optimal level of sharpness, VisualDot supports
"Sharpness Control of Each Color Plate" as the below
image. Go to "Make file for Proofing" and create
dot-proof image for the first time. Print it with your proofer
and check if there's any moire effect at any position of C,
M, Y, or K. If you see unexpected moire in C, this means
the Dot Sharpness of Cyan screen is too sharp in a certain
condition and you need to set the level of C sharpness at
lower position. If you cannot see any moire in K, this means
you may have more room to increase the sharpness of K screen
by adjusting the level at higher position. With this kind
of trials and errors, you'll be
able to find the optimal sharpness level for each color screen
to get the best dot-proof output with maximum sharpness later.
2. How can I enable Automatic recognition of 1 bit TIFF file
names, especially for Spots
There's very convenient way of multiple file loading. By
defining naming rules of your own for your TIFF files, you
can load TIFF files set at once, with automatic color plate
placement. This is very important for automatic process using
DotBatch program. For sorting of files, the list can be sorted
by "TIFF JOB name", "TIFF FILE name" or
With selection of TIFF JOB name, files will be sorted by internal
job name with color information.
With selection of TIFF FILE name, files will be sorted by
physical file name and it is required to build a customized
naming rules to import each separate file as a composite at
once. To add and edit your own naming rules for importing
TIFF files, press 'TIFF File Type...¡® button in the File Browser
dialog window and define your own naming rules.
To define a naming rule of TIFF FILE NAME for Spot color plates,
it is recommended to use <Color> rather than <C>,
because a single alphabet cannot stand for a specific spot
color. If each color separated files are named by rules registered
in 'TIFF file type' setting, you can easily select combined
set of files by activating 'Compose page' option.
The original list of TIFF files will be simplified into the
right window where sets of TIFF files will appear by combining
TIFF files with the defined naming rules. Select a single
set of TIFF files and press 'OK' to load the TIFF file set.
Placing into the each color plate will be done automatically.
3 How many SPOT colors can I use and save in the library?
New version 1.5 supports importing up to 4 SPOT colors for
a single composite image. This will be extended into 12 spot
colors very soon, to meet very professional users in the field.
In the Spot Color Library of new version, basic Pantone color
index is available as default. When any of your 1 BIT TIFF
images are using Spot Color which is not available in Pantone
index, you need to define the customized RGB value of the
Spot Color here in advance. Spot colors can be added as many
as you want in the library.
Users can add/modify/delete spot colors in the library without
limitation. You can create as many spot colorsas possible
if you need. However, please remember that the name of Spot
Color is very important for automatic recognition of each
4. What kind of Dot-proof output format can I generate?
Proof image file format can be selected between 32 bit composite
TIFF, 8 bit separate TIFF, PDF and PS formats. Resolution
of proof image can be determined between 300, 360, 600 and
720 DPI resolution is recommended for Epson printers and 600
DPI resolution is recommended for HP and Canon printers. During
creation of proof image you can select compression type as
None, Packbit or LZW.
Image quality can be also adjusted in the slide bar controller.
With moving the slide to the left, screen dots will be generated
more clearly for each color screen. Too vivid (clear or sharp)
Dots can cause unexpected Moire effect on the proof output.
You're advised to calibrate the environment of Dot-proofing
first to get the maximum sharpness of the output before dot-proofing.
When creating proof output image in 8 bit Separate TIFF format,
TIFF images for each color plate will be generated as 8 bit
data. This can help your enhanced color management in your
own color proofing software.
The names of separate TIFF files will be like below;
JOBNAME(Cyan).TIFF, JOBNAME(Magenta).TIFF, JOBNAME(Yellow).TIFF,
JOBNAME(Black).TIFF, JOBNAME(Spotcolor1).TIFF, JOBNAME(Spotcolor2).TIFF
5. Would you be more specific for MIMO ENVIRONMENT, I mean
Visual DotBatch is Automatic processingmodule for prompt
Dot-proofing workflow without manpower.
DotBatch monitors multiple Hotfolders for file input and automatically
convert separated 1 bit TIFF files into 32 bit
composite or 8 bit separate Dot-proof file and Preview image
file and those files can be saved into different folders specified.
Parameters including Spot colors, Resolution, File format,
mirroring and other settings can be differently
defined to each hotfolder to generate Dot-proof file and Preview
file as expected in various options automatically under the
differently defined output folders.
6. VisualDot is using another Rip software, so the screen
of the Rip will spoil the Dots.
That¡¯s not true.
Without regarding the Rip software, the proofer machine is
also using error diffusion dithering patterns.
However, the screen is applied to the image when there¡¯s a
change of size (down-sampling or up-sampling).
If you create the Dot-proof image and rip/print the image
at the same resolution, you need not worry about the problem.
7. Positive points in common
We found that our partners and customers generally agree
with the listed positive points of VisualDot.
- Speed is impressive
- Hot-folder mode is very useful, especially for multiple
input and multiple output with each different settings
- Interface for soft dot-proofing like zooming, panning and
other analysis tools is user-friendly
- The structure is very flexible (compatible with any kind
of 3rd party solutions)
- Quality is very impressive through structured calibration