........Features Summary


Dot-for-Dot SoftProofing

Dot-for-Dot inkjet Proof printing
  • Collection of TIFF Information like size, resolution, compression methods and etc.
  • Powerful preview of 1 bit TIFF from PS Rip
  • Merge separate image and Save image in different format (32bit TIFF, JPEG, BMP, PDF) with various compression methods
  • Rotation, Inversion, Mirroring, Zooming...
  • Analysis of screen angle for each plates
  • Save preview images in different format and
    resolutions (TIFF, JPEG, BMP, PDF)
  • Checking of CMYK saturation rate for selected area (checking overprint rate)
  • Checking of CMYK saturation rate for each defined column or row
  • Checking distance between dots
  • Checking overprint by analyzing CMY / K value
  • Built-in Panton Spot color library for SoftProofing
    Customizable Spot Colors in the library
  • Simulate press screen on inkjet proof printing
    (screen ruling, angle and dot shape)
  • Fine image reproduction - including rosettes, moire,
    fine line work and 1 pt text
  • Pre-adjust dot geometry and dot gain in flexo printing applications to ensure matching proof and print down to dot level
  • Adjusting resolution of proof to different printers
  • Dot-proof image creation in various resolution
    and file formats (32bit TIFF, 8bit separate TIFFs,
    JPEG, PS, PDF)
  • Spot color plates can be loaded up to 4
    (This will be upgraded to support up to 12 soon)
  • Creating Separated 8 bit TIFF images for each plate
  • Dot Sharpness Control by adjustment of screen
    sharpness of each plate with securing the best
    result with preventing unexpected moire effect

Benefits of Dot-proofing

The only problem is that most use screening technologies which are not really screens at all. At least not as we know them in the offset world, i.e. lines per inch. Instead they use techniques known as dithering, error diffusion or frequency modulation. The benefit of these processes is that they produce a smooth continuous-tone quality and work well with color management to produce accurate color. The problem is that they mask the many imperfections of the four-color process.

Even there¡¯s the same color saturation value between continuous color proof and dot proof, human eyes will feel colors on dot proof are much more similar to the press color, due to the existence of screen patterns.

One of the benefit from dot-proofing is known as ¡®Detecting moire¡¯.
One of the most notorious of the ¡°process¡± imperfections is moire and this happens when the four-color screen angles misalign. The result is that unpleasant wavy pattern we all know so well. This is called a screen or color moire. Then we have what is known as subject moire. This happens when a busy pattern in an image, such as a checkered fabric, interferes with or complicates the screen angles.
For advertising proofs, you usually want the best color match. But for overall quality control, you should be proofing with the same file that will image the printing plate. Luckily, inkjet technology has come a long way. At a resolution of 720 dots per inch and using screening software, an inkjet proofer is capable of reproducing a halftone screen at 85 or 100 lpi.

As many of dot-proofing solution providers are promoting, dot-proofing is said to be able provide 200 lpi proof with 720 dpi proofers. This means a single cell which can present 257 gradation levels at 3200 original DPI will be limited to 3.6X3.6 (about 14) gradation levels. VisualDot is overcoming this limitation with using 8 bit conversion and HIFI inkjet technology like variable dots and diluted inks, but the shape of dots with limited number of inkjet droplet spots cannot be said to perfectly predict 100% of moire in this case. Dot-proofing technology is not a kind of magic and it is depending on the performance of proofer machines. In this regards, you¡¯d better regard the purpose of dot proof as ¡®to more press-look proof output¡¯ rather than ¡®to predict moire of press perfectly¡¯, when you¡¯re creating dot-proof of 200 lpi at 720 DPI.

Another reason for the limitation in detecting moire with dot proof is the existence of additional color spots in inkjet proof. Inkjet inks have a much wider color gamut than offset inks. So the system¡¯s color management software re-maps the inkjet gamut to match the offset gamut, blending the colors accordingly. As a result, it adds dots that are not normally present in the CMYK rosette. This is especially true with six-color proofers. While six colors provide an even wider spectrum for matching special colors and different presses, they add more dots to achieve the right blend.

In summary, theoretically it is impossible to create the same look of press with lower resolution inkjet proof.
But we can create as similar look of press as possible with using dot proof technology. This means, customers will get the proof output, at least better and more accurate than continuous color proof output.
You¡¯ll find the difference in colors and details by simple adoption of VisualDot module into the current proof workflow.

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