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PRINT GOCCO 'Full Colour' [CMY] and CMYK Designs

Using a computer [or PG Digital in this example] to colour separate a photograph - you can print CMYK designs in the PRINT GOCCO PG-11 machine.


PG-11 machinePrinting System Required

For Process colour printing there is only one PRINT GOCCO model to be recommended - PRINT GOCCO PG-11. This model has advanced registration features which enable the fine details registration of the multiple colours.
NB: The CD-Printer B6 model also has similar registration features.

Printing of this style requires professional registration, and whilst other PRINT GOCCO models  [i.e. PG-5] can be used, a long self registration process is required with the quantity of miss-prints and unaligned images is very high.


Colour Separating Your Photograph

You need to break down your photograph into the CMYK [Cyan, Magenta, Process Yellow & Black] for the printing process - this usually done on a computer using a program e.g.  Adobe PhotoShop

The colour separation process into CMYK on the computer is not a novice task as this involves changing the pictures colour scales, dot gain and angle, black generation & limit - plus many more features for an accurate result.

Why Black [K] is not printed with PRINT GOCCO
RISO have produced artwork books for the PRINT GOCCO system with only CMY colour separations - no black. The reason for this is that RISO do not produce a true process black ink, which would be slightly more transparent when printed than the highly opaque HM Black Paper ink [Order Code: S-492].

In this example we have separated a colour photograph using a RISO PG Digital system, which removes all the hassle of separations on a computer.

Important Note
The PG Digital machine, pictured right, is a special system developed by RISO Kagaku Corporation of Japan for use on their domestic market only. This system is NOT available outside Japan.
The sample machine used is strictly for examination and testing purposes only.
We request that you do NOT contact RISO and enquire about the release of this machine - your understanding is greatly appreciated.

Original Artwork

Original ArtworkWe selected our colour photograph, in this case NEHOC Australia's founder Mr Stan Cohen pictured right.

In hindsight out artwork would have been best with a lighter background [not a dark brown couch & wooden wall].

How the screens were made 

Imaging in PG DigitalThe photograph was inserted onto the artwork holder and placed into the left of the machine - a PG Digital Master into the Right.

The CMY option was selected and the PG Digital automatically separated the Cyan Layer from the Artwork on the first pass.

This process was repeated for the Magenta & Process Yellow screen [3 screens in total].

Printing the Design

Pat Printing the LayersCMY process is generally printed as the abbreviation suggests - Cyan followed by Magenta and Process Yellow last. The printing process is the same for normal PG-11 prints however the design must of course be registered first. Pictured right is Pat Gittins printing the Magenta layer.

3 Colour Prints
Here is all three layers of the 3 design in the 3 individual colours [Cyan, magenta & Process Yellow]:
In Detail
Let's break a section down and enlarge the size to highlight the dot structure in the print.

  + + =

The CMY completed design 

When you compare this to the original photograph [above] this CMY is the best reproduction we have ever seen PRINT GOCCO perform.

The ability of the PG Digital system to accurately separate the design into the CMY separations, blows away computer separation in both terms of time and effort required.

The other benefit is that the PG Digital system produces smaller, more accurately placed dots.


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