1-Bit Creator for PDF/PS Files
Some of the features described in the following may not be included in the standard GMG ColorProof version and require an additional license (GMG DotProof, GMG FlexoProof, GMG ProfileEditor, GMG ProofControl Inline, or GMG OpenColor). Please contact your local dealer for details.
If the input file is not a 1-bit TIFF and DotProof mode is used as proof mode (on the Proof Output page), PDF/PS files are automatically ripped into 1-bit TIFFs by GMG 1-Bit Creator.
Please note that there might be differences in the 1-Bit Creator results between GMG ColorProof and the external RIP that is later used in the plate making process. For simulating ink dot patterns in the printing process with GMG DotProof, the use of the same 1-bit TIFFs from an imagesetter RIP for proofing and for plate making is recommended for a reliable prediction of effects such as moiré.
Even if the same screen is used in GMG ColorProof, the resulting dot pattern cannot be 100 % identical to the RIP output during the plate making process, because the RIP engine and the underlying algorithms might be different.
Defining the screening parameters
Please ask the printing company for the screening that will be used for plate making, to achieve a result in the proof as close to the final output as possible.
The screening angles are predefined in the screen set, but you can change the assignment of the screening angle to the color channel in the Screen Set Parameters grid. Other parameters defined in the screen set such as the screening frequency are shown for your information, but cannot be changed.
| Group | Short description | See also |
|---|---|---|
| Screen Set | A screen set defines the screen frequency, the screening type, the dot shape, and the angle of the grid for each color channel separately. The RIP resolution is fixed and cannot be changed. |
If the final screen set that will be used for plate making is unknown, an often-used default screen set is 150 lpi, Euclidian, Cyan 75°, Magenta 15°, Yellow 0°, Black 45°. The screen angles of the separate channels should be shifted at least by 15° towards each other for avoiding moiré effects.