Universal Laser Systems VLS3.50 Guide de l'utilisateur télécharger pdf (Page 35)

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User Guide

User Manual

Image Density (DPI) settings will also have an eect on vector quality and vector speeds when

vectoring lines other than straight horizontal or vertical lines. For example, a circle is made up of very small

straight-line segments linked together at very small angles. If you choose a high quality setting such as

6 (1000 DPI), then these segments are as small as possible and they are high in quality. The result is

the smoothest looking circle, but it will take longer to vector engrave or cut because the focus carriage

must start and stop at the ends of each line segment. Since there are many segments, it will take longer

to process, but the quality will be the highest that the machine can produce. If using a low quality

setting such as 1 (DRAFT), these segments become longer, but there are less of them, resulting in more

at-edged looking curves that will process faster.

By running samples on scrap materials and practicing with dierent settings, you can nd a compromise

between throughput and engraving quality.

Print Direction

The default direction is Down which begins engraving at the top of the eld and nishes at the bottom.

On some materials you may get better results by starting at the bottom and engraving towards the top

of the eld (Up). This is because the engraving smoke is being drawn towards the top of the eld. On

some materials engraving Down causes the smoke or debris from the engraving to be deposited onto

the previously engraved surface, possibly damaging the engraved area. Experiment with the dierent

directions using dierent materials and choose the best method for your application.

Note: The Up direction is especially useful when engraving rubber stamps and utilizing the Back

Sweep Air Assist option.

Dithering

Dithering settings are used when printing grayscale or color bitmapped images such as TIF, JPG and

BMP formatted images. Since the laser system is essentially a black and white printer (black turns the laser

ON and white turns the laser OFF), and if you choose the correct settings, the driver will automatically

convert the grayscale or color bitmap into a 1-bit “halftoned” black and white image. This process is very

similar to how newspaper photographs, as well as laser printer photographs, are printed. For a more

detailedexplanation of the terms “grayscale,” “bitmap,” “halftone” or “dither,” please refer to the “Graphic

Software Setup” section in this manual.

Halftone

This halftone pattern generator converts grayscale bitmaps into a halftoned image based on your Image

Density choice in the driver.

Image Density Angle Shape Lines Per Inch

6 45 Degrees Round 180

5 45 Degrees Round 90

4 45 Degrees Round 60

3 45 Degrees Round 45

2 45 Degrees Round 36

Error Diusion

Unlike halftone, error diusion scatters the black pixels in a random pattern to represent shading. It

uses the quantity of black dots instead of the size of the black dots to represent the dierent shades of

gray. The pattern created will be dependent on the quality setting that you choose in the driver with the

exception that there is no chart to reference. Higher quality settings, such as 5, will produce a more

densely packed, higher dot quantity pattern, whereas a lower resolution setting, such as 2, will produce

a loosely packed, lower quantity dot pattern.

Note: Do not use Error Diusion when engraving rubber stamps, otherwise dots will appear in

the background. Choose only Halftone.

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Universal Laser Systems VLS3.50 Guide de l'utilisateur Page 35

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