Universal Laser Systems Laser Platform M-300 Anleitung zur Fehlerbehebung PDF herunterladen (Seite 88)

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8-4 Special Applications Guide

The laser system can print all three types of bitmaps providing that either the driver or the

bitmap image-processing program converts the grayscale and/or color bitmaps into a

monochrome bitmap. Essentially, the laser system is a monochromatic printer, either it fires the

beam to burn a dot or it does not fire the beam to leave an empty dot on the material.

There are several different, bitmap storage formats available: TIF, BMP, PCX, and others. We

prefer to use the TIFF format because it is most widely used format. The format makes no

difference to the laser system. The difference in formats involves how they are stored on your

computer’s hard disk. Bitmaps cannot be edited in most graphics software. Some basic

functions such as cropping, scaling, or mirroring might be possible but it is usually necessary to

use a bitmap image processing software to perform a dot by dot editing, rotation, or scaling of

the bitmap.

Monochrome Bitmaps

If you scan the image in monochrome (black and white) mode, set your scanner to at least 600

DPI. The higher the DPI, the smoother the image will be. Scanning monochrome images at

300 DPI is the minimum recommended resolution but scanning them at 600 DPI will provide a

significant improvement in the image quality. Clean it up in your bitmap image-processing

program and save it to your hard disk. You can now either print the image directly from your

bitmap image processing program, or import the bitmap into a graphics program and print it

from there. Monochrome bitmaps are engraved in the same manner as black filled text. The

black area will turn the laser on and the white area turns the laser off.

Grayscale Bitmaps

When scanning image in the grayscale mode, you should scan the image at no more than 300

DPI. Scanning at a higher DPI does not improve image quality but it consumes more memory

and will take longer to print. Grayscale images cannot be printed directly to the laser system.

Since the laser system actually works like a black and white printer, grayscale images must be

converted into a black and white images. To do this, either the driver will do it automatically or

you can convert the grayscale image to a black and white image in your bitmap image-

processing program.

The two, primary grayscale image conversion techniques are Halftone or Error Diffusion. The

printer driver can print either one and it is selected in the driver under the “Graphics” tab.

Please refer to the section on the printer driver for more details on how to set these parameters.

Since the driver has a fixed method of conversion, you may want to experiment by using your

bitmap image-processing program to make the conversion. These software programs usually

have more options for controlling the size, angle, shape, and the amount of black and white dots

(pixels) created when converting the image. Experiment with all of the controls to see which

looks the best. Big dots look good on some materials and small dots look better on others.

Once the image is converted by your program, save it and either print it directly from that

program or import it into your graphics program and print it from there. Essentially, a Halftone

image and an Error Diffusion image are actually both monochrome images and can be treated

as such. If you decide not convert the grayscale image to a monochrome image in your bitmap

image editing program, then the driver will do it automatically and will use settings based on the

Resolution settings in the driver.

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