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A few things to know about plotting Raster Images from MicroStation V7.
Printing on your system printer…some considerations: In order to reduce the amount of time it may take to spool the drawing to the system printer, and to keep the file size to a minimum, create a print file (filename.prn) and copy it to the printer. Specific steps for Windows NT are as follows: To set up printer and port:
IMAGE PLOTTING from MicroStation when using Raster Reference Files: When plotting raster images, use the HPGLRTL.plt for best results. PostScript drivers (PS650C.plt, PSC650C.plt, PSCRIPT.plt, PSCRIPTC.plt) also give quality image output, but can create large plot files. These files are not limited to just image plotting, as they will plot vector data with high quality also. HPGL2 drivers (HPDJET.plt and HP650C.plt) plot vector data very well, but images plotted with the HPGL2 drivers will be grainy and may result in large plot files. HPLJET4V.plt and HPPCL5.plt will produce quality image output. Note: Images will not plot correctly with any driver unless the hardware_raster/resolution=300 line in the .plt file is un-commented. This is done by removing the semi-colon (;) at the beginning of the line. The wording of this line may vary slightly in some files (i.e. software_raster/resolution=32).
IMAGE PLOTTING from Image Manager or DESCARTES: MicroStations Image Manager supports PostScript and HPGL2/RTL devices, as well as all raster devices supported through the Windows Print Manager. The Image Manager will allow you plot to the following devices:
Sample Plot Drivers
Plot Device
Plot Lanugage
Concatenated Plot Driver (.plt)
HP650C
RTL
imrtl / dcrtl
pscript
postscript
imps / dcps
pscriptc
postscript colour
impsc / dcpsc
printer
PC Printer
imgen / dcgen
Settings in the various plotting dialog boxes let you control the output to the respective plotters, or printers. (File > Print/Plot > Setup > Device)
Plot Raster Images This parameter, which is saved with the project, enables or disables the plotting of raster images. It’s ‘on’ by default. Gray Scale RTL - Turn on to use Gray Scale to plot images in gray scale RTL format even if they are color images. If you wish to print color images, and your RTL device supports color, leave Gray Scale turned OFF. PostScript - If Gray Scale is ON, images are plotted with a half-toning technique that renders shades of gray. Leave it turned OFF to plot images in color PostScript format. For both RTL and PostScript devices, the following also applies: When plotting to a black and white RTL or PostScript device, you should turn on Gray Scale, even for color images. This saves time and minimizes the disk space required to plot the image. Color mosaics of multiple images can be printed correctly even though they may not display correctly on your monitor. This can occur because each image in a view is plotted to a color PostScript device using its own color table, like with a 24 bit display. (If you have an 8 bit display and one image is active, all images use its color table for on-screen display. The ON/OFF status of the Gray Scale option does not affect the design files. Therefore, you can print color design elements in a color PostScript format even if the Gray Scale check button is ON (to plot the images in gray scale). Use Fence Used to indicate whether the raster images should be clipped to the fence when plotting the view. The Use Fence option is only available when a fence is active. Contrast and Brightness Settings Used to set the contrast and the brightness of images in your plots. These settings apply only to images when plotting. They do not affect the on-screen display of images. Output Resolution It is recommended that you select the maximum possible number of pixels per inch for the output resolution. You can use a lower resolution to obtain a quick draft output but the higher resolution should be used to obtain high quality output. To ensure maximum quality for your plot, you should set this value to the same resolution as that of your printing/plotting device. With devices that use half-toning, however, the maximum resolution that you can achieve is the net resolution after half-toning (that is, the net resolution will be less that the overall resolution of the device). Since a value set higher than necessary usually does not provide added resolution, it is advisable to determine the optimum value to minimize the size of your plot file. To calculate the output resolution that will produce the smallest plot file size: