HP DesignJet T830 User guide - Page 159
Variable line thickness or missing lines, Inaccurately reproduced colors
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Actions 1. Repeat the scan or copy, restarting the printer and setting the background color removal to Off or turning the original 90 degrees before scanning it again. 2. If the problem persists, clean and calibrate the scanner as indicated in Clean the scanner scanbars on page 109 and Calibrate the scanner on page 111. Then proceed to analyze pattern number B of the diagnostic plot at the intersections between scanbars. The example below shows a good result on the left and a bad result on the right: the latter has light vertical banding 0.5 cm wide at the intersection between two scanbars. If you see the kind of result shown on the right, call HP support and report "vertical light bands in area fills at the intersection between scanbars, after calibrating the scanner". Variable line thickness or missing lines When scanning some CAD plots at low resolution, mostly when working with grayscale or black-and-white prints that contain very thin lines, you may see a variation in line thickness, or even some missing lines, in some places: Actions 1. Repeat the scan or copy using a higher resolution (600 dpi). You should also set Background color removal to Off, or, for copying, set Content type to Mixed. You might also deactivate the automatic de-skew as explained in A copied or scanned image is very skewed on page 164. In case you were working in blackand-white mode, we recommend using grayscale instead. 2. If the problem persists, turn the original plot 90 degrees before scanning it again. 3. If the problem persists, clean and calibrate the scanner as indicated in Clean the scanner scanbars on page 109 and Calibrate the scanner on page 111. 4. If the problem persists, see Defocus, blurring and fading colors on page 159. Inaccurately reproduced colors You have to deal with several variables if you want perfect color matching between the original you are scanning and the copy or scanned file you obtain as a result. If you find undesired colors in cases like the example shown below (original on the left, scanned image on the right), you can follow these guidelines. ENWW Variable line thickness or missing lines 155