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HP Designjet 4500 Scanner - Frequently Asked Questions on Calibrations, Preset Brightness / Color Settings and Scan Resolution

Information

Some of the frequently asked questions on the Designjet 4500 Scanner are compiled here.

Details

  1. Bit depth is 24 and 8 in color scanning but what are the values in b/w scanning?
    8-bit for greytone scanning and 1-bit for basic b&w scanning. That means that if you select Photo, Map or CAD Mix, the scanner will be using 8-bit color depth, and if you select CAD Lines, Blueprint or Sepia, the scanner will be using 1-bit. These are the bit depths of the files, but the Hardware is really scanning at 48bit and then scaling down to the desired bit depth (24, 8 or 1 bit).
  2. File formats for scanning. TIFF and JPG are supported file formats but customer needs:
    • For color scanning uncompressed TIFF
    • For b/w TIFF G4 or G3
    Both are available. TIFF G4 or G3 is available only when 1-bit depth scanning mode is selected (that means B&W CAD Lines, Sepia or Blueprint). For the rest of B&W Types, you can choose either Uncompressed or Pack bits.
  3. Does the scanner support ICC profiles? For example can you create your own ICC profile and images are scanned using that profile. If you want to adjust color settings is it better to do in scanner or afterwards in some other software.
    The scanner uses its own media profiles, which are created by the user for each media type they are printing one, by using the Media profile process inside the scanning software. It is not possible to create media profiles with an external device and then import them into the scanning software. If the user has any special need regarding color profiling, they will need to scan to file and print the files from an external computer with the software and ICC profiles that they prefer.
  4. Calibration: How often it is necessary to calibrate scanner and how to calibrate colors in scanner?
    At least once a month to compensate for the light source changing characteristics (fluorescent lamp).
  5. How to calibrate Is the calibration sheet only method if colors are not accurate any more?
    No, you can calibrate towards printer using a special high accuracy calibration sheet: Print the sheet from the included software, then rescan this sheet and set up an (internal) scan->print profile for the actual media used.
  6. Comment:
    There are two different kinds of calibration. The scanner calibrates itself through the color calibration that occurs during the Scanner Maintenance process. The Media profile creation is intending to calibrate color of the output when printing to a certain printer with certain media type.
  7. If there is a white balance calibration is that enough for keeping color values?
    If your question is about Background removal, the answer is that this process is performed during printing, so if you only scan to file the background will not be removed. Colors should not change after background removal.
  8. How long does the scanner keeps its calibration after power has been switch off. So if scanner is powered off for weekend is it necessary to recalibrate on Monday?
    Correct, the calibrations are saved on disk and are permanent until you perform new calibrations. The only think to take into account is that you need to let the scanner warm during 1 hour to get accurate colors.
  9. How long does it take to calibrate the scanner?
    Built in automatic calibrations take around 25 minutes.
  10. Preset Brightness / Color Settings:Is there a preset brightness / color setting for different materials or can you fine tune brightness / colors settings and save those settings as a profile?
  11. Does the scanning software include different scanning profiles for different media, can you create your own and save it for later use?
    Yes. So each time you scan similar media you do not have to fine tune settings again.
    Yes. The user can create different media profiles (which are not associated to scanning settings, they are just a color calibration on certain media type).
  12. Is it possible to fine tune preset values, so values that are already for certain media profile.
    Media profiles are not associated to preset values, you can create a set of scanning settings and associate it always to the same media profile if you want. You can either create a new media profile from scratch or validate an existing media profile.
  13. Scan resolution:What is the maximum dpi for full width of scanning area. Brochure says 300dpi but it also mentions 508/300dpi. So if I want to scan 42" wide map what is the maximum optical resolution? Maximum enhanced resolution. Are there any limitations for max dpi for max width?
    You may scan with the max resolution; however remember the resulting file size may be huge, dependent on the size of the drawing you scan.
    300ppi is the preset resolution for the Best scanning mode. Optical resolution is 508ppi, max enhanced resolution is 2400ppi.
  14. What is the paper feeding mechanic, how many motors and how many axel/shafts paper feeding unit includes.
    One motor driving several shafts of rollers (2 roller pairs).
  15. There is 1GB ram and 30GB hard disk. Because customer is scanning thousands of small maps there is a risk that hard disk will be fragmented, how to defragment the disk?
    Yes, this is a normal PC hard disk, and may be defragmented by normal windows defrag or other 3rd party software. One other solution is to scan to a remote mounted hard disk. (this is easily done since the system is network- and PC based ).