HP DesignJet T1100mfp A0 User Manual

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1.b Most of the colors are OK but certain ones are very different 
 
Follow the steps 1 to 5 as in 1.a and proceed from there:  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2.4.2.2 Grays are wrong in a color copied image 
 
Follow steps 1 to 4 as in 1.a There is an overall color cast in section 2.4.2.1.  If the 
problem persists, try cleaning the white background plate that is on the top assembly of 
the scanner over the glass plate....

22/52   Color Reproduction for the HP Large Format Color Copier products family.  To avoid copying the background of a background-colored document (typically sepia) 
you should use the background cleaning option when scanning in color mode; if you 
are interested in B&W copying you should use either Sepia or Blueprint type of original.   
 
2.4.2.6  Vertical bands appear in the copy 
 
This normally happens when the glass plate is dirty (either because it was dirty before 
the scanning or because the...

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3. ANNEX 
 
3.1 Color reproduction: theory of operation 
 
The following is a theoretical treatment of the technology involved in the 
scanning and reproduction of images. The technology at work in your particular 
product may be slightly different from that referred to the description that 
follows. 
 
Color reproduction consists of transferring an original image that resides on a substrate 
onto another substrate (paper or...

24/52   Color Reproduction for the HP Large Format Color Copier products family.  The principle behind color reproduction is that the original and the final image relate to 
each other according to the desired reproduction intent. 
 
It is also important to underline that the process includes image enhancement. This 
feature is included so that when the original is noisy, badly contrasted or imperfect, the 
resulting output can be enhanced (smoother, better contrasted, with enhanced edges 
and lines). In...

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• According to the shadows or contrast levels: 
o two levels: only black and white (e.g. text document) 
o multilevel: many gray levels (e.g. picture) 
 
• According to the original’s conditions:
 
o Clean image 
o Damaged or noisy original: 
# Stained, marked, smudged, spotted, … 
# Scratched, torn, … 
 
It is important to know what type of original you are handling in order to use the correct 
reproduction settings....

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The scanner is the device that digitizes the original and sends it to the processor for 
further digital treatment. It consists of a light source, a paper movement mechanism, 
RGB image sensors (two or more cameras) and the electronics required to process the 
data from the sensors. 
 
 
 
 
 
 
 

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3.1.2.1 Light source 
 
The light source provides enough light along the vision strip so that, after being 
modified by the original image
2, there is sufficient reflected light to reach the image 
sensors. 
  
The light source (lamp) stabilizes after the scanner has been on for approximately one 
hour. Therefore, if the color reproduction is critical and you don’t want to see 
differences from one end of the copy to the...

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The cameras must be periodically calibrated in order to avoid undesired geometrical 
distortions in the final copy, as well as ensure a correct color capture. Calibration can 
be performed using the scanner maintenance tool provided with the system. It is 
advisable to run the scanner calibration every time the system warns the user to do so, 
or when any of the following defects appear: jagged lines, blurry images,...

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The touch screen provides the user interface to the system and connects the various 
elements of the system. 
 
The user interface is divided into three parts (see picture below):  
 
• The control section, with four main control tabs: Copy (from original to final 
output), Scan (for scanning to a file), Print (for printing from a file) and Setup 
•...

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The task of the printer is to place tiny drops of ink on the media (paper or other 
substrate) in order to form an image that corresponds to the data file received. 
 
 
 
Your HP Large Format Copier supports the printers defined in the product’s data sheet. 
 
Most of them are thermal inkjet printers, which means...