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US 2003/0169437 A1Published application
Calibrating printing machines
OwnerMark Priestinventor
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OwnerMark Priestinventor
Estimating the term…
A method of calibrating a computer-controlled printing machine to produce printed copies of an original image to a pre-determined standard, comprises: using the printing machine to print a reproduction of a step wedge, having patches with densities concentrated in a central region of the density range, with the machine set to dot gain values corresponding to pre-determined density values on a standard dot gain profile; formulating a revised dot gain profile having the same shape as the standard dot gain profile but with a maximum dot gain which is equal to the maximum measured dot gain and which is located at the density having the maximum measured dot gain; determining revised dot gain values for the predetermined density values from the revised dot gain profile; and setting the dot gain values in the printing machine in accordance with the revised dot gain values.
A method of calibrating a computer-controlled printing machine to produce printed copies of an original image to a pre-determined standard, comprising:
A method according to any preceding Claim, comprising placing the step wedge on a portion of the print job in an area outside the image area and using the machine to produce a reproduction of the image plus step wedge.
A method according to any preceding Claim, further comprising the steps of:
A computer program adapted to perform the steps of the method according to any preceding Claim when loaded into a computer-controlled printing machine.
A calibration tool for use in calibrating a computer-controlled printing machine, which calibration tool comprises a step wedge provided with a series of colour patches having density values concentrated in a central region of the density range.
A calibration tool for use in calibrating a computer-controlled printing machine, which calibration tool comprises a step wedge provided with a series of colour patches having density values concentrated at the extremes of the density range.
Dependencies are inferred from the claim text.