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Thread: Linearization Vs. Calibration

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    Junior Member esku is on a distinguished road
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    Linearization Vs. Calibration

    Does anybody know which are the differents between linearization Vs Calibration? I'm printing with a Xerox machine and I'm going to start creating paper profiles with a EFi's software however on one hand people told me, before profiling linearized the machine and other people told me, before profiling calibrate the machine....

    Any suggestion?

    Kind regards.

  2. #2
    PRC Member ColorWizard is a glorious beacon of light ColorWizard is a glorious beacon of light ColorWizard is a glorious beacon of light ColorWizard is a glorious beacon of light ColorWizard is a glorious beacon of light ColorWizard is a glorious beacon of light ColorWizard's Avatar
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    Take a look at these articles:
    • http://lists.apple.com/archives/colorsync-users/2003/Sep/msg00033.html
    • http://www.poynton.com/notes/Timo/Timo_calibrate.html
    In general, one can say that the linearization can be one of the stages of the calibration.
    Cheers,
    CW

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    PRC Member odda will become famous soon enough odda's Avatar
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    Linearization Vs. Calibration

    Quote Originally Posted by ColorWizard View Post
    Take a look at these articles:
    • http://lists.apple.com/archives/colorsync-users/2003/Sep/msg00033.html
    • http://www.poynton.com/notes/Timo/Timo_calibrate.html
    In general, one can say that the linearization can be one of the stages of the calibration.
    Linearization gets the machine into a calibratable state. Then the characterization (profile) can be created.

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    Donor tetha76 is on a distinguished road
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    The linearization is the starting point for the production of color profile.
    His goal really is to choose the maximum density for each color, with very carefully considering the amount of ink that the media is able to capture reactions without redundancy and smudges.
    Many rip have created automatic reading of the density value, but I think only the human eye can notice the defects listed above.
    Succeeding in order can lead to a better print quality and an ink saving, I think it's a critical step.

  7. #5
    PRC Member ColorWizard is a glorious beacon of light ColorWizard is a glorious beacon of light ColorWizard is a glorious beacon of light ColorWizard is a glorious beacon of light ColorWizard is a glorious beacon of light ColorWizard is a glorious beacon of light ColorWizard's Avatar
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    Quote Originally Posted by tetha76 View Post
    The linearization is the starting point for the production of color profile.
    I would say, that linearization is part of the calibration process, which precedes the printer characterization and the icc profile creation.
    Quote Originally Posted by tetha76 View Post
    His goal really is to choose the maximum density for each color...
    It seems like there is a misunderstanding of the difference between the printer calibration, linearization and ink restriction (per channel in limiting) and their goals.
    In general, the printer calibration consist of three main stages:
    1. per channel ink limiting,
    2. linearization,
    3. total ink limiting.
    Per channel ink limiting impacts on the outer gamut edges.
    There are 2 main goals for this stage:
    1. maximum color gamut,
    2. predefined colorimetric values (in case of the printer recalibration).
    The assessment of the measurement results may be based on either colorimetric or dencitometric values. I prefer to use colorimteric values.
    As you had already mentioned, during this stage of the printer calibration, it's advisable to perform the visual assessment of the results in order to avoid printing defects caused by an excessive amount of inks.

    At the next stage (linearization) gradations should be distributed evenly between the paper and the solids (100% fields). Depending on the target of the printer calibration, there are several goals of the printer linearization:
    1. colorimetric linearity,
    2. a certain value of dot gain at a given tone value (usually at 40% or 50%),
    3. a certain form of the gradation curve (in case of the printer recalibration).
    The assessment of the measurement results may be based on either colorimetric or dencitometric values.

    The last stage of the printer calibration is the total ink limiting.
    It impacts on the color gamut at deep shadows. In its turn, 2 previous stages also impacts on the results of this stage. There are rare cases when it's advisable to change per channel ink limiting and/or printer linearization in order to achieve better results without printing defects caused by an excessive amount of inks.
    The main goal for this stage is the deepest shadows without printing defects. The results should also be evaluated visually.
    Cheers,
    CW

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    Junior Member esku is on a distinguished road
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    Great info, thanks

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    Junior Member williamparker is on a distinguished road
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    Some printers like the HP large format inkjet have a calibration feature built in whereby it prints a few patches like linearizing patches, results of which are stored on the printer. Profiling software often asks for this to be performed before linearizing. But this also is linearizing. Anyone care to elaborate on this.

  10. #8
    Banned Markos is on a distinguished road
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    Linearization is a special case of calibration, in which the wanted values are equal to origin values.
    If i sent a 10% stimuli, the machine output must be 10%.

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