1/10/2023 0 Comments Hardware monitor calibration![]() The $200 question, then, is do you need one? Image source: Wikimedia Commons Do you need a calibration device?Ī calibration device isn’t expensive compared to camera bodies and lenses, but the best can cost a couple of hundred dollars or more. The figure below shows the function of three key processes and the signal path – the colour management in the monitor, so to speak.This optical illusion demonstrates how easily deceived the eyes are. The other rear LUT contains the compensation of unwanted LCD tonal value properties. The 16 bit look-up table contains the desired target properties, such as white point and gamma, for calibration by the user. The application-specific integrated circuit (ASIC) in ColorEdge LCD monitors for colour calculation and calibration contains two correction tables (LUTs). This also ensures the exact addition of the primary colours to any colour tone you desire. In most units, EIZO links the colour assignment to a three-dimensional look-up table (3D LUT) for particularly accurate calibration. This reliable and precise rendering reduces the need for corrections and therefore shortens valuable production time. In particular for deeper colour tones, nuances in colour and image structures are preserved. Thanks to their 16 bit look-up tables, ColorEdge screens resolve image signals with an accuracy of 1/65 thousandth. The result: The colour reproduction is equal, precise and reliable across various ColorEdge screens. The average colour deviation is just 0.34 Δ. This results in a consistent colour temperature over the entire grey scale. At the factory EIZO therefore configures each ColorEdge screen and its colours and tonal value curves using 343 grid points and in each primary colour. This can be exactly determined and controlled only with the aid of specific measuring devices. How the pros do it.īrightness levels vary in relation to the image signal from module to module in LCDs and the colour mixture (addition) of red, green and blue also varies. The black value, however, must once again be increased slightly.īehind the scenes of colour management Exact tonal value curves – a how-to. EIZO therefore offers another method, namely the combination of factory calibration and on-site calibration of the grey balance. Here, several grid points from the grey scale are incorporated in the LUT control and in the profile. The ColorNavigator, however, enables on-site calibration of the grey balance. Since the tonal value curves cannot be more exact, the calibration is only varied for the white point. In principle, EIZO prefers pure factory calibration. The other LUT contains the factory calibration. Our own individual settings for white point and gamma are saved in one LUT. The corrections are mostly defined by manufacturer-specific software in the monitor's LUT The EIZO hardware calibration:ĮIZO uses its own ColorEdge monitors for hardware calibration, developed in-house for media preparation, with two LUTs, and this has its distinct advantages. As the measurement accuracy is not excellent for darker tones, the black level is increased slightly. The simple method is based solely on the use of conventional colorimeters and spectrophotometers. Here, the monitor's look-up table is controlled, which has a larger colour palette to "resolve" colours and tones. Hardware calibration is more appropriate. This often results in tonal value banding or blending and this does not need to be discussed further here. It controls the colour rendering, generally within the 8 bit look-up tables (LUTs) of graphics cards. The simplest method is software calibration, such as Apple ColorSync, Adobe Gamma Loader, Logo Loader. In principle, three methods are used in calibration. Calibration is intended to counteract this. How the pros do it.īrightness levels vary in relation to the image signal from LCD module to LCD module. Calibration – the method makes all the difference Exact tonal value curves – a how-to.
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