Screen Proofing and Color Management Operations

When you want to do color management on the screen, you must pay attention to the following points. It is most important to determine the Luminance of Monitor, set the white point of Monitor, set the tone reproduction curve of Monitor, and set the black color of Monitor.

â—† Clean the screen surface

â—† Warm up for 30 minutes

â—† Ambient light illumination weakens

â—† Determine Luminance for Monitor (foot-lamberts or cd/m2)

â—† Set Monitor White Point (Kevlvins)

â—† Set the tone reproduction curve of Monitor (Gamma)

â—† Set Monitor black (foot-lamberts or cd/m2)

When doing the screen proofing, what is the brightness of the screen, and what is the Luminance, the specification of sRGB is 80 cd/m2, such as 80 cd/m2 will be a little darker, according to the environment, try out Increased to 85 cd/m2 to 95 cd/m2. If it is a LCD screen, you may want to adjust it more brightly. Again, the decision to white point is actually the color temperature and the characteristic curve of Gamma. Finally set Moniter's black, black is in the dark part of the hierarchy. When toning, black must be turned on and lit black so that it can be displayed on the dark side. However, if the LCD screen is darkened, it cannot be done because the light of the LCD screen is always lit. However, if the black lighter tone is more unlikely, because the LCD screen does not represent the intensity of light with the intensity of light as the CRT screen, the two are not the same.

â—† The first C of the color management (Calibration correction)

When the brightness (brightnee) and contrast (contrast) settings are made, the adjustment of the brightness is actually adjusted to black, so the black can be adjusted to black to show the black level. If the brightness is 50% in the middle, adjusting the contrast is to adjust the intensity of white, that is, white brightness, intensity can be adjusted, so when you adjust the contrast you can strengthen the intensity. When measuring 80 cd/m2, it is actually adjusting the contrast. The contrast can not be adjusted to the required illuminance. If the situation is poor, the screen may change. Adjusting the display's gain control makes the RGB three colors equal, and the brightness is adjusted within the range of 85-95 cd/m2, and the error value is adjusted to be less than 0.5 and can be completed. In addition, the coordinates will be displayed. The general setting is the color temperature of 6500. Here is the coordinates of it. So it is possible to measure RGB three colors, and then RGB is to do a standard distribution, which will be made of RGB three colors. The standard white, what we want is a coordinate axis.

â—† The second C (characterization characterization) of color management

Adjustment contrast (white on screen), brightness adjustment (black on screen), setting of monitor type: CRTorLCD, setting of Gamma=2.2 (PC, sRGB), setting of Gamma=1.8 (MAC), setting of standard color temperature 6500k ( sRGB). When adjusting Gamma's replication curve is set to 2.2 used by the PC or 1.8 used by the MAC, assuming compliance with RGB standards, the MAC will be adjusted to 2.2, may not be applicable; because APPLE was originally developed to go to proofread black and white Laser printers, so the copy curve is 1.8, so he also adjusted the screen to 1.8, but now both black and white have used color laser printers, so it is recommended that the MAC Gamma is also adjusted to 2.2. After the above settings, the ICC can be generated. The Gamma's convergence means that RGB is 0 to 255, and the Spyder is divided into nine tones. The RGB color curve is modified to a standard gray, for example, the Gamma value is 2.2. To correct Gamma's characteristics at every 30th coordinate, to make a Gamma's characteristic curve, put the screen on each RGB point and trim it to a Gamma curve. After the correction, there are 3 kinds of RGB respectively. With different curves, you can generate an ICC profile.

In LCD, LCD does not have a Gamma feature, so it needs to be simulated, because its lamp is always lit, so the characteristics of Gamma is determined by the light intensity; it is necessary to use liquid crystal polarization to simulate LCDD's Gamma color characteristics. So the time spent on the gamma color characteristics of the LCD is longer than the CRT. The reason is that the CRT measures nine gray-scale curves, but on the LCD it measures nine curves of three RGB colors. Therefore, the measured data will be a little more.

â—† The third C of the color management (Conversion color conversion)

Color conversion refers to the comparison of color gamuts. If you compare the color gamut of Adobe 1998 with the color gamut of the Viewsonic G90f screen, there is no way to completely cover the color gamut of Adobe 1998. Secondly, the accuracy of the color on the screen is worse than that of a printer, and it is a light, and when comparing with a physical object, the error is often caused by the conditional color. In a general CRT, it is usually calibrated once a week and calibrated at least once a month. The LCD is usually calibrated once a week, but because LCDs use dyes (dye to display color, longer life than CRTs, it can take longer to calibrate.