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Calibration IV - Management Drange IIa

2 nd case: the draw has a gray scale with pure white is not at 0% and 100% is well established
This case we offers 3 solutions

1. Change the color.
   For if this is pure white before the 0% is that the color you chose too blocks UV. A simple way is to measure the first white area on our colorful range in our software image processing. We then use this color as the color range, it will therefore instead of 0% without changing that of 100%. It will print a new slide and then contact him and we will find ourselves in case No. 1.
   
   In this example we obtain the 0% to 15%. Reading the news gives us the following RGB color: 20-161-46. It replaces our starting color TSL :130-100-60 by the new color.
   
   
2. Edit
   curve can be applied to our image a curve starting at 15% to go to 100%. Note that I speak here of a curve applied to a positive file grayscale.
   
3. Modify Levels
   
   As in the first case it is also possible to change levels. This time instead of changing the gamma we will change the density of pure white, changing the output level. It was not until the appendices to find the tables of conversions. But for my example I reduce the level to 218 equivalent of 15%