Entities (Objects) > Bitmap > Improved Bitmap Mode > Gray Advanced > Example Gray

After marking the first bitmap, the contrast (Black Level and White Level) has to be adjusted.

Black Level Adjustment:

Find a good Black Level (laser time per area) by adjusting the Mark Speed and the Dither Step.

Picture
Black Level Effect	Not dark enough	Good dark value	Too dark
Laser time per area [ms/mm²]	6.25	10.0	12.5
Mark Speed [mm/s]	4000	3161	2828
Distance between dots [mm] [*]	0.04	0.03161	0.02828
Dither Step [mm]	0.04	0.03161	0.02828
Solution	Increase the Laser time per area to 160%, by decreasing the Mark Speed and the Dither Step to 79% of the current values.	-	Decrease the Laser time per area to 80%, by increasing the Mark Speed and the Dither Step to 112% of the current values.

Table 28: Optimize Black Level by adjusting Mark Speed and Dither Step

[*]: Frequency = 100 kHz

White Level Adjustment:

Find a good trade-off between being able to distinguish between different bright areas and the invisibility of pure white by adjusting the "Out" bit value corresponding to "In 255" bit (white) of the System PixelMap.

Picture
White Level Effect	Pure white is invisible, but different bright areas are indistinguishable.	A good trade-off between being able to distinguish of different bright areas and pure white invisibility.	Different bright areas are distinguishable, but pure white is too dark.
PixelMap white value [bit]	255	200	150

Table 29: Optimize White Level by adjusting Out bit value corresponding to "In 255" bit (white) of the System PixelMap