The exposure threshold value can be set when a bitmap image file is imported to Beam Studio.
Find the "Gradient" option on the right side of Beam Studio.
When "Gradient" is disabled, images will be transformed into monochromic, which is optimized for built-in "Monochromatic Engraving" parameters.
When "Gradient" is enabled, images will be transformed into grey-scale, which is optimized for built-in "Shading Engraving" parameters.
The "Threshold" value can be adjusted when “Gradient” is disabled.
This function is based on the RGB color model which defines colors from 1 to 255. 1 stand for black and 255 stands for white. For example, setting the threshold value to 125 will turn all colors above 125 into white.