RetroTINK-4K Profiles Instructions

 

Custom shadow masks are stored as 32-bit RGB BMP files (yes, it MUST be 32-bit, not 24-bit). If you are using Photoshop, this should be one of the options in the save dialog. The maximum size of a shadow mask is 16 x 16 pixels.

 

The shadow mask image represents a gain factor that is applied to the output image. Mask pixels with the value 128 do not alter the underly image while value 0 performs a complete mask and value 255 performs a gain of 2x.

 

output_pixel <= (mask_value/128)*input_pixel

 

The RT4K mask engine supports full RGB operations and treats each color channel separately, allowing for complex shadowmasks or aperture grilles that closely mimic a real CRT.