Brother GTX pro, Instruction Manual, Page: 76 / 356

76
Creating print data
Replace RGB=255 in bitmap image data with RGB=254
RGB=255 is identified as a transparent color. In a portion where RGB=255 is contained, no ink will be ejected.
In order for the white ink to be printed, select an area for RGB=255, and replace it with RGB=254.
To make such replacement, use the method mentioned below.
(1) In the menu bar, select [Effects] > [Adjust] > [Replace Colors].
(2) From the [Old color] pull-down menu, set RGB=255 in [Replace Colors].