Why did a square appear when printing?

Question

Seal

I did the layout in InDesign, there were transparent layers and shadows. How can this be fixed?

Answer 1

Wrote a printer driver. When printing png with transparency, I caught a black square.
I added a primary fill with white to the canvas on which I'm rendering ( try to put a completely filled with white at the bottom of the stack of layers
).
corrected the formula for converting to grayscale, taking into account alpha ( probably not taken into account in the printer driver ).
since the toner or burn dot can only be white or black,
one of two approaches is used.
lasers have a high dpi, so the dots are drawn in a matrix (4 by 4 - 16 shades, 8 by 8 - 256)
the second approach is called dithering - when the dots are distributed over the picture, the denser the more
black is needed. (as photographs were printed in newspapers)
In color printing, each color channel is rasterized separately. Check the color spaces of your layout and printer. Maybe you have rgb and your printer has cmyk .