I have a number of 10k x 6.5k pictures in a file, which granted is quite large but they’re high resolution scans of blueprints. They look nice using the regular object transparency slider, however using the color mask with the tolerance slider reduces their resolution to a fraction, making them a pixellated, unusable mess. Why is that?
Also, in Rhino 8 it took me a while to figure out why I couldn’t use the transparency slider:
I took them into Affinity Photo and made proper transparent PNGs from them instead, and that got picked up automatically by Rhino at full resolution, looking much better in the progress. I guess the transparency slider is a crude fallback (with some built-in resolution cap).
Btw, this is the second McNeel employee who has replied to me today. Don’t you guys take weekends?
I’m experiencing the same issue. When working with simple 1-bit bitmap images, I can’t achieve clean transparency, the resolution drops significantly. This isn’t just a display issue—when exporting to PDF, the resolution is also not preserved.
The original .bmp file contains only pure black and white pixels—no shades of grey. Since it’s a true 1-bit image, it should be straightforward to use it as a mask by selecting one color (e.g., white) as transparent.
I’ve attached a file that includes both the original 1-bit .bmp and a test using a greyscale .jpg version created from it.
