CaptureToBitmap() antialising with transparent background wrong

Scripting
1

Dear @jeff,

please can you create a bug-track for CaptureToBitmap().
(tested in Rhino 8 SR 21, and Rhino 9.0.25182.12305, 2025-07-01)

When I create a bitmap with transparent background, the antialiased pixels get a color change to black. Here a png from Rhino and Inkscape:

Antialiasing_Rhino_black
Antialiasing_Rhino_black448×446 1.3 KB

Antialiasing_Inkscape_correct_with_no_color_change
Antialiasing_Inkscape_correct_with_no_color_change443×449 2.69 KB

Here all project files: wrong_antialiasing.zip (788.2 KB)

Thank you

Michael

2

@Michael_Meyer - was Rhino 9 running in OpenGL or Direct3d display?

– Dale

3

Hi @dale,

I’ve tested now OpenGL and Direct3D in Rhino 9, no difference, I get the black border.

OpenGL_or_Direct3D_no_difference
OpenGL_or_Direct3D_no_difference2678×1248 419 KB

Thanks

Michael

4

I think I see what the problem is… I’ll get this fixed in both V8 and V9.

RH-88256

Thanks,
-Jeff

3 Likes
5

Too close to the RC release date… so this is going to have to go into the 8.x branch… Which means 8.22 is where you’ll see the fix… The next V9 WIP will have it in there though.

Thanks,
-Jeff

1 Like
6

RH-88256 is fixed in Rhino 8 Service Release 22 Release Candidate

1 Like