exportimage giving unexpected results

Melvyn Poore's icon

1. trying to learn about openGL objects, I noticed that the correlation of _blend_mode_ and _blend_ seems to be different to what is in the manual. This is confusing.
2. Whilst trying to save my work, I discovered that what gets saved is not what I see in the jit.window.

screenshot

I'm sure there's a reasonable explanation for this, but I'm not seeing it! Any tips would be very welcome! Thanks!

Matteo Marson's icon

Hey Melvyn,

1) Could you please provide examples of the wrong blend_mode/blend correlation?

2) The export looking different from the rendering window might depend on the alpha values.
Try to discard the alpha plane and substitute it with a solid 1:

Max Patch
Copy patch and select New From Clipboard in Max.

Melvyn Poore's icon

thanks for the illustration, Matteo. Here's the same patch with some remarks about the blend_mode/blend correlation. There is only one which is different to what's in the manual, but often the communication between blend and blend_mode seems to break down, which is what I originally noticed without understanding it.

test_blend_mode.maxpat
Max Patch