Discard alpha channel

[ghsanti]

I do not see a way to load an image and remove or discard the alpha channel from loaded images. This is useful for Deep Learning models that do not normally train using alpha.

I tried

  const buffer = await image.rgba(false).getBufferAsync(Jimp.MIME_JPEG)

but does not seem to be how you use it.
Is there any implemented or simple way to do this?

[da7a90-backup]

Given a buffer of an image one way I managed to do it is:

  const flattened = await Jimp.read(buffer);

  flattened.colorType(2);

  flattened.background(0xffffffff);

the documentation doesn't really mention flattening and vaguely touches on alpha manipulation.

[da7a90-backup]

note that colorType(2) is for truecolor and colorType(0) is for grayscale and with flattened.background(0xffffffff); I set the default color of the bg pixels to white

[hipstersmoothie]

those are great options @da7a90-backup