Transparent images

[Carnaux]

Hey, @hiukim how do images, that are mostly transparent backgrounds, work on mind-ar? On JsArtoolkit5 the background becomes black and then there are issues tracking the image on white or bright backgrounds.

[hiukim]

@Carnaux that's an interesting question. I don't have a certain answer top of my head, coz I haven't really tried that. The first step is to convert to grayscale, so depends on the pixel value of the conversion.

Is there any particular reason you want to track image with transparent background? The image will still have some solid background later anyway depends on whether you place it?

[Carnaux]

The image will still have some solid background later anyway depends on whether you place it?

Exactly that, background color independent marker, so I can use in any surface unless Mind-Ar already does that.

[akhrarovsaid]

My recommendation would then be to crop the marker such that none of the transparency is in the cropped version. Then you track the cropped version instead and use the original (uncropped) target image as you intended.

[hiukim]

I think @akhrarovsaid is right. that's also what I would do if cropping is possible.

I know there are cases where cropping is not possible. For example, your target is in circular shape, or your transparency background is in an inside area.

I think the simple answer to the original question is that the library didn't handle that. It will just turn them into a single color (maybe white or black, I'm not certain).

[Carnaux]

Yeah, that should solve and I tried that too, but in my case, most images fall back to what @hiukim said.

Depending on the tracking algorithm I think gray would be better. I'm currently using black on the NFT-Marker-Creator and that is part of the issue.

I have this proposal on JsArtoolkit5, I will test it today and maybe it can be applied to Mind-Ar too.

If you are interested I will keep you updated on the matter. Thanks, guys!