TIFF/TGA/PNG/ETC textures with alpha channels not working properly

[Gilgamesh]

Hello,

I have the same issue, with different renderers using alpha map and assigning alpha channel as RGB output works fine, however you have to use a black and white image (not supposed to be 8bit) in Corona version Alpha 0.7. I am no good at programming but is it possible that this might be a 32bit image issue, while a RGB image is 24 bit, an image with Alpha is 32 Bit.  I'll try gray scale image with a different Alpha and will inform you.

[z8er]

I'm also having this problem. Anybody find a fix besides the camera output for this?

[borisquezadaa]

If i recall correctly, there was a thread somewhere about alpha on images (for opacity in trees and vegetation). That was very comprensive about.
http://forum.corona-renderer.com/index.php/topic,4249.msg29954.html#msg29954

Maybe there is something you can use to start digging.

[borisquezadaa]

I manged to get it working doing this.

The gamma value i put it there i got it out of my ass i dont have a clue of the exactly number to counter gamma of alpha channel out of photoshop. Maybe counter a double 2.2 gamma (4.84)?... perhaps. Open to discussion.

I created  a targa image with alpha channel in photoshop. As usual the opacity channel gets messed up so i put a color correct node between to alter gamma in alpha channel. It kin of work so i asume is gamma related.

[Ludvik Koutny]

I've identified the cause of this problem and logged it into mantis https://corona-renderer.com/bugs/view.php?id=1051

Moving to resolved to archive the thread.