OpenGL transparent images have black in them

Question

I am working on a game for Android and I was wondering why whenever I draw images with transparency there seems to always be some black added to the transparent parts. This

Answer 1

I figured out how to fix it.

I changed

GLES20.glBlendFunc(GLES20.GL_SRC_ALPHA, GLES20.GL_ONE_MINUS_SRC_ALPHA);

to

GLES20.glBlendFunc(GLES20.GL_ONE, GLES20.GL_ONE_MINUS_SRC_ALPHA);

It turns out that Android pre-multiplies the alpha of textures of PNG images when you load it (making white turn gray).

I added

vColor.r = vColor.r * vColor.a;
vColor.g = vColor.g * vColor.a;
vColor.b = vColor.b * vColor.a;

to my vertex shader to do the multiplying for my other colors.