I’m loading a TGA file and i want to use from its alpha value. As you know, in photoshop, we can select the appropriate parts of the image and then create a qucik mask.In this case, our image has two alpha values: 0 and 1. If we use from OpenGL with the following function, we can clip part of the image:
glBlendFunc( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA );
Now i need to use from an alpha value of 0.5 for part of my image. If i create a quick mask, i have two alpha values: 0 and 1. So i can not add an alpha value of 0.5. So how can i add an alpha value other than 0 and 1 to my targa(*.TGA) image?