Hi, Support:
Would you tell me how to reach this purpose?
That is to say:
There have 4 images, whose filename may be Back.png, 1st.png,2nd.png,3th.png, I want to overlay 1st.png on the Back.png with 0.5 transparence, …...front, alpha) ((front * alpha) + (back * (255 - alpha))) / 255...public API or adding new filter alpha(opacity) as exists in css....