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Graphics SDK Text Blending issue with DM8168

Hi,

We are using a DM8168 based custom board, and running EZSDK, and we are using Graphics SDK 4_04_00_02 for Graphics objects generation. 

With the help of examples and training courses provided in the Graphics SDK, we are able to make custom fonts and objects. But we are facing an issue with custom font. When we blend the text with camera video, blending is not perfect. There is some abnormalities foe some characters like T, Q etc. I have attached a screenshot of that: 

And, the Edges of the letters are showing a black color, which we didnt chose. What to do ? IF we are placing any other objects over the same text, the blending is almost perfect as shown below picture: 

The edges of the letters B,l,e,n is clearly blended to the video when some other OpenGL object is placed. and in other all places, edges of the letters are not correct. How to resolve this issue ?