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OpenGL black borderof 2 texture when scaling

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Hello i am using openg for 2d only textures.l my texture are png files. I noticed at some scale there i a small black line located at the bottom border of the png (it seems to blink). it is not a big problem but is a bit ugly. with no scale no issue. Most of the scales are ok, only some value are messing opengl. here is my code for the texture. creation: glBindTexture(GL_TEXTURE_2D, work->textureID); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST ); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_WRAP_T,GL_CLAMP_TO_EDGE); glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_WRAP_S,GL_CLAMP_TO_EDGE); glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, work->w, work->h , 0, GL_RGBA, GL_UNSIGNED_BYTE, work->data); and then during blitting there is a translate(), a scale() if new dim are not the same than original png dim, and a simple begin() end() with vertex stuff.

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