Andengine gles2 - weird JPG look

Question

I want load backgound texture from JPG, scale it down to proper size. So I have 1920x1080 picture and I scale it to ~800x480.

BitmapTextureAtlas splashTextureAtlas = new BitmapTextureAtlas(this.getTextureManager(), 1920, 1080, TextureOptions.DEFAULT);
        splashTextureRegion = BitmapTextureAtlasTextureRegionFactory.createFromAsset(splashTextureAtlas, this, "new/splash_bg1.JPG", 0, 0);
        splashTextureAtlas.load();

Sprite splash = new Sprite(0, 0, splashTextureRegion, mEngine.getVertexBufferObjectManager());
        splash.setScale(mainScaleX);

And effect is poor.

Orginal File

What I see on screen

I try with diffrent TextureOption but without any effect. Could you suggest me what I'm doing wrong?

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UPDATE

Even when I keep aspect ratio quality is poor

Answer 1

By default, dither is disabled for performance reasons. For gradient textures that are experiencing really bad banding, try adding this to your sprite creation:

Sprite splash = new Sprite(0, 0, splashTextureRegion, mEngine.getVertexBufferObjectManager()) {

    protected void preDraw(GLState pGLState, Camera pCamera) {
        super.preDraw(pGlState, pCamera);
        pGlState.enableDither();
    }

};

Answer 2

the problem may be in your scaling - at 1920x1080 you have an aspect ratio of 1.777 - but at 800x480, the aspect ratio is 1.667.

Try scaling the image to 800x450 or 853x480 to preserve the aspect ratio of 1.777 - if you truly need 800x480, then crop the image to those specs after you scale the size down.