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  • Change opacity in paint image?


    Before
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    Right now I'm drawing my paint with the (deprecated) onPaint function, and I have this code right here:

    @Override
        public void onPaint(Graphics2D g)
        {
            g.setColor(Color.WHITE);
            g.drawImage(mainPaint, 0, 0, null);
            ...
    
    

     and my "mainPaint" is just an image I'm loading through. However, the image itself is opaque.. Is there anyway (through code) I can reduce the opacity of the image?

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    AlphaComposite ac = AlphaComposite.getInstance(AlphaComposite.SRC_OVER, 0.50f); // 50% opacity

    @Override
    public void onPaint(Graphics2D g){
    g.setComposite(ac);
    g.setColor(Color.WHITE);
    g.drawImage(mainPaint, 0, 0, null);
    }

     

    Edited by Neffarion
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    AlphaComposite ac = AlphaComposite.getInstance(AlphaComposite.SRC_OVER, 0.50f); // 50% opacity
    
    @Override
    public void onPaint(Graphics2D g){
        g.setComposite(ac);
        g.setColor(Color.WHITE);
        g.drawImage(mainPaint, 0, 0, null);
    }
    

    Wait does that just like.. make it less opaque? Will try.

     

    edit: Works a charm

    Edited by Before
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    The Color constructor relevant to this is (float r, float g, float B) and (float r, float g, float b, float alpha).

     

    You would use the second one I mentioned above in a range from 0.0-1.0 for each value. For example, if you want a black, 30% opacity background for your UI:

    // Assume 'g' is passed in as an instance of Graphics2D or Graphics
    Color myColor = new Color(0f, 0f, 0f, .3f); // R, G, B, Alpha - The last value, .3f, is opacity.
    g.setColor(myColor);
    g.fillRect(x, y, width, height);
    
    
    

    The solutions that the others have provided above may work but are not a 'standard' way of doing it, considering they require Graphics2D, but it honestly does not matter. Graphics and Graphics2D are the user's preference.

     

    You can set the opacity from 0% to 100% on a scale from 0.0f-1.0f with the method I have shown in this post.

    Edited by ArmyofDragons
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    The Color constructor relevant to this is (float r, float g, float B) and (float r, float g, float b, float alpha).

     

    You would use the second one I mentioned above in a range from 0.0-1.0 for each value. For example, if you want a black, 30% opacity background for your UI:

    // Assume 'g' is passed in as an instance of Graphics2D or Graphics
    Color myColor = new Color(0f, 0f, 0f, .3f); // R, G, B, Alpha - The last value, .3f, is opacity.
    g.setColor(myColor);
    g.fillRect(x, y, width, height);
    
    
    

    The solutions that the others have provided above may work but are not a 'standard' way of doing it, considering they require Graphics2D, but it honestly does not matter. Graphics and Graphics2D are the user's preference.

     

    You can set the opacity from 0% to 100% on a scale from 0.0f-1.0f with the method I have shown in this post.

    The difference is that your approach wont work when you draw an image

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