Graphics::drawImage() quality

you can use setRenderingHints()

eg.
http://www.java2s.com/Code/JavaAPI/java.awt/Graphics2DsetRenderingHintsMaphints.htm

may also be of interest

http://java.sun.com/products/java-media/2D/perf_graphics.html

for interpolation

http://www.java-tips.org/java-se-tips/javax.imageio/java-2d-api-enhancements-in-j2se-5.0.html

Yeah that seems to be what im looking for, but how could I store those values to use later - I want to do something like:

     Object m_ImageQuality = RenderingHints.VALUE_RENDER_BILINEAR;

     // Later on
     Graphics2D g2 = (Graphics2D)g;
     RenderingHints hints = g2.getRenderingHints();
     hints.put(RenderingHints.KEY_INTERPOLATION, m_ImageQuality);
     g2.setRenderingHints(hints);

but Im getting exceptions relating to m_ImageQuality - what type is that supposed to be?

Thanks

whats the error?

Exception getting thrown, says invalid argument for:

     hints.put()

code looks fine, that method accepts 2 Objects

http://java.sun.com/javase/6/docs/api/java/awt/RenderingHints.html#put(java.lang.Object,%20java.lang.Object)

(I assume that your m_ImageQuality definition should be:
Object m_ImageQuality = RenderingHints.VALUE_INTERPOLATION_BILINEAR;
?)

Your code works fine for me. I wonder if it's your runtime (there's no guarantee that all of the algorithms are implemented). Try this, and let us know if the exception persists:

Object m_ImageQuality = RenderingHints.VALUE_RENDER_DEFAULT ;

ah yeah im being dumb, VALUE_RENDER_DEFAULT  had nothing to do with the interpolation schemes. I guess nearest neigbor is the default.

I think BILINEAR and BICUBIC are the same in my implementation, though I haven't examind the pixels programmatically. I'm surprised how slow it is.

Thanks!