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Graphics::drawImage() quality

Posted on 2007-11-29
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Last Modified: 2008-02-01
Hi,

When i use the drawImage() function of Graphics, the output quality isn't that great. In win32, you can set some flags for interpolation type of the output image to the device context. Is there any parallel in java? I'd like to do a nicer interpolation than nearest neighbor (looks like that's what's being used)

Thanks
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Question by:DJ_AM_Juicebox
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11 Comments
 
LVL 92

Expert Comment

by:objects
ID: 20378072
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LVL 92

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by:objects
ID: 20378077
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Author Comment

by:DJ_AM_Juicebox
ID: 20378307
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
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LVL 92

Expert Comment

by:objects
ID: 20378403
whats the error?
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Author Comment

by:DJ_AM_Juicebox
ID: 20378422
Exception getting thrown, says invalid argument for:

     hints.put()
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LVL 92

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by:objects
ID: 20378489
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LVL 25

Expert Comment

by:InteractiveMind
ID: 20378541
(I assume that your m_ImageQuality definition should be:
Object m_ImageQuality = RenderingHints.VALUE_INTERPOLATION_BILINEAR;
?)
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LVL 25

Expert Comment

by:InteractiveMind
ID: 20378617
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 ;
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Accepted Solution

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InteractiveMind earned 2000 total points
ID: 20378624
(I think you'll need to use the key  KEY_RENDERING  rather than  KEY_INTERPOLATION)
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Author Comment

by:DJ_AM_Juicebox
ID: 20379089
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!
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