Generating jpeg progressive with ImageIO
30/07/2009 
Here's an example of how to generate progressive Jpeg with the ImageIO api:
ImageWriteParam writer.getDefaultWriteParam param = ();
param.setCompressionMode (ImageWriteParam.MODE_EXPLICIT);
param.setCompressionQuality (quality);
param.setProgressiveMode (ImageWriteParam.MODE_DEFAULT);
ImageWriter writer = (ImageWriter) ImageIO.getImageWritersByFormatName ('JPEG'). Next ();
writer.setOutput (ImageIO.createImageOutputStream (out));
writer.write (null, new IIOImage (image, null, null), param);
For those who do not know what a progressive jpeg, read a more technical explanation and accurate:
http://www.faqs.org/faqs/jpeg-faq/part1/section-11.html
To laymen, we can summarize:
'Is that' efeitinho'?|?| that causes the image is loaded every initially 'unfocused' and then you will gain clarity, "this is a rough explanation well, actually there is no effect, what happens is the browser receives information differently when it encounters a progressive jpeg to load, this jpeg to be written in a different way, there's nothing Javascript or css can do (perhaps with swf animated gif ... ..) but alas already lost the focus (jpeg).
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