java – 在Batik中使用SVGConverter将svg转换为png时的图像质量很差
作者:互联网
我转换后的图像质量非常低.我尝试过使用setQuality方法,但它似乎没有改变任何东西.
这是将svg转换为png的代码的一部分:
SVGConverter svgConverter = new SVGConverter();
String[] sources = { "C:/imageData.svg" };
svgConverter.setSources(sources);
svgConverter.setDestinationType(DestinationType.PNG);
svgConverter.setDst(new File("C:/image.png"));
有谁知道如何才能让图像质量更好?
解决方法:
我在将SVG转换为PNG(使用字节数组)时使用此代码:
private byte[] renderPng(byte[] svgBytes) {
try {
TranscoderInput transcoderInput = new TranscoderInput(new ByteArrayInputStream(svgBytes));
ByteArrayOutputStream output = new ByteArrayOutputStream();
TranscoderOutput transcoderOutput = new TranscoderOutput(output);
Transcoder transcoder = null;
String type = "png";
if(type.equalsIgnoreCase("png")) {
transcoder = new PNGTranscoder()
{
@Override
protected ImageRenderer createRenderer()
{
ImageRenderer r = super.createRenderer();
RenderingHints rh = r.getRenderingHints();
rh.add(new RenderingHints(RenderingHints.KEY_ALPHA_INTERPOLATION,
RenderingHints.VALUE_ALPHA_INTERPOLATION_QUALITY));
rh.add(new RenderingHints(RenderingHints.KEY_INTERPOLATION,
RenderingHints.VALUE_INTERPOLATION_BICUBIC));
rh.add(new RenderingHints(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON));
rh.add(new RenderingHints(RenderingHints.KEY_COLOR_RENDERING,
RenderingHints.VALUE_COLOR_RENDER_QUALITY));
rh.add(new RenderingHints(RenderingHints.KEY_DITHERING,
RenderingHints.VALUE_DITHER_DISABLE));
rh.add(new RenderingHints(RenderingHints.KEY_RENDERING,
RenderingHints.VALUE_RENDER_QUALITY));
rh.add(new RenderingHints(RenderingHints.KEY_STROKE_CONTROL,
RenderingHints.VALUE_STROKE_PURE));
rh.add(new RenderingHints(RenderingHints.KEY_FRACTIONALMETRICS,
RenderingHints.VALUE_FRACTIONALMETRICS_ON));
rh.add(new RenderingHints(RenderingHints.KEY_TEXT_ANTIALIASING,
RenderingHints.VALUE_TEXT_ANTIALIAS_OFF));
r.setRenderingHints(rh);
return r;
}
};
transcoder.addTranscodingHint(PNGTranscoder.KEY_BACKGROUND_COLOR, Color.WHITE);
} else {
transcoder = new JPEGTranscoder();
Float jpegQuality = new Float(0.95);
// KEY_WIDTH - seems to pick it up just fine from the SVG charts. Set to 560 otherwise.
// KEY_QUALITY 0-1.0 with 1.0 being No Loss. Value must be of type Float. 0.95 is 30% smaller and looks great.
transcoder.addTranscodingHint(JPEGTranscoder.KEY_QUALITY, jpegQuality);
}
// NOTE: for linux you need Java 1.4.1+ AND the headless environment (e.g. export JAVA_OPTS='-Djava.awt.headless=true').
try {
transcoder.transcode(transcoderInput, transcoderOutput);
}
catch(Exception e) {
logger.error("SVG To Raster response transcode exception", e);
if(output != null) {
output.close();
}
throw( new RuntimeException("SVG To Raster Filter Response Stream Exception", e) );
}
if(output != null) {
output.flush();
output.close();
}
transcoderInput = null;
transcoderOutput = null;
transcoder = null;
return output.toByteArray();
} catch (Exception exc) {
logger.error("Error in rendering png method", exc);
}
return new byte[0];
}
此外,SVG文档中的clipPath元素应包含此属性,否则将具有奇怪的工件:
<clipPath shape-rendering="geometricPrecision" ... >
标签:java,batik 来源: https://codeday.me/bug/20190530/1182671.html