使用JAI切割TIF圖片

public void tifcut() throws FileNotFoundException, IOException {

//tif檔，存檔位置

StringBuilder tifPath = new StringBuilder();

//分割檔，存檔位置

StringBuilder savetifPath = new StringBuilder();

//如果存檔位置資料夾未建立，建立資料夾

if (!(new File(savetifPath.toString())).isDirectory()) {

(new File(savetifPath.toString())).mkdirs();

}

FileSeekableStream stream = new FileSeekableStream(tifPath.toString());

PlanarImage in = JAI.create("stream", stream);

int destWidth = in.getWidth(); //切割寬度

int destHeight = 1600 * 1024 * 8 / in.getHeight() / 2; //切割高度

int rows; //切割縱數量

//計算切片的縱向數量

if (in.getHeight() % destHeight == 0) {

rows = in.getHeight() / destHeight;

} else {

rows = (int) Math.floor(in.getHeight() / destHeight) + 1;

}

String Path = savetifPath.delete(savetifPath.length() - 4, savetifPath.length()).toString();

for (int i = 0; i < rows; i++) {

ParameterBlock pb = (new ParameterBlock());

pb.addSource(in);

if ((i + 1) * destHeight < in.getHeight()) {

pb.add(0f);//切割起始位置 x

pb.add((float) (i * destHeight));//切割起始位置 y

pb.add((float) destWidth);//切割寬度

pb.add((float) destHeight);//切割高度

} else {

pb.add(0f);

pb.add((float) (i * destHeight));

pb.add((float) destWidth);

pb.add((float) (in.getHeight() - i * destHeight));

}

String cutPath = Path + "_" + i + ".tif";

PlanarImage out = JAI.create("crop", pb, null);

OutputStream os = new FileOutputStream(cutPath);

TIFFEncodeParam param = new TIFFEncodeParam();

ImageEncoder enc = ImageCodec.createImageEncoder("tiff", os, param);

enc.encode(out);

os.close();

}

stream.close();

}