if a big image in pdf, when save as image jpg, or png, will OutOfMemoryError
private static BufferedImage from8bit(PDImage pdImage, WritableRaster raster)
throws IOException
{
InputStream input = pdImage.createInputStream();
try
{
// get the raster's underlying byte buffer
byte[][] banks = ((DataBufferByte)
raster.getDataBuffer()).getBankData();
final int width = pdImage.getWidth();
final int height = pdImage.getHeight();
final int numComponents =
pdImage.getColorSpace().getNumberOfComponents();
int max = width * height; // maybe a big image (10000x5000 px) but
just 1080*1920 px can show on pdf
byte[] tempBytes = new byte[numComponents];
for (int i = 0; i < max; i++)
{
input.read(tempBytes);
for (int c = 0; c < numComponents; c++)
{
banks[c][i] = tempBytes[0+c];
}
}
// use the color space to convert the image to RGB
return pdImage.getColorSpace().toRGBImage(raster);
}
finally
{
IOUtils.closeQuietly(input);
}
}
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