I'm trying to save a BufferedImage (came from byte[]) to a File, but it's producing a black background without the image. I'm using the photoCam from primefaces.
This is my ManagedBean method:
public void webcamCapture(CaptureEvent captureEvent) {
try {
byte[] data = captureEvent.getData();
InputStream in = new ByteArrayInputStream(data);
BufferedImage fotoBuffered = ImageIO.read(in);
String idImagem = ImagemHelper.getInstance().salvarImagemFromImageObject(fotoBuffered);
paciente.getPessoaFisica().setFoto(idImagem);
} catch (Exception e) {
addErrorMessage("Erro ao capturar imagem da webcam");
FacesContext.getCurrentInstance().validationFailed();
}
}
The method "salvarImagemFromImageObject" simple make a "ImageIO.write(image,"jpg",destFile)" to save a file, but this file don't have nothing, just a black background.
Primefaces PhotoCam component renders PNG images. PNG format is by design. If you want to work with another file format, you'll need to post-process the PNG image rendered by the PF component.
Refactor your salvarImagemFromImageObject function with a .png
destFile:
ImageIO.write(fotoBuffered, "png", destFile);
EDIT
Writes the resulting png data to jpeg format:
//Converts PNG image to plain RGB format
BufferedImage newBufferedImage = new BufferedImage(fotoBuffered.getWidth(), fotoBuffered.getHeight(), BufferedImage.TYPE_INT_RGB);
newBufferedImage.createGraphics().drawImage(fotoBuffered , 0, 0, Color.WHITE, null);
//Then, writes to jpeg file
ImageIO.write(newBufferedImage, "jpg", destFile);
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