Bufferedimage to Byte[]

[anribalam]

Hi,

i've found code by google to convert bufferedimage to byte[] :

private byte[] image_byte_data(BufferedImage image)
{
    WritableRaster raster = image.getRaster();
    DataBufferByte buffer = (DataBufferByte)raster.getDataBuffer();
    return buffer.getData();
}

and another one :

BufferedImage originalImage = ImageIO.read(new File("c:\\image\\mypic.jpg"));
ByteArrayOutputStream baos = new ByteArrayOutputStream();
ImageIO.write( originalImage, "jpg", baos );
baos.flush();
byte[] imageInByte = baos.toByteArray();
baos.close();

i want to get byte[] from bufferedimage, then do some process that may make values of byte[] changes.

after that process, i'ill get new byte[] values, then i want to create new bufferedimage from that image and show it as image.
which code is fit with my problem.
and what difference between both above.

[Tolls]

The former byte[] is the actual image.
The latter byte[] is the jpg (ie compressed) image.

The former is the one you want to use for manipulating an image.

[anribalam]

thanks for reply,

when i try getting byte[] with the first code above,
i've got a huge byte[] in string.
* i write the byte[] to file text,

is it because with former code, i get raster data (contain Alpha, Red, Green, Blue color)?
one pixel will represent as block of 4 byte of color.
is it true?

actually, i want to do some encryption process that encrypt plain-image to cipher-image.
so i need convert plain-image to byte[].
but after i encrypt the byte[], i must get byte[] that can be represent as image.
is it possible right()?

Thanks in advance

[Tolls]

The former is the image data that the JVM uses to display, so it is uncompressed (as you say).
No point writing that to a file as it's not necessarily a recognised file format.

Don't know anything about creating cipher images.