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Java Forum / General / February 2006convert BufferedImage to a byte array
I want to get the bytes from a BufferedImage to send it over the line, how can I achieve that? I seems to be trickier than I thought. cyberco schrieb: > I want to get the bytes from a BufferedImage to send it over the line, > how can I achieve that? I seems to be trickier than I thought. See ImageIO >I want to get the bytes from a BufferedImage to send it over the line, >how can I achieve that? I seems to be trickier than I thought. you can't serialise it. The actual form is platform dependent, so it might not mean anything when you got to the other end. What you want to do is extract an array of ints or shorts or bytes and send that by serialisation or DataOutputStream.  SignatureCanadian Mind Products, Roedy Green. http://mindprod.com Java custom programming, consulting and coaching. On Sun, 12 Feb 2006 16:36:20 GMT, Roedy Green <my_email_is_posted_on_my_website@munged.invalid> wrote, quoted or indirectly quoted someone who said : >>I want to get the bytes from a BufferedImage to send it over the line, >>how can I achieve that? I seems to be trickier than I thought. [quoted text clipped - 3 lines] >to do is extract an array of ints or shorts or bytes and send that by >serialisation or DataOutputStream. you can convert it to png or jpg format and send that. SignatureCanadian Mind Products, Roedy Green. http://mindprod.com Java custom programming, consulting and coaching. Yes, getting the bytes is what I'm trying to do. Unfortunately ImageIO does not have any convenience methods for that purpose. Any other suggestions? cyberco schrieb: > Yes, getting the bytes is what I'm trying to do. Roedy pointed out why BufferedImage itself isn't serializable. You could access the matrices and send that data over the line, but you will most likely need some meta data for different color models etc. and will reinvent the wheel, because there are already dozens of image file formats available through ImageIO. > Unfortunately ImageIO does not have any convenience methods for that > purpose. What could be more convenient than: ImageIO.write(RenderedImage im, String formatName, OutputStream output); ? Timo Oops! Sorry, Timo, you're right. My bad. I overlook ImageIO.write(). I succeeded getting the byte[] in the following way. #################### ByteArrayOutputStream baos = new ByteArrayOutputStream(); ImageIO.write(bufImage, formatName, baos); byte[] bytesOut = baos.toByteArray(); >Yes, getting the bytes is what I'm trying to do. Unfortunately ImageIO >does not have any convenience methods for that purpose. Any other >suggestions? It can write to an OutputStream. Make that a ByteArrayOutputStream. see http://mindprod.com/jgloss/imageio.html#TOBYTES for how. SignatureCanadian Mind Products, Roedy Green. http://mindprod.com Java custom programming, consulting and coaching. Excellent examples, Roedy! Thanks for the link! You can serialize ImageIcon after making an ImageIcon from BufferedImage. Opalinski opalpa@gmail.com http://www.geocities.com/opalpaweb/ cyberco schrieb: > I want to get the bytes from a BufferedImage to send it over the line, > how can I achieve that? I seems to be trickier than I thought. If you know the type of the data buffer of the BufferedImage its easy: int[] t = ((DataBufferInt)(myBufferedImage).getRaster().getDataBuffer()).getData(); with DataBufferByte it works the same. Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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