Re: Correcting error of write Image to file

From:

bH <bherbst65@hotmail.com>

Newsgroups:

comp.lang.java.help

Date:

Tue, 13 Apr 2010 12:27:58 -0700 (PDT)

Message-ID:

<748fc0af-f43f-429b-8141-48f92a653641@r18g2000yqd.googlegroups.com>

On Apr 12, 12:49 am, "John B. Matthews" <nos...@nospam.invalid> wrote:

In article
<d44e84ed-f362-42b1-b743-bf9af2103...@i37g2000yqn.googlegroups.com>,

bH <bherbs...@hotmail.com> wrote:

Correcting error of write Image to file

Hi All,
I want to correct an error of ImageIO.write(...

1 error found:
File: C:\Documents and
Settings\bH\Desktop\OpaqueToTransparent.java [line: 39]
Error: C:\Documents and Settings\bH\Desktop\OpaqueToTransparent.
java:39: cannot find symbol
symbol : method write(java.awt.Image,java.lang.String,java.
io.File)
location: class javax.imageio.ImageIO

//fromhttp://www.rgagnon.com/javadetails/java-0265.html
//fromhttp://www.exampledepot.com/egs/javax.imageio/

[...]

public class OpaqueToTransparent extends JFrame {
...
// Use a label to display the image
JFrame frame = new JFrame();

If you extend JFrame, you don't need to create another one.

try {
    File file = new File("images/cosmobX.gif");
      //error on the next line
      ImageIO.write(GifModifWithTransparentBackgrnd,
      "gif", file);
   }

You can render your transformed image in order to write it:

private void saveImage(Image image, String name) throws IOException {
    BufferedImage bi = new BufferedImage(
        image.getWidth(null), image.getHeight(null),
        BufferedImage.TYPE_INT_ARGB);
    Graphics2D g2d = bi.createGraphics();
    g2d.drawImage(image, 0, 0, null);
    ImageIO.write(bi, "gif", new File(name));
    g2d.dispose();

}

I don't know enough about GIF format to say if that produces the result
you want. See this thread "Regarding transparent gif creation":

http://forums.sun.com/thread.jspa?threadID=5337139

catch (IOException e) {}

Don't swallow exceptions; at least write

ex.printStackTrace();

[...]
--
John B. Matthews
trashgod at gmail dot com
<http://sites.google.com/site/drjohnbmatthews>- Hide quoted text -

- Show quoted text -

Hi John,
Thanks so much for your "saveImage" help.
I have also corrected the "catch" errors you mentioned.
Within the program the gif transparency is
correct. However, the gif images do not display
with the correct oolors when saved.
The items listed in your link were observed.

I have written a similar program to use a
gif from a URL and filter out a green color in
a downloaded gif.

Thanks again.
bH