Serializing BufferedImage with keeping transparency

[Spitfire777]

Hi,

I serialize BufferedImage by using this class:

public class ServerUserAvatarMessage extends ServerMessage {
private static final long serialVersionUID = 6796478081410599600L;

private boolean success = false;
private boolean useDefaultAvatar = true;
private String username = null;

int width; int height; int[] pixels;

public void setAvatar(BufferedImage bi) {
width = bi.getWidth();
height = bi.getHeight();
pixels = new int[width * height];
int[] tmp = bi.getRGB(0, 0, width, height, pixels, 0, width);
}

/**
* @return the avatar
*/
public BufferedImage getAvatar() {
BufferedImage bi = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
bi.setRGB(0, 0, width, height, pixels, 0, width);
return bi;
}

/**
* @return the username
*/
public String getUsername() {
return username;
}

/**
* @param username the username to set
*/
public void setUsername(String username) {
this.username = username;
}

/**
* @return the success
*/
public boolean isSuccess() {
return success;
}

/**
* @param success the success to set
*/
public void setSuccess(boolean success) {
this.success = success;
}

/**
* @return the useDefaultAvatar
*/
public boolean isUseDefaultAvatar() {
return useDefaultAvatar;
}

/**
* @param useDefaultAvatar the useDefaultAvatar to set
*/
public void setUseDefaultAvatar(boolean useDefaultAvatar) {
this.useDefaultAvatar = useDefaultAvatar;
}
}


But if i send png files using transparency, transparency is not displayed by the output file. :(

[Maxideon]

Your getAvatar method returns a BufferedImage that doesn't support transparency. That's probably the problem.

On a side note, I think most people would probably encode the BufferedImage into any one of the available formats (jpeg, png, gif, ect...) and save/send the encoded byte[] array instead of saving/sending the int[] rgb array. The space requirements of images in raw format (read: the int[] rgb array) is not a thing you should underestimate.

[toadaly]

Change

BufferedImage bi = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);

to

BufferedImage bi = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);