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Add readme section about working with damaged images

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Sam Stephens 2024-11-28 15:16:22 +13:00 committed by Harald Kuhr
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@ -223,6 +223,41 @@ BufferedImageOp ditherer = new DiffusionDither();
BufferedImage output = ditherer.filter(input, null); BufferedImage output = ditherer.filter(input, null);
``` ```
#### Working with damaged images
When using the normal patterns for loading images, trying to load a damaged image will result in an Exception being thrown.
```java
BufferedImage image = null;
try {
image = ImageIO.read(file);
} catch (IOException exception) {
// TODO: Optionally handle, log a warning/error etc
}
```
In this scenario, if the image is damaged, and `ImageIO.read` throws an exception, `image` is still null - it's not possible for a function to both return a value and throw an exception.
However, in some cases it may be possible to get usable image data from a damaged image. The way to do this is use an `ImageReadParam` to set a `BufferedImage` as a destination.
```java
ImageReadParam param = reader.getDefaultReadParam();
int width = reader.getWidth(0);
int height = reader.getHeight(0);
BufferedImage image = reader.getRawImageType(0).createBufferedImage(width, height);
param.setDestination(image);
try {
reader.read(0, param);
}
catch (IOException e) {
// TODO: Optionally handle, log a warning/error etc
}
```
In theory this should work for all plugins, but the result is very much plugin/implementation specific. With some formats and some forms of damaged file, you may get an image that is mostly useful.
However you should be prepared for the possibility this just gives a blank or empty image.
## Building ## Building
Download the project (using [Git](https://git-scm.com/downloads)): Download the project (using [Git](https://git-scm.com/downloads)):