Blackberry - how to resize image?

Question

I wanted to know if we can resize an image. Suppose if we want to draw an image of 200x200 actual size with a size of 100 x 100 size on our blackberry screen.

Thanks

Answer 1

I'm not a Blackberry programmer, but I believe some of these links will help you out:

Image Resizing Article
Resizing a Bitmap on the Blackberry
Blackberry Image Scaling Question

Answer 2

Just an alternative:
BlackBerry - draw image on the screen
BlackBerry - image 3D transform

Answer 3

Keep in mind that the default image scaling done by BlackBerry is quite primitive and generally doesn't look very good. If you are building for 5.0 there is a new API to do much better image scaling using filters such as bilinear or Lanczos.

Answer 4

You can do this pretty simply using the EncodedImage.scaleImage32() method. You'll need to provide it with the factors by which you want to scale the width and height (as a Fixed32).

Here's some sample code which determines the scale factor for the width and height by dividing the original image size by the desired size, using RIM's Fixed32 class.

public static EncodedImage resizeImage(EncodedImage image, int newWidth, int newHeight) {
    int scaleFactorX = Fixed32.div(Fixed32.toFP(image.getWidth()), Fixed32.toFP(newWidth));
    int scaleFactorY = Fixed32.div(Fixed32.toFP(image.getHeight()), Fixed32.toFP(newHeight));
    return image.scaleImage32(scaleFactorX, scaleFactorY);
}

If you're lucky enough to be developer for OS 5.0, Marc posted a link to the new APIs that are a lot clearer and more versatile than the one I described above. For example:

public static Bitmap resizeImage(Bitmap originalImage, int newWidth, int newHeight) {
    Bitmap newImage = new Bitmap(newWidth, newHeight);
    originalImage.scaleInto(newImage, Bitmap.FILTER_BILINEAR, Bitmap.SCALE_TO_FILL);
    return newImage;
}

(Naturally you can substitute the filter/scaling options based on your needs.)