Sepia Image effect in Blackberry - blackberry

Question

I am trying to apply Sepia effect on an Image in Blackberry.
I have tried it but doesn't get the 100% sepia effect.
This is code that I have tried for sepia effect.
I have used getARGB() and setARGB() methods of bitmap class.
public Bitmap changetoSepiaEffect(Bitmap bitmap) {
int sepiaIntensity=30;//value lies between 0-255. 30 works well
// Play around with this. 20 works well and was recommended
// by another developer. 0 produces black/white image
int sepiaDepth = 20;
int w = bitmap.getWidth();
int h = bitmap.getHeight();
// WritableRaster raster = img.getRaster();
// We need 3 integers (for R,G,B color values) per pixel.
int[] pixels = new int[w*h*3];
// raster.getPixels(0, 0, w, h, pixels);
bitmap.getARGB(pixels, 0, w, x, y, w, h);
// Process 3 ints at a time for each pixel.
// Each pixel has 3 RGB colors in array
for (int i=0;i<pixels.length; i+=3) {
int r = pixels[i];
int g = pixels[i+1];
int b = pixels[i+2];
int gry = (r + g + b) / 3;
r = g = b = gry;
r = r + (sepiaDepth * 2);
g = g + sepiaDepth;
if (r>255) r=255;
if (g>255) g=255;
if (b>255) b=255;
// Darken blue color to increase sepia effect
b-= sepiaIntensity;
// normalize if out of bounds
if (b<0) {
b=0;
}
if (b>255) {
b=255;
}
pixels[i] = r;
pixels[i+1]= g;
pixels[i+2] = b;
}
//raster.setPixels(0, 0, w, h, pixels);
bitmap.setARGB(pixels, 0, w, 0, 0, w, h);
return bitmap;
}

Answer 1

This call:
bitmap.getARGB(pixels, 0, w, x, y, w, h);
returns an int[] array where each int represents a color in the format 0xAARRGGBB. This differs from you previous code using JavaSE's Raster class.
EDIT: The method fixed for BlackBerry:
public static Bitmap changetoSepiaEffect(Bitmap bitmap) {
int sepiaIntensity = 30;// value lies between 0-255. 30 works well
// Play around with this. 20 works well and was recommended
// by another developer. 0 produces black/white image
int sepiaDepth = 20;
int w = bitmap.getWidth();
int h = bitmap.getHeight();
// Unlike JavaSE's Raster, we need an int per pixel
int[] pixels = new int[w * h];
// We get the whole image
bitmap.getARGB(pixels, 0, w, 0, 0, w, h);
// Process each pixel component. A pixel comes in the format 0xAARRGGBB.
for (int i = 0; i < pixels.length; i++) {
int r = (pixels[i] >> 16) & 0xFF;
int g = (pixels[i] >> 8) & 0xFF;
int b = pixels[i] & 0xFF;
int gry = (r + g + b) / 3;
r = g = b = gry;
r = r + (sepiaDepth * 2);
g = g + sepiaDepth;
if (r > 255)
r = 255;
if (g > 255)
g = 255;
if (b > 255)
b = 255;
// Darken blue color to increase sepia effect
b -= sepiaIntensity;
// normalize if out of bounds
if (b < 0) {
b = 0;
}
if (b > 255) {
b = 255;
}
// Now we compose a new pixel with the modified channels,
// and an alpha value of 0xFF (full opaque)
pixels[i] = ((r << 16) & 0xFF0000) | ((g << 8) & 0x00FF00) | (b & 0xFF) | 0xFF000000;
}
// We return a new Bitmap. Trying to modify the one passed as parameter
// could throw an exception, since in BlackBerry not all Bitmaps are modifiable.
Bitmap ret = new Bitmap(w, h);
ret.setARGB(pixels, 0, w, 0, 0, w, h);
return ret;
}