First make sure that both return values in the same format (Android returns
ARGB not RGBA.) Also, f I remember correctly, Java2D can apply color
profiles when loading a bitmap.
On Feb 3, 2012 11:05 AM, "Ergen" <[email protected]> wrote:
> Hi. I want to compare two images. One image is on the android client
> and another image is on the server (with Tomcat, JDK). I need also to
> calculate two histograms - one for each image - and to compare they
>
> The problem is: getPixel (x, y) (on Android) and getRGB (x, y) (JDK)
> return different rgb color numbers for the point with the same
> coordinates (x, y). The images are here identical (JPG, Size: 3x3).
>
> Why are the results different? And what to do? I've been looking for
> the answer everywhere, but...
>
> ***************************************
> Pseudocode for Androids Activity
> ***************************************
> BitmapFactory.Options opt = new BitmapFactory.Options();
> opt.inPreferredConfig = Bitmap.Config.ARGB_8888;
>
> mBitmap = BitmapFactory.decodeFile(imageSource, opt);
>
> int intColor = 0;
> for (int x = 0; x < mBitmap.getWidth(); x++) {
> for (int y = 0; y < mBitmap.getHeight(); y++) {
> intColor = mBitmap.getPixel(x, y);
> System.out.print(" ("+ x + ","+ y +") c:" + intColor);
> }
> }System.out.println();
>
> Result for example image 3x3:
> (0,0)c:-7882802 (0,1)c:-9859138 (0,2)c:-6507579
> (1,0)c:-12883825 (1,1)c:-6574388 (1,2)c:-7948604
> (2,0)c:-7489593 (2,1)c:-10579009 (2,2)c:-6573359
>
>
> ************************
> Pseudocode for JDK
> ************************
> BufferedImage img = ImageIO.read( file );
>
> int intColor = 0;
> for ( int x = 0; x < img.getWidth(); x++ ) {
> for ( int y = 0; y < img.getHeight(); y++ ) {
> intColor = img.getRGB( x, y );
> System.out.print(" ("+ x + ","+ y +") c:" + intColor);
> }
> }System.out.println();
>
> Result for the same image:
> (0,0)c:-7883056 (0,1)c:-9728065 (0,2)c:-6507579
> (1,0)c:-12818030 (1,1)c:-6377523 (1,2)c:-7883323
> (2,0)c:-7424055 (2,1)c:-10513470 (2,2)c:-6573358
>
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