[android-developers] Re: Image comparison problem: getPixel() in android and getRGB() in JDK return different values for the same image
The problem was the JPG format. With PNG it works
On 4 Feb., 01:42, gjs garyjamessi...@gmail.com wrote:
Hi,
Also maybe try .png format if possible.
Regards
On Feb 4, 8:21 am, Romain Guy romain...@android.com wrote:
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 andv...@googlemail.com 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_;
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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[android-developers] Re: Image comparison problem: getPixel() in android and getRGB() in JDK return different values for the same image
The problem was the JPG format.
On 3 Feb., 22:21, Romain Guy romain...@android.com wrote:
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 andv...@googlemail.com 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_;
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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[android-developers] Re: Image comparison problem: getPixel() in android and getRGB() in JDK return different values for the same image
Thanks.
I've thought about it. And I tried to change the format _after_
loading the image.
I created a new image IMG2 with new BufferedImage(width, hight,
IMAGE_TYPE) and copied old image (also IMG1) into the new image
as IMG2.createGraphics().drawRenderedImage(IMG1,null)
Then i've tested all the formats in Java2D (all constans of
IMAGE_TYPE). All in vain.
Also, f I remember correctly, Java2D can apply color
profiles when loading a bitmap.
That would be perfect. But I found no method to make it.
I'll try it again in the evening...
On 3 Feb., 22:21, Romain Guy romain...@android.com wrote:
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 andv...@googlemail.com 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_;
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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[android-developers] Re: Image comparison problem: getPixel() in android and getRGB() in JDK return different values for the same image
Thanks. I tried it once, but that changed nothing.
I'll try it again. I need solve the problem somehow. :)
On 4 Feb., 01:42, gjs garyjamessi...@gmail.com wrote:
Hi,
Also maybe try .png format if possible.
Regards
On Feb 4, 8:21 am, Romain Guy romain...@android.com wrote:
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 andv...@googlemail.com 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_;
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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[android-developers] Re: Image comparison problem: getPixel() in android and getRGB() in JDK return different values for the same image
Hi,
Also maybe try .png format if possible.
Regards
On Feb 4, 8:21 am, Romain Guy romain...@android.com wrote:
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 andv...@googlemail.com 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_;
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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Groups Android Developers group.
To post to this group, send email to android-developers@googlegroups.com
To unsubscribe from this group, send email to
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For more options, visit this group at
http://groups.google.com/group/android-developers?hl=en
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