Java Image
Hai eveybody,
Can anyone tell me how to find out whether an image is too dark or bright in Java?
Regards,
Cochu.
Many thanks for your reply, and now I am clear about what to be done. But after applying pixel grabber , I am not getting the value in the format you said but getting values like 0:27. May be my code is not proper, I am giving the piece of code I am using below,
PixelGrabber pixelGrabber=new PixelGrabber(image, 0,0,width,height,false);
try
pixelGrabber.grabPixels();
catch (Exception e)
System.out.println("PixelGrabber exception");
Object m_pixels=(Object)pixelGrabber.getPixels();
byte[] pixels;
pixels = (byte[])m_pixels;
Can you tell me where I did wrong?
Regards,
Cochu.
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static ImageData rotateFull(ImageData srcData, int grad) {
int diagonal =
(int) Math.sqrt(
(srcData.width * srcData.width)
+ (srcData.height * srcData.height));
ImageData destData =
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int corrY = srcData.height / 2;
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float sin_winkel = (float) Math.sin(bogen);
for (int y = 0; y < (srcData.height); y++) {
for (int x = 0; x < (srcData.width); x++) {
x_adj = x - corrX;
y_adj = y - corrY;
x_new = (int) ((x_adj * cos_winkel) - (y_adj * sin_winkel));
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import org.eclipse.swt.events.*;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.widgets.*;
public class RotationSandbox {
private static final Display display=new Display();
private final String title;
private final Image image;
public RotationSandbox(String title, Image image) {
this.title=title;
this.image=image;
public RotationSandbox(String title, ImageData imagedata) {
this(title, new Image(display,imagedata));
public void run() {
final Shell shell = new Shell(display);
shell.addPaintListener(new PaintListener() {
public void paintControl(PaintEvent event) {
// Draw the untainted image
event.gc.drawImage(image, 0, 0);
shell.setText(title);
shell.setSize(image.getImageData().width+20, image.getImageData().height+30);
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch()) {
display.sleep();
image.dispose();
display.dispose();
static ImageData rotateFull(ImageData srcData, int grad) {
int diagonal =
(int) Math.sqrt(
(srcData.width * srcData.width)
+ (srcData.height * srcData.height));
ImageData destData =
new ImageData(diagonal, diagonal, srcData.depth, srcData.palette);
int x_adj, y_adj, x_new, y_new, pixel_data;
int corrX = srcData.width / 2;
int corrY = srcData.height / 2;
int pixels = srcData.height * srcData.width;
double bogen = (grad * Math.PI) / 180;
float cos_winkel = (float) Math.cos(bogen);
float sin_winkel = (float) Math.sin(bogen);
for (int y = 0; y < (srcData.height); y++) {
for (int x = 0; x < (srcData.width); x++) {
x_adj = x - corrX;
y_adj = y - corrY;
x_new = (int) ((x_adj * cos_winkel) - (y_adj * sin_winkel));
y_new = (int) ((x_adj * sin_winkel) + (y_adj * cos_winkel));
pixel_data = srcData.getPixel(x, y);
destData.setPixel(
x_new + (destData.width / 2),
y_new + (destData.height / 2),
pixel_data);
return destData;
// First change: iterate over destination pixels rather than source pixels.
static ImageData rotateDest(ImageData srcData, int theta_deg) {
int diagonal =
(int) Math.sqrt(
(srcData.width * srcData.width)
+ (srcData.height * srcData.height));
ImageData destData =
new ImageData(diagonal, diagonal, srcData.depth, srcData.palette);
final int corrX = srcData.width / 2;
final int corrY = srcData.height / 2;
double bogen = (theta_deg * Math.PI) / 180;
final float cos_winkel = (float) Math.cos(bogen);
final float sin_winkel = (float) Math.sin(bogen);
final int half_diag=diagonal>>1;
for (int y=0; y<diagonal; y++) {
for (int x=0; x<diagonal; x++) {
int x_new=x-half_diag, y_new=y-half_diag;
int x_adj=(int) ((x_new * cos_winkel) + (y_new * sin_winkel));
int y_adj=(int) (-(x_new * sin_winkel) + (y_new * cos_winkel));
int x_old=x_adj+corrX, y_old=y_adj+corrY;
if (x_old>=0 && y_old>=0 && x_old<srcData.width && y_old<srcData.height) {
destData.setPixel(x,y,srcData.getPixel(x_old,y_old));
return destData;
// Second change: replace multiplications with additions.
static ImageData rotateIter(ImageData srcData, int theta_deg) {
int diagonal =
(int) Math.sqrt(
(srcData.width * srcData.width)
+ (srcData.height * srcData.height));
ImageData destData =
new ImageData(diagonal, diagonal, srcData.depth, srcData.palette);
final int corrX = srcData.width / 2;
final int corrY = srcData.height / 2;
double bogen = (theta_deg * Math.PI) / 180;
final float cos_winkel = (float) Math.cos(bogen);
final float sin_winkel = (float) Math.sin(bogen);
final int half_diag=diagonal>>1;
for (int y=0; y<diagonal; y++) {
float x_adj=-half_diag*cos_winkel + (y-half_diag)*sin_winkel + corrX;
float y_adj=half_diag*sin_winkel + (y-half_diag)*cos_winkel + corrY;
for (int x=0; x<diagonal; x++) {
int x_old=(int)x_adj, y_old=(int)y_adj;
if (x_old>=0 && y_old>=0 && x_old<srcData.width && y_old<srcData.height) {
destData.setPixel(x,y,srcData.getPixel(x_old,y_old));
x_adj+=cos_winkel; y_adj-=sin_winkel;
return destData;
// Third change: eliminate those virtual method calls in favour of direct array indexing.
static ImageData rotateArray(ImageData srcData, int theta_deg) {
int diagonal =
(int) Math.sqrt(
(srcData.width * srcData.width)
+ (srcData.height * srcData.height));
ImageData destData =
new ImageData(diagonal, diagonal, srcData.depth, srcData.palette);
final int corrX = srcData.width / 2;
final int corrY = srcData.height / 2;
double bogen = (theta_deg * Math.PI) / 180;
final float cos_winkel = (float) Math.cos(bogen);
final float sin_winkel = (float) Math.sin(bogen);
final int half_diag=diagonal>>1;
int[] src_raster=new int[srcData.width*srcData.height];
srcData.getPixels(0,0,src_raster.length,src_raster,0);
int[] dst_raster=new int[diagonal*diagonal];
for (int y=0; y<diagonal; y++) {
float x_adj=-half_diag*cos_winkel + (y-half_diag)*sin_winkel + corrX;
float y_adj=half_diag*sin_winkel + (y-half_diag)*cos_winkel + corrY;
for (int x=0; x<diagonal; x++) {
int x_old=(int)x_adj, y_old=(int)y_adj;
if (x_old>=0 && y_old>=0 && x_old<srcData.width && y_old<srcData.height) {
dst_raster[x+y*diagonal]=src_raster[x_old+y_old*srcData.width];
x_adj+=cos_winkel; y_adj-=sin_winkel;
destData.setPixels(0,0,dst_raster.length,dst_raster,0);
return destData;
// Fourth change: use fixed-point rather than floating-point.
static ImageData rotateFixpoint(ImageData srcData, int theta_deg) {
int diagonal =
(int) Math.sqrt(
(srcData.width * srcData.width)
+ (srcData.height * srcData.height));
ImageData destData =
new ImageData(diagonal, diagonal, srcData.depth, srcData.palette);
final int corrX = srcData.width / 2;
final int corrY = srcData.height / 2;
double bogen = (theta_deg * Math.PI) / 180;
final int cos=(int)(65536*Math.cos(bogen));
final int sin=(int)(65536*Math.sin(bogen));
final int half_diag=diagonal>>1;
int[] src_raster=new int[srcData.width*srcData.height];
srcData.getPixels(0,0,src_raster.length,src_raster,0);
int[] dst_raster=new int[diagonal*diagonal];
for (int y=0; y<diagonal; y++) {
int x_adj=-half_diag*cos + (y-half_diag)*sin + (corrX<<16);
int y_adj=half_diag*sin + (y-half_diag)*cos + (corrY<<16);
for (int x=0; x<diagonal; x++) {
int x_old=x_adj>>16, y_old=y_adj>>16;
if (x_old>=0 && y_old>=0 && x_old<srcData.width && y_old<srcData.height) {
dst_raster[x+y*diagonal]=src_raster[x_old+y_old*srcData.width];
x_adj+=cos; y_adj-=sin;
destData.setPixels(0,0,dst_raster.length,dst_raster,0);
return destData;
// Fifth change: only iterate over the box we care about.
// I've also done some incrementalising immediately, rather than defer to the
// next version.
static ImageData rotateTrueclip(ImageData srcData, int theta_deg) {
int diagonal =
(int) Math.sqrt(
(srcData.width * srcData.width)
+ (srcData.height * srcData.height));
ImageData destData =
new ImageData(diagonal, diagonal, srcData.depth, srcData.palette);
final int corrX = srcData.width / 2;
final int corrY = srcData.height / 2;
double bogen = (theta_deg * Math.PI) / 180;
final int cos=(int)(65536*Math.cos(bogen));
final int sin=(int)(65536*Math.sin(bogen));
final int half_diag=diagonal>>1;
final int wfix=srcData.width<<16, hfix=srcData.height<<16;
int[] src_raster=new int[srcData.width*srcData.height];
srcData.getPixels(0,0,src_raster.length,src_raster,0);
int[] dst_raster=new int[diagonal*diagonal];
int x_start=-half_diag*(cos+sin)+(corrX<<16)-sin;
int x_end=x_start+diagonal*cos;
int y_start=half_diag*(sin-cos)+(corrY<<16)-cos;
for (int y=0; y<diagonal; y++) {
x_start+=sin; x_end+=sin;
y_start+=cos;
int dxs=0, dxe=diagonal;
// Clip to keep source x-coords in range.
if (cos>0) {
if (x_start<0) dxs=(cos-1-x_start)/cos;
if (x_end>=wfix+cos) dxe=(wfix-x_start+cos-1)/cos;
else if (cos<0) {
if (x_end<cos) dxe=(cos-x_start-cos+1)/cos;
if (x_start>=wfix) dxs=(wfix-x_start+cos-1)/cos;
else if (x_start<0 || x_start>=wfix) continue;
// Clip to keep src y-coords in range, taking into account the
// changes already made to dxs and dxe.
int y_adj=y_start-dxs*sin;
final int y_end=y_start-dxe*sin;
if (sin>0) {
if (y_end<-sin) dxe=(y_start+sin)/sin;
if (y_adj>=hfix) {
dxs=(-hfix+y_start+sin+1)/sin;
y_adj=y_start-dxs*sin;
else if (sin<0) {
if (y_adj<0) {
dxs=(y_start+sin-1)/sin;
y_adj=y_start-dxs*sin;
if (y_end>=hfix-sin) dxe=(y_start-hfix+sin+1)/sin;
else if (y_start<0 || y_start>=hfix) continue;
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int doff=dxs+y*diagonal;
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dst_raster[doff++]=src_raster[x_old+y_old*srcData.width];
x_adj+=cos; y_adj-=sin;
destData.setPixels(0,0,dst_raster.length,dst_raster,0);
return destData;
public static void main(String[] args) {
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int[] raster=new int[100*100];
int roff=0, col=0;
for (int y=0; y<100; y++) {
for (int x=0; x<100; x++) {
raster[roff++]=col;
col+=(1<<16);
col=(col&0xff)+1;
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byte[] picBytes = buffer.getData();After making some changes I would like to write the new bytes to a file. This seems to work as the new picture shows the changes when I look at it.
File newFile = new File("C:/NewPic.jpg");
ImageIO.write(pic,"jpg",newFile);However, when I try to read the newFile using the same method as above I do not get the same bytes. I am using the following code to print the bytes in hex to verify what they are.
BufferedWriter out2 = new BufferedWriter(new FileWriter("pix2.txt"));
for(int x=0; x<picBytes.length; x++)
out2.write((Integer.toString(picBytes[x] & 0xff, 16).toUpperCase()+" "));
}This produces:
7F 7F 7F 7F 7F 7F 7F 7F 7F 7F 7F 7F 7F 7F 7F 7F
7F 7F 7F 7F 7F 7F 7F 7F 7F 7F FF FF 7F FF FF FF
for the bytes that I have made the changes to, and when I try to read from the newly created file I get:
82 7F 7A 82 7F 7A 82 7E 7D 82 7E 7D 82 7D 7F 82
7D 7F 82 7B 82 82 7B 82 AC A5 AC B4 AE B3 E0 DA
but there is nothing wrong with the picture. Do I need to create a new BufferedImage before I save, or what could be causing this change?Hmmm... I'm not sure what you are doing or what your goal is, but are you aware that JPEGs tend to use a losey compression?
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