Java: convert image to byte array, convert byte array to image

if i want to convert image into bmp to .iso how i can convert it??

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can you please help me to show a tif byte array to image in html screen using javascript

Thanks a lot…It helped me pretty much…

import com.sun.org.apache.xerces.internal.impl.dv.util.Base64

Can we convert byte array to audio file??

hello, i have a project on editing images by first converting them to byte arrary, so if you could help me out with which editor should i be using for this? I ‘ll need to save the image as well as the array to access it later on.

If i have a gif animated file means,how can i convert it to byte array and again i have to convert into gif file.

Hi, I tried this code with Jpg, it works perfectly. But with .bmp this is not working. I need to convert a .bmp image to base64 and vice-versa. Is there a different way to handle to .bmp images…pls reply asap. thanks.

sir. . i want java code for converting any color image to matrix form of image data.
this matrix will use for applying further matrx operation. . . so please give me the java code foe matrix cinversion from the image. . plz send to my mail…

[email protected]

why the fuck does it only work with .gif

package com.teli.Image;

/*
*kapil katiyar
*telibrhama
*INDIAN
*/

import java.io.ByteArrayOutputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import javax.microedition.lcdui.Image;

public class PNGEncoder {
private static final byte[] SIGNATURE = new byte[]
{
(byte) 137, (byte) 80, (byte) 78, (byte) 71,
(byte) 13, (byte) 10, (byte) 26, (byte) 10
};

/**
* Generate a PNG data stream from a pixel array.

*/
public static byte[] toPNG(int width, int height, int[] argb, boolean processAlpha) throws IllegalArgumentException {
ByteArrayOutputStream png;
try {
byte[] header = createHeaderChunk(width, height, processAlpha);
byte[] data = createDataChunk(width, height, argb, processAlpha);
byte[] trailer = createTrailerChunk();

png = new ByteArrayOutputStream(SIGNATURE.length + header.length + data.length + trailer.length);
png.write(SIGNATURE);
png.write(header);
png.write(data);
png.write(trailer);
} catch (IOException ioe)
{
// none of the code should ever throw an IOException
throw new IllegalStateException(“Unexpected ” + ioe);
}
return png.toByteArray();
}

/**
* Generate a PNG data stream from an Image object.
* @param img source Image
* @param processAlpha true if you want to keep the alpha channel data
* @return PNG data in a byte[]
*/
public static byte[] toPNG(Image img, boolean processAlpha) {
int width = img.getWidth();
int height = img.getHeight();
int[] argb = new int[width * height];
img.getRGB(argb, 0, width, 0, 0, width, height);
// allow garbage collection, if this is the only reference
img = null;
return toPNG(width, height, argb, processAlpha);
}

private static byte[] createHeaderChunk(int width, int height, boolean processAlpha) throws IOException {
ByteArrayOutputStream baos = new ByteArrayOutputStream(13);
DataOutputStream chunk = new DataOutputStream(baos);
chunk.writeInt(width);
chunk.writeInt(height);
chunk.writeByte(8); // Bitdepth
chunk.writeByte(processAlpha ? 6 : 2); // Colortype ARGB or RGB
chunk.writeByte(0); // Compression
chunk.writeByte(0); // Filter
chunk.writeByte(0); // Interlace
return toChunk(“IHDR”, baos.toByteArray());
}

private static byte[] createDataChunk(int width, int height, int[] argb, boolean processAlpha) throws IOException, IllegalArgumentException {
if (argb.length != (width * height)) {
throw new IllegalArgumentException(“array size does not match image dimensions”);
}
int source = 0;
int dest = 0;
byte[] raw = new byte[(processAlpha ? 4 : 3) * (width * height) + height];
for (int y = 0; y < height; y++) {
raw[dest++] = 0; // No filter
for (int x = 0; x > 16); // red
raw[dest++] = (byte)(pixel >> 8); // green
raw[dest++] = (byte)(pixel); // blue
if (processAlpha) {
raw[dest++] = (byte)(pixel >> 24); // alpha
}
}
}
return toChunk(“IDAT”, toZLIB(raw));
}

private static byte[] createTrailerChunk() throws IOException {

return toChunk(“IEND”, new byte[] {});
}

private static byte[] toChunk(String id, byte[] raw) throws IOException {
ByteArrayOutputStream baos = new ByteArrayOutputStream(raw.length + 12);
DataOutputStream chunk = new DataOutputStream(baos);

chunk.writeInt(raw.length);

byte[] bid = new byte[4];
for (int i = 0; i < 4; i++) {
bid[i] = (byte) id.charAt(i);
}

chunk.write(bid);

chunk.write(raw);

int crc = 0xFFFFFFFF;
crc = updateCRC(crc, bid);
crc = updateCRC(crc, raw);
chunk.writeInt(~crc);

return baos.toByteArray();
}

private static int[] crcTable = null;

private static void createCRCTable() {
crcTable = new int[256];

for (int i = 0; i < 256; i++) {
int c = i;
for (int k = 0; k 0) ? 0xedb88320 ^ (c >>> 1) : c >>> 1;
}
crcTable[i] = c;
}
}

private static int updateCRC(int crc, byte[] raw) {
if (crcTable == null) {
createCRCTable();
}

for (int i = 0; i >> 8);
}

return crc;
}

/*
* This method is called to encode the image data as a zlib block as
* required by the PNG specification. This file comes with a minimal ZLIB
* encoder which uses uncompressed deflate blocks (fast, short, easy, but no
* compression). If you want compression, call another encoder (such as
* JZLib?) here.
*/
private static byte[] toZLIB(byte[] raw) throws IOException {
return ZLIB.toZLIB(raw);
}
}

class ZLIB {
private static final int BLOCK_SIZE = 32000;

public static byte[] toZLIB(byte[] raw) throws IOException {
ByteArrayOutputStream baos = new ByteArrayOutputStream(raw.length + 6
+ (raw.length / BLOCK_SIZE) * 5);
DataOutputStream zlib = new DataOutputStream(baos);

byte tmp = (byte) 8;
zlib.writeByte(tmp); // CM = 8, CMINFO = 0
zlib.writeByte( (31 – ( (tmp < BLOCK_SIZE)
{
writeUncompressedDeflateBlock(zlib, false, raw, pos, (char) BLOCK_SIZE);
pos += BLOCK_SIZE;
}

writeUncompressedDeflateBlock(zlib, true, raw, pos, (char) (raw.length – pos));

// zlib check sum of uncompressed data
zlib.writeInt(calcADLER32(raw));

return baos.toByteArray();
}

private static void writeUncompressedDeflateBlock(DataOutputStream zlib, boolean last,byte[] raw, int off, char len) throws IOException
{
zlib.writeByte((byte) (last ? 1 : 0)); // Final flag, Compression type 0
zlib.writeByte((byte) (len & 0xFF)); // Length LSB
zlib.writeByte((byte) ( (len & 0xFF00) >> 8)); // Length MSB
zlib.writeByte((byte) (~len & 0xFF)); // Length 1st complement LSB
zlib.writeByte((byte) ( (~len & 0xFF00) >> 8)); // Length 1st complement MSB
zlib.write(raw, off, len); // Data
}

private static int calcADLER32(byte[] raw) {
int s1 = 1;
int s2 = 0;
for (int i = 0; i = 0 ? raw[i] : (raw[i] + 256);
s1 = (s1 + abs) % 65521;
s2 = (s2 + s1) % 65521;
}
return (s2 << 16) + s1;
}
}

//Use this there is method
toPNG(Image img, boolean processAlpha);
it must work

🙂
😉

Thank you sir … I really expected this program for my project .

Great piece of code! I am doing an scholar project and I am using your solution to transfer my images. Thanks for sharing with the community.

Thank you…. you’re life saver 😉

thank u sooooo muc.it is really helpful for my projectwork.

Hey I have been trying to use this code and I keep getting the error can’t read file?
any help?

Your code really helps,
am trying to convert base64 data to jpg file,
i have base64 data in database as string, i am passing it to java class as args[0], but this throws arrayindexoutofBoundsException
here is my code

String base64String=args[0];

byte[] bytearray = Base64.decode(base64String);
//Why use Base64 decode?

BufferedImage imag=ImageIO.read(new ByteArrayInputStream(bytearray));
ImageIO.write(imag, “jpg”, new File(dirName,”snap.jpg”));

Great stuff,
But the converted file of SimpleConvertImage is not as clear as that of ConvertImage, Could you please explain?
Regards…

thanks very much for thhis code…
But in the same way i’ve a question:
“how convert byte array to files like pdf,doc,…?”
tx..

than you sir…

Absolutley new to java, althought love to read articles from witch I can learn

good job ….thanks for your help…
yes …this world is because of helpful guys like you….

Thank you sooooo much!

This helped me decode an image byte array sent from flash. So awesome.

SA
Hi Thank you for this declration

am working on this class from two hour ago but i need to seprate store of image from creation method so i read image and convert it to byte array then decoded by base 64 then insert in file

then terminate

then run module to create image which read file then decode string by base 64 then ask for image io to write image i got nullpointer exception