vipulasri/ImageCompression

Cool!

Thanks a lot bro 👍

Hi,
It works great. Thanks a lot.
But if I want to compress the image size according to me. Then which field should I change.

Hi,
what method is used in whastaup like ?? is lossy or lossless

Kotlin implementation if anyone interested...

fun compressImage(context: Context, imagePath: String): String? {
        var scaledBitmap: Bitmap?

        val options = BitmapFactory.Options()
        options.inJustDecodeBounds = true
        @Suppress("VARIABLE_WITH_REDUNDANT_INITIALIZER")
        var bmp: Bitmap? = BitmapFactory.decodeFile(imagePath, options)

        var actualHeight = options.outHeight
        var actualWidth = options.outWidth

        var imgRatio = actualWidth.toFloat() / actualHeight.toFloat()
        val maxRatio = maxWidth / maxHeight

        if (actualHeight > maxHeight || actualWidth > maxWidth) {
            if (imgRatio < maxRatio) {
                imgRatio = maxHeight / actualHeight
                actualWidth = (imgRatio * actualWidth).toInt()
                actualHeight = maxHeight.toInt()
            } else if (imgRatio > maxRatio) {
                imgRatio = maxWidth / actualWidth
                actualHeight = (imgRatio * actualHeight).toInt()
                actualWidth = maxWidth.toInt()
            } else {
                actualHeight = maxHeight.toInt()
                actualWidth = maxWidth.toInt()

            }
        }

        options.inSampleSize = calculateInSampleSize(options, actualWidth, actualHeight)
        options.inJustDecodeBounds = false
        options.inDither = false
        options.inPurgeable = true
        options.inInputShareable = true
        options.inTempStorage = ByteArray(16 * 1024)

        try {
            bmp = BitmapFactory.decodeFile(imagePath, options)
        } catch (exception: OutOfMemoryError) {
            exception.printStackTrace()
            return null
        }

        try {
            scaledBitmap = Bitmap.createBitmap(actualWidth, actualHeight, Bitmap.Config.RGB_565)
        } catch (exception: OutOfMemoryError) {
            exception.printStackTrace()
            return null
        }

        val ratioX = actualWidth / options.outWidth.toFloat()
        val ratioY = actualHeight / options.outHeight.toFloat()
        val middleX = actualWidth / 2.0f
        val middleY = actualHeight / 2.0f

        val scaleMatrix = Matrix()
        scaleMatrix.setScale(ratioX, ratioY, middleX, middleY)

        val canvas = Canvas(scaledBitmap)
        canvas.matrix = scaleMatrix
        canvas.drawBitmap(bmp, middleX - bmp!!.width / 2, middleY - bmp.height / 2, Paint(FILTER_BITMAP_FLAG))

        bmp.recycle()

        val exif: ExifInterface
        try {
            exif = ExifInterface(imagePath)
            val orientation = exif.getAttributeInt(ExifInterface.TAG_ORIENTATION, ExifInterface.ORIENTATION_UNDEFINED)
            val matrix = Matrix()
            when (orientation) {
                ExifInterface.ORIENTATION_ROTATE_90 -> matrix.postRotate(90f)
                ExifInterface.ORIENTATION_ROTATE_180 -> matrix.postRotate(180f)
                ExifInterface.ORIENTATION_ROTATE_270 -> matrix.postRotate(270f)
            }
            scaledBitmap = Bitmap.createBitmap(scaledBitmap!!, 0, 0, scaledBitmap.width, scaledBitmap.height, matrix, true)
        } catch (e: IOException) {
            e.printStackTrace()
        }

        val out: FileOutputStream?
        val filepath = getFilename(context)
        try {
            out = FileOutputStream(filepath)
            //write the compressed bitmap at the destination specified by filename.
            scaledBitmap!!.compress(Bitmap.CompressFormat.JPEG, 80, out)

        } catch (e: FileNotFoundException) {
            e.printStackTrace()
        }

        return filepath
    }

    private fun calculateInSampleSize(options: BitmapFactory.Options, reqWidth: Int, reqHeight: Int): Int {
        val height = options.outHeight
        val width = options.outWidth
        var inSampleSize = 1

        if (height > reqHeight || width > reqWidth) {
            val heightRatio = Math.round(height.toFloat() / reqHeight.toFloat())
            val widthRatio = Math.round(width.toFloat() / reqWidth.toFloat())
            inSampleSize = if (heightRatio < widthRatio) heightRatio else widthRatio
        }
        val totalPixels = (width * height).toFloat()
        val totalReqPixelsCap = (reqWidth * reqHeight * 2).toFloat()

        while (totalPixels / (inSampleSize * inSampleSize) > totalReqPixelsCap) {
            inSampleSize++
        }

        return inSampleSize
    }

    private fun getFilename(context: Context): String {
        val mediaStorageDir = File("${Environment.getExternalStorageDirectory()}/Android/data/${context.applicationContext.packageName}/Files/Compressed")
        // Create the storage directory if it does not exist
        if (!mediaStorageDir.exists()) {
            mediaStorageDir.mkdirs()
        }

        val mImageName = "IMG_" + System.currentTimeMillis().toString() + ".jpg"
        return mediaStorageDir.getAbsolutePath() + "/" + mImageName
    }

scaledBitmap = Bitmap.createBitmap(actualWidth, actualHeight, Bitmap.Config.RGB_565) at this line , i am getting exception that actual width and height is greater than 0

I too have the same issues!

scaledBitmap = Bitmap.createBitmap(actualWidth, actualHeight, Bitmap.Config.RGB_565) at this line , i am getting exception that actual width and height is greater than 0

Please give me a solution of this exception!!!

scaledBitmap = Bitmap.createBitmap(actualWidth, actualHeight, Bitmap.Config.RGB_565) at this line , i am getting exception that actual width and height is greater than 0

Please give me a solution of this exception @vipulasri

scaledBitmap = Bitmap.createBitmap(actualWidth, actualHeight, Bitmap.Config.RGB_565) at this line , i am getting exception that actual width and height is greater than 0

Please give me a solution of this exception!!!

Add Try Catch block around the bitmap creation

Thank you for your solution. I used this in my app but I want to increase the quality of image.
Where should I make the change ?

scaledBitmap!!.compress(Bitmap.CompressFormat.JPEG, 80, out)
make above code 100% to achieve similar quality.
Refer RGB manpulation algo, to increase the quality of code

That´s awesome, great work!

sir i passed the image path directly to the class by writing :

new ImageCompression(context).execute("content://com.android.providers.media.documents/document/image%3A20702");

but its showing error

can you please help me out with this

Caused by: java.lang.IllegalArgumentException: width and height must be > 0. in "scaledBitmap = Bitmap.createBitmap(actualWidth, actualHeight, Bitmap.Config.RGB_565) "
please help me...

Work like Pro...Thank you.

inPurgeable and inInputShareable deprecated

any solution

I am getting error java.lang.IllegalArgumentException: width and height must be > 0

I am getting error java.lang.IllegalArgumentException: width and height must be > 0

SAME HERE

I am getting error java.lang.IllegalArgumentException: width and height must be > 0

pass actual path of image instead of content Uri to avoid this exception.

Dart implementation if anyone needs it

import 'dart:io';
import 'dart:math';
import 'package:flutter/foundation.dart';
import 'package:image/image.dart' as img;
import 'package:path_provider/path_provider.dart';
import 'package:exif/exif.dart';

class ImageCompression {
  static const double maxHeight = 1280.0;
  static const double maxWidth = 1280.0;

  static Future<String?> compressImage(String imagePath) async {
    File imageFile = File(imagePath);
    img.Image? image = img.decodeImage(await imageFile.readAsBytes());

    if (image == null) return null;

    int actualWidth = image.width;
    int actualHeight = image.height;

    double imgRatio = actualWidth / actualHeight;
    double maxRatio = maxWidth / maxHeight;

    if (actualHeight > maxHeight || actualWidth > maxWidth) {
      if (imgRatio < maxRatio) {
        imgRatio = maxHeight / actualHeight;
        actualWidth = (imgRatio * actualWidth).round();
        actualHeight = maxHeight.round();
      } else if (imgRatio > maxRatio) {
        imgRatio = maxWidth / actualWidth;
        actualHeight = (imgRatio * actualHeight).round();
        actualWidth = maxWidth.round();
      } else {
        actualHeight = maxHeight.round();
        actualWidth = maxWidth.round();
      }
    }

    image = img.copyResize(image, width: actualWidth, height: actualHeight);

    // Check EXIF data for orientation
    Map<String, IfdTag> exifData = await readExifFromBytes(await imageFile.readAsBytes());
    int orientation = exifData['Image Orientation']?.values[0] ?? 1;

    switch (orientation) {
      case 3:
        image = img.copyRotate(image, 180);
        break;
      case 6:
        image = img.copyRotate(image, 90);
        break;
      case 8:
        image = img.copyRotate(image, 270);
        break;
    }

    List<int> compressedImage = img.encodeJpg(image, quality: 80);

    String filepath = await getFilename();
    File(filepath).writeAsBytesSync(compressedImage);

    return filepath;
  }

  static int calculateInSampleSize(img.Image image, int reqWidth, int reqHeight) {
    final int height = image.height;
    final int width = image.width;
    int inSampleSize = 1;

    if (height > reqHeight || width > reqWidth) {
      final int heightRatio = (height / reqHeight).round();
      final int widthRatio = (width / reqWidth).round();
      inSampleSize = min(heightRatio, widthRatio);
    }

    final double totalPixels = width * height;
    final double totalReqPixelsCap = reqWidth * reqHeight * 2;

    while (totalPixels / (inSampleSize * inSampleSize) > totalReqPixelsCap) {
      inSampleSize++;
    }

    return inSampleSize;
  }

  static Future<String> getFilename() async {
    Directory appDocDir = await getApplicationDocumentsDirectory();
    String appDocPath = appDocDir.path;
    
    Directory compressedDir = Directory('$appDocPath/Compressed');
    if (!await compressedDir.exists()) {
      await compressedDir.create(recursive: true);
    }

    String mImageName = "IMG_${DateTime.now().millisecondsSinceEpoch}.jpg";
    String uriString = '${compressedDir.path}/$mImageName';
    return uriString;
  }
}