크롭 된 비트맵 이미지 BMP 로 저장 후 파일 알파(배경) 문제

Question

	public void onClick(View v) {

				String mFileName = "face.bmp";
				String savePath = Environment.getExternalStorageDirectory()
						.getAbsolutePath() + "/" + mFileName;

			 // CROPPEDIMAGE <-- 크롭한 후 
				Bitmap resized = resizeBitmap(croppedImage);

				try {
					OutputStream stream = new FileOutputStream(savePath);
				
					BitmapUtils bmpUtil = new BitmapUtils();
					boolean isSaveResult = bmpUtil.save(resized, savePath);
					
					stream.close();
				} catch (FileNotFoundException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				} catch (IOException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}

				mSaveCropPhotePath = savePath;

				Intent intent = new Intent(getApplicationContext(),
						Compose.class);
				//
				//
				intent.putExtra("id", id);
				intent.putExtra("pw", pw);
				intent.putExtra("asdf", movie);
				intent.putExtra("uri", mSaveCropPhotePath);
				intent.putExtra("bm", mSaveCropPhotePath);

				Log.i("LSJ", "========= [compose] 아이디 보냄 ========= :" + id);
				Log.i("LSJ", "========= [compose] 비번 보냄 ========= :" + pw);
				Log.i("LSJ", "======== [compose]  사진 보냄 ========:"
						+ mSaveCropPhotePath);
				Log.i("LSJ", "========= [compose] 동영상보냄 ========= :" + movie);

				startActivity(intent);

				finish();
			}
		});

	}

	public Bitmap resizeBitmap(Bitmap source) {
		Bitmap rbm = resizeBitmapImage(source, 256);

		Bitmap output = Bitmap.createBitmap(256, 256, Config.ARGB_8888);
		Canvas canvas = new Canvas(output);

		final int color = 0xff424242;
		final Paint paint = new Paint();
		paint.setAntiAlias(true);
		canvas.drawARGB(0, 0, 0, 0);
		paint.setColor(color);

		int utop = 0;
		int h = rbm.getHeight();
		if (h < 256) {
			utop = 256 - h;
			utop = utop / 2;
		}

		int uleft = 0;
		int w = rbm.getWidth();
		if (w < 256) {
			uleft = 256 - w;
			uleft = uleft / 2;
		}

		canvas.drawBitmap(rbm, uleft, utop, new Paint());
		return output;
	}
	public Bitmap resizeBitmapImage(Bitmap source, int maxResolution) {
		int width = source.getWidth();
		int height = source.getHeight();
		int newWidth = width;
		int newHeight = height;
		float rate = 0.0f;

		if (width > height) {
			if (maxResolution < width) {
				rate = maxResolution / (float) width;
				newHeight = (int) (height * rate);
				newWidth = maxResolution;
			}
		} else {
			if (maxResolution < height) {
				rate = maxResolution / (float) height;
				newWidth = (int) (width * rate);
				newHeight = maxResolution;
			}
		}

		return Bitmap.createScaledBitmap(source, newWidth, newHeight, true);
	}

이미지 크롭후에 bmp 파일로 저장하는 부분입니다. 타원으로 크롭후에 크롭부분은 잘나타납니다 근데 배경 알파값이 검은색으로 변하네요 .png 로 했을경우에는 하얀색배경이 나타납니다. 밑에는 bmp 파일 변환하는 부분입니다.

bmp 파일 변환

package com.example.mstar;

import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileDescriptor;
import java.io.FileOutputStream;
import java.io.IOException;
import java.nio.ByteBuffer;

import android.graphics.Bitmap;

/**
 * Android Bitmap Object to .bmp image (Windows BMP v3 24bit) file util class
 * 
 * ref : http://en.wikipedia.org/wiki/BMP_file_format
 * 
 * @author ultrakain ( ultrasonic@gmail.com )
 * @since 2012-09-27
 *
 */
public class BitmapUtils {
	
	private final int BMP_WIDTH_OF_TIMES = 4;
	private final int BYTE_PER_PIXEL = 3;

	/**
	 * Android Bitmap Object to Window's v3 24bit Bmp Format File
	 * @param orgBitmap
	 * @param filePath
	 * @return file saved result
	 */
	public boolean save(Bitmap orgBitmap, String filePath){
		
		if(orgBitmap == null){
			return false;
		}

		if(filePath == null){
			return false;
		}

		boolean isSaveSuccess = true;

		//image size
		int width = orgBitmap.getWidth();
		int height = orgBitmap.getHeight();

		//image dummy data size
		//reason : bmp file's width equals 4's multiple
		int dummySize = 0;
		byte[] dummyBytesPerRow = null;
		boolean hasDummy = false;
		if(isBmpWidth4Times(width)){
			hasDummy = true;
			dummySize = BMP_WIDTH_OF_TIMES - (width % BMP_WIDTH_OF_TIMES);
			dummyBytesPerRow = new byte[dummySize * BYTE_PER_PIXEL];
			for(int i = 0; i < dummyBytesPerRow.length; i++){
				dummyBytesPerRow[i] = (byte)0xFF;
			}
		}
 
		int[] pixels = new int[width * height];
		int imageSize = pixels.length * BYTE_PER_PIXEL + (height * dummySize * BYTE_PER_PIXEL);
		int imageDataOffset = 0x36;
		int fileSize = imageSize + imageDataOffset;

		//Android Bitmap Image Data
		orgBitmap.getPixels(pixels, 0, width, 0, 0, width, height);

		//ByteArrayOutputStream baos = new ByteArrayOutputStream(fileSize);
		ByteBuffer buffer = ByteBuffer.allocate(fileSize);

		try {
			/**
			 * BITMAP FILE HEADER Write Start
			 **/
			buffer.put((byte)0x42);
			buffer.put((byte)0x4D);

			//size
			buffer.put(writeInt(fileSize));

			//reserved
			buffer.put(writeShort((short)0));
			buffer.put(writeShort((short)0));
		
			//image data start offset
			buffer.put(writeInt(imageDataOffset));
		
			/** BITMAP FILE HEADER Write End */

			//*******************************************
		
			/** BITMAP INFO HEADER Write Start */
			//size
			buffer.put(writeInt(0x28));
		
			//width, height
			buffer.put(writeInt(width));
			buffer.put(writeInt(height));
		
			//planes
			buffer.put(writeShort((short)1));
		
			//bit count
			buffer.put(writeShort((short)24));
		
			//bit compression
			buffer.put(writeInt(0));
		
			//image data size
			buffer.put(writeInt(imageSize));
		
			//horizontal resolution in pixels per meter
			buffer.put(writeInt(0));
		
			//vertical resolution in pixels per meter (unreliable)
			buffer.put(writeInt(0));
		
			//컬러 사용 유무
			buffer.put(writeInt(0));
		
			//중요하게 사용하는 색
			buffer.put(writeInt(0));

			/** BITMAP INFO HEADER Write End */
 
			int row = height;
			int col = width;
			int startPosition = 0;
			int endPosition = 0;
 
			while( row > 0 ){
 	
				startPosition = (row - 1) * col;
				endPosition = row * col;
 		
				for(int i = startPosition; i < endPosition; i++ ){
					buffer.put(write24BitForPixcel(pixels[i]));
  	
					if(hasDummy){
						if(isBitmapWidthLastPixcel(width, i)){
							buffer.put(dummyBytesPerRow);
						}  			
					}
				}
				row--;
			}
 
			FileOutputStream fos = new FileOutputStream(filePath);
			fos.write(buffer.array());
			fos.close();
	
		} catch (IOException e1) {
			e1.printStackTrace();
			isSaveSuccess = false;
		}
		finally{
	
		}

		return isSaveSuccess;
	}

	/**
	 * Is last pixel in Android Bitmap width  
	 * @param width
	 * @param i
	 * @return
	 */
	private boolean isBitmapWidthLastPixcel(int width, int i) {
		return i > 0 && (i % (width - 1)) == 0;
	}

	/**
	 * BMP file is a multiples of 4?
	 * @param width
	 * @return
	 */
	private boolean isBmpWidth4Times(int width) {
		return width % BMP_WIDTH_OF_TIMES > 0;
	}
	
	/**
	 * Write integer to little-endian 
	 * @param value
	 * @return
	 * @throws IOException
	 */
	private byte[] writeInt(int value) throws IOException {
		byte[] b = new byte[4];
 	
		b[0] = (byte)(value & 0x000000FF);
		b[1] = (byte)((value & 0x0000FF00) >> 8);
		b[2] = (byte)((value & 0x00FF0000) >> 16);
		b[3] = (byte)((value & 0xFF000000) >> 24);
  
		return b;
	}
 
	/**
	 * Write integer pixel to little-endian byte array
	 * @param value
	 * @return
	 * @throws IOException
	 */
	private byte[] write24BitForPixcel(int value) throws IOException {
		byte[] b = new byte[3];
 	
		b[0] = (byte)(value & 0x000000FF);
		b[1] = (byte)((value & 0x0000FF00) >> 8);
		b[2] = (byte)((value & 0x00FF0000) >> 16);
  
		return b;
	}

	/**
	 * Write short to little-endian byte array
	 * @param value
	 * @return
	 * @throws IOException
	 */
	private byte[] writeShort(short value) throws IOException {
		byte[] b = new byte[2];
 	
		b[0] = (byte)(value & 0x00FF);
		b[1] = (byte)((value & 0xFF00) >> 8);
		
		return b;
	}
}

Answer 1

bmp 는 alpha 를 가지지 않기 때문에 초기 bitmap 생성 시 drawARGB 하는 부분을 0, 0, 0, 0 에서 0, 255, 255, 255 식으로 변경을 해서 white 로 변경해주세요

Comments

다음엑티비티에 넘겨주면 하얗게 뜨는데요. 파일을 sd카드에도 잘뜨는데 pc로 해서 꺼내보면 이미 손상된파일이거나 용량이 크다고나오네요 ㅠㅠ


                try {
                    OutputStream stream = new FileOutputStream(savePath);
                    // Bitmap testBitmap = BitmapFactory.decodeFile(savePath);
                    BitmapUtils bmpUtil = new BitmapUtils();
                    boolean isSaveResult = bmpUtil.save(resized, savePath);
                    // resized.compress(CompressFormat.BMP, 100, stream);
                    stream.close();
                } catch (FileNotFoundException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
어떻게해야되나요 ㅠㅠ

---

일단  테스트를 해보니 255, 255, 255, 255 로 주셔야 하고

저장에는 문제가 없어 보입니다. saved path 확인 하시고 isSaveResult 가 true 인지도 확인해보세요

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/> 도 확인하시구요

그리고  OutputStream stream = new FileOutputStream(savePath); 와 stream.close(); 는 지우세요
이게 선점해서 save 를 못하는 것 일 수도 있습니다. 파일 저장하는데에 해당 코드는 필요 없습니다.