我正尝试将图像发送到服务器。在发送之前,我正在缩小它的尺寸和质量,然后解决任何旋转问题。我的问题是,旋转图像后,当我保存它时,文件比以前更大。在旋转大小为10092之前和旋转之后是54226压缩质量比原始文件大100的位图
// Scale image to reduce it
Bitmap reducedImage = reduceImage(tempPhotoPath);
// Decrease photo quality
FileOutputStream fos = new FileOutputStream(tempPhotoFile);
reducedImage.compress(CompressFormat.JPEG, 55, fos);
fos.flush();
fos.close();
// Check and fix rotation issues
Bitmap fixed = fixRotation(tempPhotoPath);
if(fixed!=null)
{
FileOutputStream fos2 = new FileOutputStream(tempPhotoFile);
fixed.compress(CompressFormat.JPEG, 100, fos2);
fos2.flush();
fos2.close();
}
public Bitmap reduceImage(String originalPath)
{
// Decode image size
BitmapFactory.Options o = new BitmapFactory.Options();
o.inJustDecodeBounds = true;
o.inPurgeable = true;
o.inInputShareable = true;
BitmapFactory.decodeFile(originalPath, o);
// The new size we want to scale to
final int REQUIRED_SIZE = 320;
// Find the correct scale value. It should be the power of 2.
int width_tmp = o.outWidth, height_tmp = o.outHeight;
int scale = 1;
while (true) {
if (width_tmp/2 < REQUIRED_SIZE || height_tmp/2 < REQUIRED_SIZE) {
break;
}
width_tmp /= 2;
height_tmp /= 2;
scale *= 2;
}
// Decode with inSampleSize
BitmapFactory.Options o2 = new BitmapFactory.Options();
o2.inPurgeable = true;
o2.inInputShareable = true;
o2.inSampleSize = scale;
Bitmap bitmapScaled = null;
bitmapScaled = BitmapFactory.decodeFile(originalPath, o2);
return bitmapScaled;
}
public Bitmap fixRotation(String path)
{
Bitmap b = null;
try
{
//Find if the picture is rotated
ExifInterface exif = new ExifInterface(path);
int degrees = 0;
if(exif.getAttribute(ExifInterface.TAG_ORIENTATION).equalsIgnoreCase("6"))
degrees = 90;
else if(exif.getAttribute(ExifInterface.TAG_ORIENTATION).equalsIgnoreCase("8"))
degrees = 270;
else if(exif.getAttribute(ExifInterface.TAG_ORIENTATION).equalsIgnoreCase("3"))
degrees = 180;
if(degrees > 0)
{
BitmapFactory.Options o = new BitmapFactory.Options();
o.inPurgeable = true;
o.inInputShareable = true;
Bitmap bitmap = BitmapFactory.decodeFile(path, o);
int w = bitmap.getWidth();
int h = bitmap.getHeight();
Matrix mtx = new Matrix();
mtx.postRotate(degrees);
b = Bitmap.createBitmap(bitmap, 0, 0, w, h, mtx, true);
}
}
catch(Exception e){e.printStackTrace();}
return b;
}
感谢Geobits,但我使用质量100与前生成的文件(质量55),而不是原来的。或者那是我认为我正在做的事。 以质量55保存图像后,文件大小为10092.然后,我拿起该文件,旋转它,并保存质量100,文件大小现在是54226 – 2013-03-05 10:10:12
感谢Geobits,我想我是理解它现在。是否有任何方法可以解决旋转问题,减小尺寸和质量,而不会有比原始文件更大的最终文件? 我尝试做第一次旋转,然后减小大小和质量,但它旋转时给了我OutOfMemoryException。有任何想法吗? – 2013-03-06 11:11:28
已添加到答复 – Geobits 2013-03-06 12:58:02