我想在拍攝照片後縮小位圖的大小。我能夠減小尺寸到最大900KB,但我婉,以減少進一步儘可能拍照後壓縮位圖或字節[]
首先我這樣做:
public static Bitmap decodeSampledBitmapFromResource(byte[] data,
int reqWidth, int reqHeight) {
//reqWidth is 320
//reqHeight is 480
// First decode with inJustDecodeBounds=true to check dimensions
final BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
BitmapFactory.decodeByteArray(data, 0, data.length, options);
// Calculate inSampleSize
options.inSampleSize = calculateInSampleSize(options, reqWidth, reqHeight);
// Decode bitmap with inSampleSize set
options.inJustDecodeBounds = false;
return BitmapFactory.decodeByteArray(data, 0, data.length, options);
}
public static int calculateInSampleSize(BitmapFactory.Options options, int reqWidth, int reqHeight) {
final int height = options.outHeight;
final int width = options.outWidth;
int inSampleSize = 1;
if (height > reqHeight || width > reqWidth) {
final int halfHeight = height/2;
final int halfWidth = width/2;
while ((halfHeight/inSampleSize) > reqHeight
&& (halfWidth/inSampleSize) > reqWidth) {
inSampleSize *= 2;
}
}
return inSampleSize;
}
那麼這
bitmap.compress(Bitmap.CompressFormat.PNG, 10, fos);
我如何壓縮位圖進一步?或 我應該壓縮字節[]嗎? 我只是想發送文件,黑色和白色。
有沒有其他選項可以設置使它變成灰度? –
要將圖像轉換爲灰度,您可以在這裏查看: http://stackoverflow.com/questions/8381514/android-converting-color-image-to-grayscale 但是,這不會減少您的文件大小。 –