Background
I need to rotate images taken by the camera so that they will always have a normal orientation.
for this, I use the next code (used this post to get the image orientation)
//<= get the angle of the image , and decode the image from the file
final Matrix matrix = new Matrix();
//<= prepare the matrix based on the EXIF data (based on https://gist.github.com/9re/1990019 )
final Bitmap rotatedBitmap = Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(),matrix,false);
bitmap.recycle();
fileOutputStream = new FileOutputStream(tempFilePath);
rotatedBitmap.compress(CompressFormat.JPEG, 100, fileOutputStream);
rotatedBitmap.recycle();
here the compression rate (AKA "quality" parameter) is 100.
The problem
The code works fine, but the result is larger than the original, much much larger.
The original file is around 600-700 KB, while the resulting file is around 3MB ...
This is even though both the input file and the output file are of the same format (JPEG).
The camera settings are at "super fine" quality. not sure what it means, but I think it has something to do with the compression ratio.
What I've tried
I've tried to set the "filter" parameter to either false or true. both resulted in large files.
Even without the rotation itself (just decode and encode), I get much larger files sizes...
Only when I've set compression ratio to around 85, I get similar files sizes, but I wonder how the quality is affected compared to the original files.
The question
Why does it occur?
Is there a way to get the exact same size and quality of the input file ?
Will using the same compression rate as the original file make it happen? Is it even possible to get the compression rate of the original file?
What does it mean to have a 100% compression rate ?
EDIT: I've found this link talking about rotation of JPEG files without losing the quality and file size , but is there a solution for it on Android ?
Here's another link that says it's possible, but I couldn't find any library that allows rotation of jpeg files without losing their quality