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POAndroid: Resize a large bitmap file to scaled output file
 

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  1. POAndroid: Resize a large bitmap file to scaled output file
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    <p>I have a large bitmap (say 3888x2592) in a file. Now, I want to resize that bitmap to 800x533 and save it to another file. I normally would scale the bitmap by calling <code>Bitmap.createBitmap</code> method but it needs a source bitmap as the first argument, which I can't provide because loading the original image into a Bitmap object would of course exceed the memory (see <a href="https://stackoverflow.com/questions/477572/android-strange-out-of-memory-issue">here</a>, for example).</p> <p>I also can't read the bitmap with, for example, <code>BitmapFactory.decodeFile(file, options)</code>, providing a <code>BitmapFactory.Options.inSampleSize</code>, because I want to resize it to an exact width and height. Using <code>inSampleSize</code> would resize the bitmap to 972x648 (if I use <code>inSampleSize=4</code>) or to 778x518 (if I use <code>inSampleSize=5</code>, which isn't even a power of 2).</p> <p>I would also like to avoid reading the image using inSampleSize with, for example, 972x648 in a first step and then resizing it to exactly 800x533 in a second step, because the quality would be poor compared to a direct resizing of the original image.</p> <p>To sum up my question: Is there a way to read a large image file with 10MP or more and save it to a new image file, resized to a specific new width and height, without getting an OutOfMemory exception?</p> <p>I also tried <code>BitmapFactory.decodeFile(file, options)</code> and setting the Options.outHeight and Options.outWidth values manually to 800 and 533, but it doesn't work that way.</p>
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    1. CONo, the outHeight and outWidth are *out* parameters from the decode method. That being said, I have the same issue than you, and I'm not very satisfied with the 2 steps approach ever.
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