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POBetter option then ImageMagick or Canvas for resizing images in Android
 

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  1. POBetter option then ImageMagick or Canvas for resizing images in Android
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    <p>I trying to achieve good quality image resize in Android. I'm trying all methods listed here on SO and that I could find on Google, but I still can't find a good solution.</p> <p>To exemplify what I'm trying to achieve and what problems I'm having, I'm posting 3 images with the different results. Basically I'm just getting a big image from SD card, resizing and cropping it.</p> <p>Here is the desired result, achieved on Photoshop: <img src="https://i.stack.imgur.com/GXdFu.jpg" alt="resize with photoshop"></p> <p>And this is when I use the tradicional method of drawing on canvas <img src="https://i.stack.imgur.com/uCiXp.jpg" alt="draw on canvas"></p> <p>And this result is when I use ImageMagick. It's better, but in some devices it takes minutes to resize (not cool for a mobile app) <img src="https://i.stack.imgur.com/HzO0Z.jpg" alt="resize with imagemagick"></p> <p>So, here is my code using the canvas method:</p> <pre><code>BitmapFactory.Options o = new BitmapFactory.Options(); o.inJustDecodeBounds = true; BitmapFactory.decodeFile(params[0].path_source, o); BitmapFactory.Options options = new BitmapFactory.Options(); options.inPreferredConfig = Bitmap.Config.ARGB_8888; options.inDither = false; options.inPurgeable = true; options.inScaled = false; options.inPreferQualityOverSpeed = true; options.inSampleSize = Utils.calculateInSampleSize(o, 640, 640); Bitmap image = BitmapFactory.decodeFile(params[0].path_source, options); ... calculate right x, y for cropping .. Matrix m = new Matrix(); m.postScale(new_width/(float)width, new_width/(float)width); m.postRotate(rotation); Bitmap result = Bitmap.createBitmap(640, 640, Config.ARGB_8888); Canvas canvas = new Canvas(result); canvas.setMatrix(m); Paint paint = new Paint(); paint.setAntiAlias(true); paint.setFilterBitmap(true); paint.setDither(true); canvas.drawBitmap(image, -x, -y, paint); FileOutputStream fos = activity.openFileOutput(Utils.NOME_ARQUIVO_FOTO, Context.MODE_PRIVATE); result.compress(CompressFormat.JPEG, 100, fos); fos.close(); </code></pre> <p>Now here is the code using ImageMagick:</p> <pre><code>ImageInfo info = new ImageInfo(params[0].path_source); MagickImage image = new MagickImage(info); //I can optionally use sampleImage for better performance, but worse quality (still better then android canvas) //image = image.sampleImage(new_sampled_width, new_sampled_height); image = image.scaleImage(new_width, new_height); image = image.cropImage(new Rectangle(x, y, 640, 640)); image = image.rotateImage(rotation); byte blob[] = image.imageToBlob(info); FileOutputStream fos = activity.openFileOutput(Utils.NOME_ARQUIVO_FOTO, Context.MODE_PRIVATE); fos.write(blob); fos.close(); </code></pre> <p>Edit: I'm using Android 2.3.4 on a Xperia Play for testing</p> <p>Edit 2: Saving with CompressFormat.PNG achieves near perfect result! Thanks FunkTheMonk for the tip! Only problem is that I use ImageMagick for blending this image with another later in the code, and I couldn't manage to build ImageMagick with PNG support</p>
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    1. PTQuestion
    1. USPaulo Cesar
    1. USPaulo Cesar
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    1. COYou might wish to explain *precisely* what you do not like about your two candidate output images.
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      1. POBetter option then ImageMagick or Canvas for resizing images in Android
      1. USCommonsWare
    2. COThey look ok to me... is the performance you're worried about?
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      1. POBetter option then ImageMagick or Canvas for resizing images in Android
      1. USFunkTheMonk
    3. COLook at the color banding in the white parts of the photo. Thanks!
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      1. POBetter option then ImageMagick or Canvas for resizing images in Android
      1. USPaulo Cesar
 

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