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POTake monochrome picture (black and white) with Android
 

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  1. POTake monochrome picture (black and white) with Android
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    <p>I would like to take a picture in true black and white in my app. I searched for solutions (in this site too), but I always found solution to put a photo in gray scale (for example in <a href="https://stackoverflow.com/questions/9377786/android-converting-a-bitmap-to-a-monochrome-bitmap-1-bit-per-pixel">this topic</a>), but it's not what I am looking for ...</p> <p>I also found a topic proposing this : </p> <pre><code>public static Bitmap createContrast(Bitmap src, double value) { // image size int width = src.getWidth(); int height = src.getHeight(); // create output bitmap Bitmap bmOut = Bitmap.createBitmap(width, height, src.getConfig()); // color information int A, R, G, B; int pixel; // get contrast value double contrast = Math.pow((100 + value) / 100, 2); // scan through all pixels for (int x = 0; x &lt; width; ++x) { for (int y = 0; y &lt; height; ++y) { // get pixel color pixel = src.getPixel(x, y); A = Color.alpha(pixel); // apply filter contrast for every channel R, G, B R = Color.red(pixel); R = (int) (((((R / 255.0) - 0.5) * contrast) + 0.5) * 255.0); if (R &lt; 0) { R = 0; } else if (R &gt; 255) { R = 255; } G = Color.red(pixel); G = (int) (((((G / 255.0) - 0.5) * contrast) + 0.5) * 255.0); if (G &lt; 0) { G = 0; } else if (G &gt; 255) { G = 255; } B = Color.red(pixel); B = (int) (((((B / 255.0) - 0.5) * contrast) + 0.5) * 255.0); if (B &lt; 0) { B = 0; } else if (B &gt; 255) { B = 255; } // set new pixel color to output bitmap bmOut.setPixel(x, y, Color.argb(A, R, G, B)); } } return bmOut; } </code></pre> <p>But the image quality is horrible ...</p> <p>Is anyone having an idea please?</p> <p>Thank you</p>
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    1. COUm..this may be a silly question, but what's the difference between 'true black and white' and grayscale? Both are made in various shades of gray, but is there a specific definition for the terms? Btw , '50 shades' jokes are banned! :)
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    2. CO@Alex - I was wondering the same thing and stumbled across this example http://farm3.staticflickr.com/2393/3533241378_04c2b649c2_b.jpg. The top image is monochrome and bottom is greyscale. I suppose it depends on what the OP is trying to achieve - capture a true monochromatic image from the phone camera in his app or convert existing images? Only reason I ask is because he has already posted examples of converting them after the fact :-)
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    3. CO@shri046 without some words, your example isn't an explanation. Monochrome means one colour against a background of some other colour. Black and white means it's black against a white background. I would guess that the examples you've shown are just converted from colour to B&W using different filters.
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