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Issue 1059 treat transparent areas as white

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git-svn-id: https://zxing.googlecode.com/svn/trunk@2028 59b500cc-1b3d-0410-9834-0bbf25fbcc57
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srowen 2011-11-12 11:05:00 +00:00
parent fe9bdc6974
commit f5df4e5adc
1 changed files with 12 additions and 0 deletions
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javase/src/com/google/zxing/client/j2se/BufferedImageLuminanceSource.java
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@ -47,6 +47,18 @@ public final class BufferedImageLuminanceSource extends LuminanceSource {
if (left + width > sourceWidth || top + height > sourceHeight) {
throw new IllegalArgumentException("Crop rectangle does not fit within image data.");
}
// The color of fully-transparent pixels is irrelevant. They are often, technically, fully-transparent
// black (0 alpha, and then 0 RGB). They are often used, of course as the "white" area in a
// barcode image. Force any such pixel to be white:
for (int i = top; i < top + height; i++) {
for (int j = left; j < left + width; j++) {
if ((image.getRGB(i, j) & 0xFF000000) == 0) {
image.setRGB(i, j, 0xFFFFFFFF); // = white
}
}
}
// Create a grayscale copy, no need to calculate the luminance manually
this.image = new BufferedImage(sourceWidth, sourceHeight, BufferedImage.TYPE_BYTE_GRAY);
this.image.getGraphics().drawImage(image, 0, 0, null);