I believe the bitmap codec has a floating point truncation error that
causes a 300 dpi bitmap to be processed as 299 dpi. A 300 dpi image
specifies an xPelsPerMeter of 11811, which is multiplied by 0.0254
(one inch in meters), yielding an effective DPI of 299.9994. I do
not think it is correct to truncate this when converting to an integer.
The correct method IMHO is to convert the double to a float, then
round the float to an integer. The following diff achieves the correct
results.
Comments?
Index: com/lowagie/text/pdf/codec/BmpImage.java
===================================================================
--- com/lowagie/text/pdf/codec/BmpImage.java 6 Jun 2007 23:09:56 -0000
1.1.1.6
+++ com/lowagie/text/pdf/codec/BmpImage.java 27 Jun 2007 21:36:32 -0000
@@ -203,7 +203,10 @@
BmpImage bmp = new BmpImage(is, noHeader, size);
try {
Image img = bmp.getImage();
- img.setDpi((int)((double)bmp.xPelsPerMeter * 0.0254),
(int)((double)bmp.yPelsPerMeter * 0.0254));
+ img.setDpi(
+ Math.round((float)((double)bmp.xPelsPerMeter * 0.0254)),
+ Math.round((float)((double)bmp.yPelsPerMeter * 0.0254)));
+ System.out.println("bmp dpiX is " + img.getDpiX());
img.setOriginalType(Image.ORIGINAL_BMP);
return img;
}
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