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From "VVD (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (SANSELAN-68) Incorrect reading Physical Width/Height Dpi and Physical Width/Height from TIFF files
Date Sun, 18 Mar 2012 11:36:42 GMT
Incorrect reading Physical Width/Height Dpi and Physical Width/Height from TIFF files
-------------------------------------------------------------------------------------

                 Key: SANSELAN-68
                 URL: https://issues.apache.org/jira/browse/SANSELAN-68
             Project: Commons Sanselan
          Issue Type: Bug
          Components: Format: TIFF
    Affects Versions: 1.0, 1.1, 1.x
            Reporter: VVD


Width: 3509
Physical Width Dpi: 4650
Physical Width Inch: 1169.667
Height: 2481
Physical Height Dpi: 4650
Physical Height Inch: 827.00024

{code}
TiffImageParser.java (196):
-        case 3: // Meter
-            unitsPerInch = 0.0254;
+        case 3: // Centimeter
+            unitsPerInch = 2.54;
(c) http://partners.adobe.com/public/developer/en/tiff/TIFF6.pdf

TiffImageParser.java (218):
-                physicalWidthDpi = (int) (XResolutionPixelsPerUnit / unitsPerInch);
+                physicalWidthDpi = (int) Math.round(XResolutionPixelsPerUnit * unitsPerInch);
TiffImageParser.java (226):
-                physicalHeightDpi = (int) (YResolutionPixelsPerUnit / unitsPerInch);
+                physicalHeightDpi = (int) Math.round(YResolutionPixelsPerUnit * unitsPerInch);
{code}

After this patch I got correct values:
Width: 3509
Physical Width Dpi: 300
Physical Width Inch: 11.69667
Height: 2481
Physical Height Dpi: 300
Physical Height Inch: 8.2700024

May be need to patch writing of tiff image too - don't know.

P.S. GIMP show values: 300,000, 300,000, 11,697, 8,270.

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