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From "Damjan Jovanovic (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SANSELAN-69) Incorrect reading Physical Width/Height Inch from PNG files
Date Wed, 04 Apr 2012 04:35:19 GMT

    [ https://issues.apache.org/jira/browse/SANSELAN-69?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13246016#comment-13246016
] 

Damjan Jovanovic commented on SANSELAN-69:
------------------------------------------

Please attach the patch as a separate file, and tick the "Grant license to ASF..." checkbox.
That's the only way we can accept patches.

                
> Incorrect reading Physical Width/Height Inch from PNG files
> -----------------------------------------------------------
>
>                 Key: SANSELAN-69
>                 URL: https://issues.apache.org/jira/browse/SANSELAN-69
>             Project: Commons Sanselan
>          Issue Type: Bug
>          Components: Format: PNG
>    Affects Versions: 0.97, 1.0, 1.1, 1.x
>            Reporter: VVD
>              Labels: patch
>
> Width: 3509
> Physical Width Dpi: 300
> Physical Width Inch: 1052697.9
> Height: 2481
> Physical Height Dpi: 300
> Physical Height Inch: 744298.5
> {code}
> PngImageParser.java (620):
>                  PhysicalWidthInch = (float) ((double) Width
> -                        * (double) pngChunkpHYs.PixelsPerUnitXAxis * meters_per_inch);
> +                        / ((double) pngChunkpHYs.PixelsPerUnitXAxis * meters_per_inch));
> PngImageParser.java (625):
>                  PhysicalHeightInch = (float) ((double) Height
> -                        * (double) pngChunkpHYs.PixelsPerUnitYAxis * meters_per_inch);
> +                        / ((double) pngChunkpHYs.PixelsPerUnitYAxis * meters_per_inch));
> {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

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