[jira] [Commented] (IMAGING-139) Invalid DPI value

["Damjan Jovanovic (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/IMAGING-139?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14176246#comment-14176246 ] 

Damjan Jovanovic commented on IMAGING-139:
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with exiftool -a -g -u /path/to/250dpi.jpg I get:

---- JFIF ----
JFIF Version                    : 1.01
Resolution Unit                 : None
X Resolution                    : 1
Y Resolution                    : 1

so that 250 must be some kind of default in the other application?

And we should really deal with Resolution Unit = None properly, by returning PixelDensity instead of inches/etc.

> Invalid DPI value 
> ------------------
>
>                 Key: IMAGING-139
>                 URL: https://issues.apache.org/jira/browse/IMAGING-139
>             Project: Commons Imaging
>          Issue Type: Bug
>          Components: Format: JPEG
>    Affects Versions: 0.97
>            Reporter: prabu
>         Attachments: 250dpi.jpg
>
>
> I have following code in my java program
> final String IMAGE_PATH = "c:\\test\\250dpi.jpg";
> byte imageBytes[] = readImageBytes(IMAGE_PATH);
> final ImageInfo imageInfo = Sanselan.getImageInfo(imageBytes);
> final int physicalWidthDpi = imageInfo.getPhysicalWidthDpi();
> final int physicalHeightDpi = imageInfo.getPhysicalHeightDpi();
> System.out.println("physicalWidthDpi:"+physicalWidthDpi);
> When i right click image it showing 250 DPI value,but above program returning DPI value -1.
> Not sure why?Can u please help how to get image correct DPI value.
> Attached image for your reference.



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