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From Jan Tošovský <j.tosov...@tiscali.cz>
Subject RE: Portrait rotation
Date Thu, 12 Mar 2009 17:50:22 GMT
Hi Helder, 

thanks for your links, although it is not my case, it helped me to name my problem at least.
I've met there keyword Exif orientation. It seems to me that this info is not read from the
image (like in IrfanView and other tools) so I am getting not rotated output. Is this Exif
info supported? Are even older versions of this specification supported? Image was taken by
5 years old Canon Ixus V3.

Thanks in advance for any feedback.


> > I've tried Batik rasterizer to convert my SVG file with 
> embeded portrait
> > image (taken from rotated digital camera), but resulted 
> JPEG image is
> > without rotation, rasterized as normal landscape image. 
> AFAIK there is no
> > option to switch this on. I am missing something? Now I use 
> another tool for
> > resaving such image, but it affects the final quality. 
> Thank for any ideas.
> Am not sure about the use case here... Do you intend to do a lossless
> JPEG rotation [1] [2] [3]? If that's not the case, to rotate an
> embedded image one can use the transform [4] property set in a
> container element [5]. Sample follows:
> <svg xmlns="http://www.w3.org/2000/svg"
> xmlns:xlink="http://www.w3.org/1999/xlink">
>   <title>image rotation sample</title>
>   <g transform="rotate(-45)">
>     <image x="0" y="0" width="100px" height="100px"
> xlink:href="my100x100image.jpeg">
>   </g>
> Maybe it's me who's missing something -- if none of this was the
> intended idea, please provide more details, maybe accompanied by a
> sample or two, in order to get more valuable feedback.
> Hope this helps,
>  Helder Magalhães
> [1] 
> http://www.ammara.com/support/technologies/lossless-jpeg-rotation.html
> [2] 
> http://graphicssoft.about.com/cs/digitalimaging/f/rotatequality.htm
> [3] http://jpegclub.org/losslessapps.html
> [4] http://www.w3.org/TR/SVG11/coords.html#TransformAttribute
> [5] http://www.w3.org/TR/SVG11/intro.html#TermContainerElement

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