Requested DNG orientation

[gab]

Hello!

The .DNG orientation tag is not used by the IrfanView, so the pictures with the portrait orientation are shown incorrectly.
It would be nice if the IrfanView could show the DNG correctly

Accrording the .DNG specification,
http://www.adobe.com/products/dng/pdfs/dng_spec.pdf, the .dng is an extension to the TIFF 6.0 format , but the TIFF orientation flag is mandatory.

Here is what the spec says.

Orientation is a required tag for DNG. With the Orientation tag present, file browsers can perform lossless rotation of DNG files by modifying a single byte of the file.
DNG readers should support all possible orientations, including mirrored orientations. Note that the mirrored orientations are not allowed by the TIFF-EP specification, so writers should not use them if they want their files be compatible with both specifications.


Thank you in advance,
Gabriel

[gab]

One interesting observation.
If I rename the .dng to .tif, the IrfanView shows the correct orientation , but the image size is reduced .
(Perhaps it takes some embedded preview ?)

If you wish, I can send you some samples from my camera.
(They are 16 Mb each, though )