Discovering libraw plugin integration in oiio and found that oiio plugin do
not provide access to such a quite critical feature as image orientation
and only related to automatic exif orientation detection.
Available raw:user_flip
Set libraw user flip value : -1 ignored, other values are between [0; 8]
with the same definition than the Exif orientation code.
do not rotate but flip image.
If i understand correctly but Libraw provide access to image orientation
via LibRaw::open_bayer
LibRaw::open_bayer call allows to pass sensor dump w/o metadata directly to
LibRaw:
virtual int open_bayer(unsigned char *data, unsigned datalen,
ushort _raw_width, ushort _raw_height, ushort _left_margin, ushort
_top_margin,
ushort _right_margin, ushort _bottom_margin,
unsigned char procflags, unsigned char bayer_pattern, unsigned
unused_bits, unsigned otherflags,
unsigned black_level);
...
...
otherflags:
Bit 1 - filter (average neighbors) for pixels with values of zero
Bits 2-4 - the orientation of the image (0=do not rotate, 3=180,
5=90CCW, 6=90CW)
black_level: file black level (it also may be specified via
imgdata.params)
Any chance to have raw:orientation identical to EXIF support in Oiio RAW
plugin?
Best regards
Vlad
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