please add crw tag "JpgFromRaw" support to get bigger preview image for cr3 image

[wbzqe]

please add crw tag "JpgFromRaw" support to get bigger preview image for cr3 image

exiv2 process crw tag ThumbnailImage 0x2008

according to exiftool, the tagid of the full size preview image for CRW is 0x2007 canon_raw

Thank you very much for your help

[kmilos]

exiv2 -pp and exiv2 -ep can already extract the 0x2007 preview via these Exif.Image2 tags and is thus exposed through the standard preview API. Does that cover your needs?

[wbzqe]

@kmilos Thank you very much for your reply, but I found that my CR3 file cannot read the preview image "0x2007" of CRW decoder because CR3 uses BMFF decoder parseCr3Preview only get small size of preview image (usually 1620 * 1080)

[kmilos]

Ok, so nothing to do w/ CRW actually... You want the full size JPEG from CR3 mdat: https://github.com/lclevy/canon_cr3

Currently only THMB and PRVW are read.