Nikon cameras also embed similar info, but I have not dug into it yet. At this point a low priority for me, but I could provide RAW and jpeg files if someone wanted to play with this ;)
On Wed, Jan 4, 2012 at 12:17, Olivier Tilloy <[email protected]> wrote: > On 2011-12-31, Jason Bishop <[email protected]> wrote: >> Hello all, just joined (thanks Olivier) and wanted to share a little bit >> of code with you in case you thought it useful. I got a canon 7d little >> while ago and noticed that the builtin screen indicates with red boxes >> which focus points were used. I thought that was interesting so I went >> trudging through the exif info to see if I could generate images showing >> the focus points as well. this is what i ended up with. grey boxes >> showing all focus points. white for subset which were active when the >> shot was composed, and red for the ones that were used to take the shot. >> please excuse the code duplication, i haven't cleaned up the code yet >> to deal with dcraw rotating the image for me. You can just ignore the >> clauses for rotatepic==true. > > Very interesting, thanks for sharing Jason! > > Could you maybe post somewhere an original picture that embeds such > information? I’m curious to see the visual result, but I don’t own a > Canon camera. > > Also, do you know whether those magic values you use to extract the data > are standard across all Canon cameras, or if they vary from one model to > the other? Did you base your work on some sort of specification, or did > you have to reverse-engineer the data? > >> I was thinking that perhaps these values (focuspointwidth, >> focuspointheight, focuspointxpos, focuspointypos, activeafpoints, >> afpoints) could be exposed more directly. interested in your thoughts. > > It would make sense, especially if the format is common across all Canon > cameras. I’m thinking that it may be a good candidate for an API such as > the one requested in http://pad.lv/724185 > > Cheers, > > Olivier > > _______________________________________________ > Mailing list: https://launchpad.net/~pyexiv2-developers > Post to : [email protected] > Unsubscribe : https://launchpad.net/~pyexiv2-developers > More help : https://help.launchpad.net/ListHelp -- Alex. _______________________________________________ Mailing list: https://launchpad.net/~pyexiv2-developers Post to : [email protected] Unsubscribe : https://launchpad.net/~pyexiv2-developers More help : https://help.launchpad.net/ListHelp
