PNG to JPG

[chrisaaaaa]

I scanned in a lot of old photos as PNG, I set the dates and GPS with picassa, then discovered what I guess you all know, that is lost when I make JPGs.

I know this has been asked before, and I can see it has a good answer, with a scary amount of 'scripting', deals with date but not GPS etc.

When I do "exiftool.exe -a -u -g1 -s in.png" , the output includes creationTime but not GPS co-ordinates.

Then when I try "exiftool.exe -a -u -g1 -z -all= -tagsFromFile in.png -exif:all  out.jpg" I get :

Code Select Expand

"Warning: No writable tags set from in.png"

So it looks like I need to:
  1 extract date and GPS into "in-date-gps.png"
  2 convert "in-date-gps.png" to "out-date-gps.jpg"
  3 decode name and gps and embed that into "out.jpg"

Sounds easy, but the name encode/decode looks tricky and GPS data is hidden somehow.

Have I missed something obvious, like export all data to XML and then reimport?

Anyone have a bat file that does it all already?

[StarGeek]

My quick test shows that Picasa doesn't save GPS data in PNG files.  PNG files have very poor metadata support in the first place and I believe it technically doesn't support EXIF, where the GPS data is normally stored, though Phil has a non-standard work around for that with ExifTool.  The data is probably saved in Picasa's db and might not be easy to get to in a usable form.

I tried Picasa's "Export as HTML", which has an option to export XML, but it doesn't include the gps data.  There's an option under the tools menu (Tools->Geotag->Export to Google Earth file) but that requires Google Earth, which I don't have installed. 

Some further searches came up with ExportPicasa which can extract some of the data out of a Picasa database, unfortunately not the GPS data, though.

You may have to do it the hard way.

[chrisaaaaa]

Thanks StarGeek,

Not good news, but will avoid me going off on a dead end.

Shame Picassa does that, it is quirky but the best I have found to edit dates and places on photos.

Chris

[StarGeek]

I'd suggest taking a look at GeoSetter.  It uses exiftool to embed the geodata and has some pretty good options for dealing with other metadata.

[Alan Clifford]

Shame Picassa does that, it is quirky but the best I have found to edit dates and places on photos.

Chris

I now use http://fastphototagger.sourceforge.net/ for manually changing metadata stuff.