Colin, the only problem I see in this method is that most of Shotwell's 
transformations (color correction, straighten, red-eye) are not stored as 
metadata in the file, so those won't be converted.  Orientation (i.e. rotation) 
will if you have metadata writing turned on (which will also store tags in the 
metadata).

Otherwise, I think the technique you describe will work just fine.

-- Jim

On Thu, Dec 6, 2012 at 5:59 AM, Colin Law <[email protected]> wrote:
I have a large number of png files imported into Shotwell and tagged, 
with the metadata being written to the files. The png files are 
typically 10MB and I find that if I convert them to jpg the size 
reduces to around 1.5MB with no discernible reduction in quality. In 
retrospect I would of course have been better to convert before 
importing and tagging but it is too late for that now. 

Following experimentation it appears that if I convert each file to 
jpg in the Shotwell pictures directories (using imagemagick, which 
appears to retain the metadata) then when I start Shotwell (with Watch 
for New Files set) then it automatically imports the jpg files and 
correctly picks up the tags from the metadata in the image. If I then 
delete the original images I guess they should be moved to Missing 
Files from where I can remove them from the library. Can anyone see 
any problems with this? Perhaps there is a better way. 

Colin 
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