[Digikam-users] Metadata and jpg quality?
kim.mills at wightman.ca
Tue Feb 19 22:27:57 GMT 2013
Hi Simon, Thank you for testing that out and sharing the results.
Many of the files I'm working with right now, I scanned about 10-12
years ago and no longer have access to the original photos. I did scan
them at 300dpi thankfully. The older photos that I do own, I scan as
both TIFF and JPG. I don't think the scanner I had 10 years ago offered
TIFF's in their software and I know the pc I had back then wouldn't have
had room on it's tiny hard drive for many of them either.
On 02/19/2013 05:15 PM, Simon Cropper wrote:
> Although I was aware that this is the correct answer, I decided to
> test the system - which is easy enough to do.
> Actually editing (even if no changes are made) then saving a JPG image
> 5 or more times (usually less) will show clear changes in image quality.
> I updated a copy of the image's metadata 12 times yet was unable to
> see any introduced artifacts using the light table feature at x1200.
> So as Jean-François rightfully explained only the header section of
> the JPG file is being updated.
> It is worth noting that you can set the preferences so that the
> metadata is saved to XMP files -- a good option if you work with RAW
> files (as the save metadata to RAW files is only an experimental
> I also have worked through my old heirloom photos. Are these scanned
> images or old digital files that were taken in JPG? If you are
> scanning your photos why are you saving as JPGs? Being loosy you are
> introducing artifacts from the get-go.
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