Adding edtra EXIF data

[czimm74]

Would be nice to add more exif data into the image file when writing. Similar to how the Label Image Template is. That way you could store all the camera, lens, location, all the image label items in the data of the image. Then can query that information from something like Darkroom or any other image editor.

I have just started looking through the code to see that the temp exif json file is I see during the image capture.

[aaronwmorris]

I can work on this soon.

This is one of the major complaints of the OpenCV library, it does not support writing EXIF data. I need to rip out all of the OpenCV imread/imwrite functionality and replace it with PIL or imageio.

[czimm74]

Just things I think of when I am trying to bre... I mean improve things.

[StarGeezerPhil]

Another thing that'd be interesting to explore would be including EXIF projection, panorama, fov details to enable viewing of fisheye captures within a suitable 360 viewer - or allow software to flatten or otherwise process the images more easily.

I'm not sure of all the details, but know there are some meta/EXIF properties to support some of this.

It's something I was going to look at to do some local processing in PHP after the end of night script. I really should learn some Python and dig into your code Aaron 🤣

[aaronwmorris]

I am currently replacing all of the OpenCV imread/imwrite functions with Pillow in order to support EXIF.

The side benefit is Pillow appears to be faster by at least 50%. Actions that perform a lot of image reads and writes like generating keograms and startrails, which can take 10-15 minutes, can save as much as 60s of run time.

[aaronwmorris]

Bleh... Building exif data [in python] is more difficult than I thought it would be.

[czimm74]

Been doing some looking into it myself. No one seems to have a clean way of doing it easily. I wonder if running it post process, query the data from the sqllite data would be easier.

[aaronwmorris]

I finally figured out the piexif module. The module itself is effectively abandoned, but will still work for my purposes.

[aaronwmorris]

I have merged #710 which includes EXIF metadata for all JPEG images. I have tried to include as much detail as possible, including geolocation GPS tags and copyright information (if defined). I have not done anything with PNG metadata, as that does not appear to be well standardized.

Most of the image I/O has been replaced with Pillow, which improves image performance by 25-50%. Generating Keograms and Star Trails should be about 5-10% faster.

[czimm74]

ok, will run an update and see what I can blow up ;)

[czimm74]

Only works is the logo overlay is blank, will check if exif data is being written soon

[aaronwmorris]

I have merged #716 with a fix for the logo mask.

[czimm74]

Ok, looks like it is writing exif data. Will update and try your logo fix next

[czimm74]

Looks like you fixed the logo overlay. No errors being thrown.

[aaronwmorris]

When I was using OpenCV to write images, it did not really care of the data was represented as integers or floats, it would automatically correct for it. However, Pillow is really picky about the data being 8-bit unsigned ints.