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A new PNG spec

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618 points bluedel | 1 comments | 24 Jun 25 13:01 UTC | HN request time: 0s | source
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qwertox ◴[25 Jun 25 05:19 UTC] No.44373847[source]▶
> Officially supports Exif data

Probably the best news here. While you already can write custom data into a header, having Exif is good.

BTW: Does Exif have a magnetometer (rotation) and acceleration (gravity) field? I often wonder about why Google isn't saving this information in the images which the camera app saves. It could help so much with post-processing, like with leveling the horizon or creating panoramas.

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1. joshvm ◴[25 Jun 25 23:18 UTC] No.44382700[source]▶
There is an acceleration field (Exif.Photo.Acceleration) and (Exif.Photo.CameraElevationAngle) for elevation but oddly not 3 axes. Similarly there are fields for ambient environmental conditions, but only whatever specific things the spec-writers considered.

You could store this in Exif.Photo.MakerNote: "A tag for manufacturers of Exif writers to record any desired information. The contents are up to the manufacturer." I think it can be pretty big, certainly more than enough for 9 DoF position data.