Re: [libpng:feature-requests] #32 Modern compressor
Златовратский Павел <scondo-JGs/[email protected]>
| Newsgroups | gmane.comp.graphics.png.general |
|---|---|
| Message-ID | <[email protected]> |
In fact there are two ways about `EXIF in PNG`: most simple - eXIf chunk. But there is also long way: reimplement EXIF features with PNG. Some features are already implemented (resolution, some dates, gamma, copyright) and some are not applicable (sub-sampling, planar configuration). So software may be `confused` with overdetermined configuration if PNG and EXIF data are both present, but inconsistent. And for me GPS tags in EXIF are very bad, looks like dirty dump from GPS receiver appended with some data in notepad. I tried to develop some better way to specify position and orientation for PNG, if you're interested.... 31.12.2016 8:02, John Bowler пишет: > Ok. In JPEG it's a binary blob contained in an APP marker. There's > lots of code out there to decode the blob simply because, while it is > binary, the format is always well defined. > > It's nominally safe-to-copy; there is some information in there (such > as the modification date) which some might argue isn't, but that is > really moot because 'modification' in the Exif context means a real > change to the image, not the kind of encoding change that things like > pngcrush or OptiPNG do. > > So it's eXIf; just a blob, forget the compression complexity. > Unofficially it would be exIf with, just, the blob as the data. > > John Bowler > > > ------------------------------------------------------------------------------ > Check out the vibrant tech community on one of the world's most > engaging tech sites, SlashDot.org! http://sdm.link/slashdot > > > _______________________________________________ > png-mng-misc mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/png-mng-misc ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, SlashDot.org! http://sdm.link/slashdot _______________________________________________ png-mng-misc mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/png-mng-misc