Re: EXIF support in PNG - PngSuite image with EXIF chunk
Willem van Schaik <[email protected]>
| Newsgroups | gmane.comp.graphics.png.general |
|---|---|
| Message-ID | <[email protected]> |
Mmm, tough call ... Doesn't sound all logical, but maybe with a night sleep? :-) Willem On 2017-01-30 16:18, Glenn Randers-Pehrson wrote: > ImageMagick is reporting correctly. It needs the "Exif00" so the decoder > injects it back in again while reading the chunk. It's in the *profile* > not in > the exIf chunk. > > Glenn > > On Mon, Jan 30, 2017 at 4:59 PM, Willem van Schaik <[email protected] > <mailto:[email protected]>> wrote: > > > looks pretty OK, however ... > > when the exif chunk still started with "Exif\0\0" the length of the > chunk was 984 bytes, but after taking out that header the length is now > 978 bytes > > but ImageMagick does report 984, so either there is something wrong with > my file, or IM is reporting wrong > > we better figure this out :) > > Willem > > > On 2017-01-30 15:10, Glenn Randers-Pehrson wrote: > > On Mon, Jan 30, 2017 at 4:23 PM, Willem van Schaik <[email protected] <mailto:[email protected]> > > <mailto:[email protected] <mailto:[email protected]>>> wrote: > > > > > > has anybody been able to run these two images through their (png > > reading) software to verify that these contain valid exif chunks? > > > > > > Here's the output of ImageMagick's "identify -verbose exif2c08.png > > exif3p08.png": > > > > Image: exif2c08.png > > Format: PNG (Portable Network Graphics) > > Type: Palette > > Properties: > > date:create: 2017-01-30T16:59:38-05:00 > > date:modify: 2017-01-30T16:58:06-05:00 > > exif:ColorSpace: 65535 > > exif:ComponentsConfiguration: 1, 2, 3, 0 > > exif:Copyright: 2017 Willem van Schaik > > exif:ExifOffset: 138 > > exif:ExifVersion: 48, 50, 50, 48 > > exif:FlashPixVersion: 48, 49, 48, 48 > > exif:Orientation: 1 > > exif:ResolutionUnit: 2 > > exif:thumbnail:Compression: 6 > > exif:thumbnail:JPEGInterchangeFormat: 314 > > exif:thumbnail:JPEGInterchangeFormatLength: 663 > > exif:thumbnail:ResolutionUnit: 2 > > exif:thumbnail:XResolution: 72/1 > > exif:thumbnail:YResolution: 72/1 > > exif:UserComment: 65, 83, 67, 73, 73, 0, 0, 0, 80, 110, 103, 83, > > 117, 105, 116, 101 > > exif:XResolution: 72/1 > > exif:YCbCrPositioning: 1 > > exif:YResolution: 72/1 > > png:IHDR.bit-depth-orig: 8 > > png:IHDR.bit_depth: 8 > > png:IHDR.color-type-orig: 2 > > png:IHDR.color_type: 2 (Truecolor) > > png:IHDR.interlace_method: 0 (Not interlaced) > > png:IHDR.width,height: 32, 32 > > png:sRGB: intent=0 (Perceptual Intent) > > signature: > > 783704a680ad00e885dc84076dc26dfa3159c376798f2644afa4aa6a47f2c0cb > > Profiles: > > Profile-exif: 984 bytes > > Version: ImageMagick 7.0.4-6 Q16 x86_64 2017-01-28 > > http://www.imagemagick.org > > Image: exif3p08.png > > Format: PNG (Portable Network Graphics) > > Type: Palette > > Properties: > > date:create: 2017-01-30T16:59:38-05:00 > > date:modify: 2017-01-30T16:58:26-05:00 > > exif:ColorSpace: 65535 > > exif:ComponentsConfiguration: 1, 2, 3, 0 > > exif:Copyright: 2017 Willem van Schaik > > exif:ExifOffset: 138 > > exif:ExifVersion: 48, 50, 50, 48 > > exif:FlashPixVersion: 48, 49, 48, 48 > > exif:Orientation: 1 > > exif:ResolutionUnit: 2 > > exif:thumbnail:Compression: 6 > > exif:thumbnail:JPEGInterchangeFormat: 314 > > exif:thumbnail:JPEGInterchangeFormatLength: 663 > > exif:thumbnail:ResolutionUnit: 2 > > exif:thumbnail:XResolution: 72/1 > > exif:thumbnail:YResolution: 72/1 > > exif:UserComment: 65, 83, 67, 73, 73, 0, 0, 0, 80, 110, 103, 83, > > 117, 105, 116, 101 > > exif:XResolution: 72/1 > > exif:YCbCrPositioning: 1 > > exif:YResolution: 72/1 > > png:IHDR.bit-depth-orig: 8 > > png:IHDR.bit_depth: 8 > > png:IHDR.color-type-orig: 3 > > png:IHDR.color_type: 3 (Indexed) > > png:IHDR.interlace_method: 0 (Not interlaced) > > png:IHDR.width,height: 32, 32 > > png:PLTE.number_colors: 134 > > png:sRGB: intent=0 (Perceptual Intent) > > signature: > > e4818fcc46a06587c1ba53cf753e938ce6ae63a116946a8a5fe7a20741d61d9e > > Profiles: > > Profile-exif: 984 bytes > > > > glenn.rp> > > > > > > > > > > > > ------------------------------------------------------------------------------ > > 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] > <mailto:[email protected]> > > https://lists.sourceforge.net/lists/listinfo/png-mng-misc > <https://lists.sourceforge.net/lists/listinfo/png-mng-misc> > > > > -- > Willem van Schaik > [email protected] <mailto:[email protected]> > > ------------------------------------------------------------------------------ > 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] > <mailto:[email protected]> > https://lists.sourceforge.net/lists/listinfo/png-mng-misc > <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 > -- Willem van Schaik [email protected] ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, SlashDot.org! http://sdm.link/slashdot