Re: EXIF support in PNG - PngSuite image with EXIF chunk

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]>> 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>
>
>
>
>
>
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-- 
Willem van Schaik
[email protected]

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