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

On Mon, Jan 30, 2017 at 4:23 PM, Willem van Schaik <[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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