Re: CALL for DISCUSSION: eXIf 20170115

Thanks.  I suppose it's equivalent to what I'm already doing; I'll stick
with the zpipe.c code instead because it's PD.

On Tue, Jan 24, 2017 at 4:50 PM, Willem van Schaik <[email protected]>
wrote:

>
> I was looking into the zlib code yesterday and looked into example.c
>
> that one is including enflate/deflate from/to memory
>
> does this help?
>
> Willem
>
>
> On 2017-01-24 14:31, GLENN PEHRSON wrote:
> >
> >> On January 24, 2017 at 2:24 PM John Bowler <
> [email protected]> wrote:
> >> I can only conclude that Glenn hasn't
> >> actually implemented anything.
> >>
> >> The issue with zpipe, on both the compress and decompress side, is
> >> that it *writes* the output to a *stream*.  This doesn't work because
> >> on both read and write the length has to be known *before* the
> >> operation starts.  The result of changing it to make this happen is
> >> more than 50 lines.
> >
> > Obviously I had to work around the *stream* problem.
> >
> > I'm not ready to release the code due to other pressing issues
> > today.  Attached is the log from an imagemagick decoding of
> > a "zxIf"-containing demo file
> > from http://www.simplesystems.org/users/glennrp/eXIf/willem
> >
> > Script started on Tue 24 Jan 2017 04:13:20 PM EST
> > glenn.rp> pngcheck -v *zxIf.png
> > File: exif2c08_zxIf.png (2872 bytes)
> >   chunk IHDR at offset 0x0000c, length 13
> >     32 x 32 image, 24-bit RGB, non-interlaced
> >   chunk zxIf at offset 0x00025, length 623
> >     unknown private, ancillary, safe-to-copy chunk
> >   chunk IDAT at offset 0x002a0, length 2180
> >     zlib: deflated, 4K window, maximum compression
> >   chunk IEND at offset 0x00b30, length 0
> > No errors detected in exif2c08_zxIf.png (4 chunks, 6.5% compression).
> > glenn.rp> im identify -verbose -debug coder -log %e exif2c08_zxIf.png
> > Enter ReadPNGImage()
> >   Enter ReadOnePNGImage()
> >     IM version     = 7.0.4-5
> >     Libpng version = 1.2.54
> >     Zlib version   = 1.2.8
> >     Before reading:
> >       image->alpha_trait=0      image->rendering_intent=2
> >       image->colorspace=23
> >       image->gamma=0.454545
> >     read_user_chunk: found zxIf chunk
> >      recognized uxIf|zxIf chunk
> >      initialized uxIf|zxIf chunk
> >      chunk->data[0]=0
> >     PNG width: 32, height: 32
> >     PNG color_type: 2, bit_depth: 8
> >     PNG compression_method: 0
> >     PNG interlace_method: 0, filter_method: 0
> >     Setting sRGB as if in input
> >     image->colorspace=23
> >     Reading PNG IDAT chunk(s)
> >     Converting PNG pixels to pixel packets
> >     Looking for cheap transparent pixel
> >     No transparent pixel was found
> >   image->storage_class=1
> >   exit ReadOnePNGImage()
> >   page.w: 0, page.h: 0,page.x: 0, page.y: 0.
> >   image->colorspace: 23
> > exit ReadPNGImage()
> > Image: exif2c08_zxIf.png
> >   Format: PNG (Portable Network Graphics)
> >   Mime type: image/png
> >   Class: DirectClass
> >   Geometry: 32x32+0+0
> >   Resolution: 72x72
> >   Print size: 0.444444x0.444444
> >   Units: PixelsPerInch
> >   Type: TrueColor
> >   Endianess: Undefined
> >   Colorspace: sRGB
> >   Depth: 8-bit
> >   Channel depth:
> >     Red: 8-bit
> >     Green: 8-bit
> >     Blue: 8-bit
> >   Channel statistics:
> >     Pixels: 1024
> >     Red:
> >       min: 97 (0.380392)
> >       max: 255 (1)
> >       mean: 212.585 (0.833667)
> >       standard deviation: 45.6924 (0.179186)
> >       kurtosis: -0.528099
> >       skewness: -0.917738
> >       entropy: 0.863823
> >     Green:
> >       min: 184 (0.721569)
> >       max: 255 (1)
> >       mean: 235.059 (0.921798)
> >       standard deviation: 20.684 (0.0811136)
> >       kurtosis: -0.840804
> >       skewness: -0.729286
> >       entropy: 0.845184
> >     Blue:
> >       min: 66 (0.258824)
> >       max: 167 (0.654902)
> >       mean: 118.676 (0.465395)
> >       standard deviation: 15.3684 (0.0602683)
> >       kurtosis: 0.275875
> >       skewness: 0.0264405
> >       entropy: 0.919218
> >   Image statistics:
> >     Overall:
> >       min: 66 (0.258824)
> >       max: 255 (1)
> >       mean: 188.773 (0.740287)
> >       standard deviation: 30.2865 (0.11877)
> >       kurtosis: 16.972
> >       skewness: -2.00134
> >       entropy: 0.876075
> >   Colors: 958
> >   Histogram:
> >          1: ( 97,215,121) #61D779 srgb(97,215,121)
> >   [...]
> >          1: (255,255,145) #FFFF91 srgb(255,255,145)
> >   Rendering intent: Perceptual
> >   Gamma: 0.454545
> >   Chromaticity:
> >     red primary: (0.64,0.33)
> >     green primary: (0.3,0.6)
> >     blue primary: (0.15,0.06)
> >     white point: (0.3127,0.329)
> >   Alpha color: grey74
> >   Background color: white
> >   Border color: srgb(223,223,223)
> >   Transparent color: none
> >   Interlace: None
> >   Intensity: Undefined
> >   Compose: Over
> >   Page geometry: 32x32+0+0
> >   Dispose: Undefined
> >   Iterations: 0
> >   Compression: Zip
> >   Orientation: TopLeft
> >   Properties:
> >     date:create: 2017-01-23T23:53:44-05:00
> >     date:modify: 2017-01-23T23:53:44-05:00
> >     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: c22dc7f8430b1f787047f2dc4b77fa
> f136ae54956ddb5912b29c1d937f5b315c
> >   Profiles:
> >     Profile-exif: 629 bytes
> > exif(629): 0x00000000: 78696600 004d4d00 2a000000 08000701 12000300
> Exif--MM-*----------
> > 0x00000190: 00000100 01000001 1a000500 00000100 00006201
> -------------------b
> > 0x00000320: 1b000500 00000100 00006a01 28000300 00000100
> -----------j-(------
> > 0x000004b0: 02000002 13000300 00000100 01000082 98000200
> --------------------
> > 0x00000640: 00001700 00007287 69000400 00000100 00008a00
> -------r-i----------
> > 0x000007d0: 0000dc00 00004800 00000100 00004800 00000132
> -------H-------H----
> > 0x00000960: 30313720 57696c6c 656d2076 616e2053 63686169  2017 Willem
> van Scha
> > 0x00000af0: 6b000000 05900000 07000000 04303232 30910100
> ik------------0220--
> > 0x00000c80: 07000000 04010203 00928600 07000000 10000000
> --------------------
> > 0x00000e10: cca00000 07000000 04303130 30a00100 03000000
> ----------0100------
> > 0x00000fa0: 01ffff00 00000000 00415343 49490000 00506e67
> ----------ASCII---Pn
> > 0x00001130: 53756974 65000601 03000300 00000100 06000001
> gSuite--------------
> > 0x000012c0: 1a000500 00000100 00012a01 1b000500 00000100
> -----------*--------
> > 0x00001450: 00013201 28000300 00000100 02000002 01000400
> ---2-(--------------
> > 0x000015e0: 00000100 00013a02 02000400 00000100 00029700
> -------:------------
> > 0x00001770: 00000000 00004800 00000100 00004800 000001ff
> -------H-------H----
> > 0x00001900: d8ffe000 104a4649 46000101 00000100 010000ff
> ------JFIF----------
> > 0x00001a90: db004300 03020203 02020303 03030403 03040508
> ---C----------------
> > 0x00001c20: 05050404 050a0707 06080c0a 0c0c0b0a 0b0b0d0e
> --------------------
> > 0x00001db0: 12100d0e 110e0b0b 10161011 13141515 150c0f17
> --------------------
> > 0x00001f40: 18161418 12141514 ffdb0043 01030404 05040509
> ------------C-------
> > 0x000020d0: 05050914 0d0b0d14 14141414 14141414 14141414
> --------------------
> > 0x00002260: 14141414 14141414 14141414 14141414 14141414
> --------------------
> > 0x000023f0: 14141414 14141414 14141414 14141414 14ffc000
> --------------------
> > 0x00002580: 11080008 00080301 22000211 01031101 ffc4001f
> ---------"----------
> > 0x00002710: 00000105 01010101 01010000 00000000 00000102
> --------------------
> > 0x000028a0: 03040506 0708090a 0bffc400 b5100002 01030302
> --------------------
> > 0x00002a30: 04030505 04040000 017d0102 03000411 05122131
> ----------}--------!
> > 0x00002bc0: 41061351 61072271 14328191 a1082342 b1c11552
> 1A--Qa-"q-2----#B---
> > 0x00002d50: d1f02433 62728209 0a161718 191a2526 2728292a
> R--$3br--------%&'()
> > 0x00002ee0: 34353637 38393a43 44454647 48494a53 54555657
> *456789:CDEFGHIJSTUV
> > 0x00003070: 58595a63 64656600 00                          WXYZcdef-
> >   Artifacts:
> >     verbose: true
> >   Tainted: False
> >   Filesize: 2.87KB
> >   Number pixels: 1.02K
> >   Pixels per second: 51.2KB
> >   User time: 0.000u
> >   Elapsed time: 0:01.019
> >   Version: ImageMagick 7.0.4-5 Q16 x86_64 2017-01-22
> http://www.imagemagick.org
> > glenn.rp> pngcheck -v *xiIf_im.png File: exif2c08_zxiIf_im.png (4217
> bytes)
> >   chunk IHDR at offset 0x0000c, length 13
> >     32 x 32 image, 24-bit RGB, non-interlaced
> >   chunk cHRM at offset 0x00025, length 32
> >     White x = 0.3127 y = 0.329,  Red x = 0.64 y = 0.33
> >     Green x = 0.3 y = 0.6,  Blue x = 0.15 y = 0.06
> >   chunk bKGD at offset 0x00051, length 6
> >     red = 0x00ff, green = 0x00ff, blue = 0x00ff
> >   chunk pHYs at offset 0x00063, length 9: 2834x2834 pixels/meter (72 dpi)
> >   chunk zTXt at offset 0x00078, length 490, keyword: Raw profile type
> exif
> >   chunk IDAT at offset 0x0026e, length 2180
> >     zlib: deflated, 4K window, maximum compression
> >   chunk exIf at offset 0x00afe, length 623
> >     unknown private, ancillary, safe-to-copy chunk
> >   chunk tEXt at offset 0x00d79, length 37, keyword: date:create
> >   chunk tEXt at offset 0x00daa, length 37, keyword: date:modify
> >   chunk tEXt at offset 0x00ddb, length 21, keyword: exif:ColorSpace
> >   chunk tEXt at offset 0x00dfc, length 39, keyword:
> exif:ComponentsConfiguration
> >   chunk tEXt at offset 0x00e2f, length 37, keyword: exif:Copyright
> >   chunk tEXt at offset 0x00e60, length 19, keyword: exif:ExifOffset
> >   chunk tEXt at offset 0x00e7f, length 31, keyword: exif:ExifVersion
> >   chunk tEXt at offset 0x00eaa, length 35, keyword: exif:FlashPixVersion
> >   chunk tEXt at offset 0x00ed9, length 28, keyword:
> exif:thumbnail:Compression
> >   chunk tEXt at offset 0x00f01, length 40, keyword: exif:thumbnail:
> JPEGInterchangeFormat
> >   chunk tEXt at offset 0x00f35, length 46, keyword: exif:thumbnail:
> JPEGInterchangeFormatLength
> >   chunk tEXt at offset 0x00f6f, length 31, keyword:
> exif:thumbnail:ResolutionUnit
> >   chunk tEXt at offset 0x00f9a, length 31, keyword:
> exif:thumbnail:XResolution
> >   chunk tEXt at offset 0x00fc5, length 31, keyword:
> exif:thumbnail:YResolution
> >   chunk tEXt at offset 0x00ff0, length 82, keyword: exif:UserComment
> >   chunk tEXt at offset 0x0104e, length 23, keyword: exif:YCbCrPositioning
> >   chunk IEND at offset 0x01071, length 0
> > No errors detected in exif2c08_zxiIf_im.png (24 chunks, -37.3%
> compression).
> > glenn.rp> exit
> > exit
> >
> > Script done on Tue 24 Jan 2017 04:15:45 PM EST
> >
> >
> >
> > ------------------------------------------------------------
> ------------------
> > 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
> _______________________________________________
> 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