Re: png files
On Mon, 30 May 2016 11:26:30 +0800
Paul Wise <pabs@debian.org> wrote:
> On Mon, May 30, 2016 at 6:09 AM, Ben Finney wrote:
> > Herbert Fortes (hpfn) writes:
> >
> >> But some .png files are like a chess board with a grey color. There is
> >> nothing in it.
> >>
> >> Since a file to be free must have source that can be editable, is that
> >> a problem ?
> >
> > A consensus definition of “source” in Debian is “the preferred form of
> > the work for making modifications to it”.
>
> ... but there is no consensus within Debian that all files in the
> archive must come with "source". Some folks (including me) do think
> that all files (including images) should have source and others think
> that only programs need source.
>
> > Yes, this requires human judgement, and yes it can be abused. With that
> > said, I think that PNG files containing simple geometric shapes would
> > pretty clearly be their own source form.
>
> Looking at the files in question I see what might be pre-rendered
> multi-layered and vector based images. For such images usually there
> is a more expressive form like SVG or XCF or similar that the images
> were prepared from. If I look at the metadata in the images (see
> below), it is clear that they were created using proprietary Adobe
> products. Both of the products mentioned in the metadata allow
> multi-layer or vector forms in images. So there may be a more
> expressive form available, or the author may have just exported to PNG
> and discarded the more expressive form. If we look at the upstream
> git/svn repositories, there are no more expressive files available.
> The only way to find out if there are more expressive forms still
> existing somewhere would be to contact upstream and or the folks who
> added the files to the upstream VCS repository.
>
> https://en.wikipedia.org/wiki/Adobe_Fireworks
>
> BTW: the Debian package definitely does not have the source for the
> CSS files, if you look at the upstream repo you will see they use
> *.scss files as the source and then generate CSS from them using sass
> and minify them using gulp. bower is also involved somehow. See the
> end of README.txt information about that and bower.json .bowerrc
> gulpfile.js package.json for the build system for this stuff. Note
> that gulp and bower are not yet packaged for Debian so smoviecat won't
> be build-able from source in Debian, which is against ftp-master
> policy.
>
> http://thesassway.com/editorial/sass-vs-scss-which-syntax-is-better
>
> $ dget -qx https://mentors.debian.net/debian/pool/main/s/smoviecat/smoviecat_2.5.0+dfsg-1.dsc
> $ cd smoviecat*/lib
> $ sng *.png
> libpng warning: iCCP: known incorrect sRGB profile
> libpng warning: iCCP: known incorrect sRGB profile
> $ for f in *.sng ; do egrep -H '(name|text):' $f || echo $f no match ; done
> base-shadow.sng: name: "Photoshop ICC profile"
> content-bg.sng: text: "17/4/11";
> content-bg.sng: text: "Adobe Fireworks CS5";
> noposter.sng: text: "07/13/10";
> noposter.sng: text: "Adobe Fireworks CS4";
> posterbg.sng: name: "Photoshop ICC profile"
> posters.sng no match
>
Thanks for the analise and specially the 'BTW'.
regards,
--
Herbert Parentes Fortes Neto (hpfn)
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