Re: Unofficial pngcheck with cICP support

On Wed, Jan 15, 2025 at 3:16 PM Chris Lilley <chris@w3.org> wrote:

>
> On 2025-01-08 15:17, Chris Lilley wrote:
>
> I forked a copy of the latest (3.0.3) pngcheck onto GitHub [1]. I then
> hacked in some cICP support [2].
>
> I have now added mDCV [3] and cLLI [4] support. There are some checks for
> invalid values, and also an error if the old mDCv or cLLi are found.
>
Looks good; I verified it against the current canonical PNG, pngtest.png,
and apart from one issue (which I raised) it covers the colourspace part of
PNGv3.

@chrisb I suggest that it would be appropriate to add pngtest to
https://github.com/pnggroup  It has always been the authoritative PNG check
program.  Since both you and the current (so far as I can determine)
maintainer of pngcheck are there this seems like it should be something
doable and it is certainly desirable.

John Bowler

>