Re: [EXTERNAL] Meeting topics for March 19th, 2023

I don't know a great way to add cICP chunks at the moment.
I manually hex edited the file to add the new chunk.
There is a tool called TweakPNG which is very nice. It doesn't yet know
about the cICP chunk but it is open source so I could add support if you
would like.

On Sun, Mar 19, 2023 at 6:47 PM Seeger, Chris (NBCUniversal) <
Chris.Seeger@nbcuni.com> wrote:

> Hi Chris,
>
>
>
> Can you instruct me tools for adding the CICP chunk to a png file so I can
> make independent tests?
>
>
>
> Best,
>
> Chris Seeger
>
>
>
> *From: *Chris Blume (ProgramMax) <programmax@gmail.com>
> *Date: *Sunday, March 19, 2023 at 3:17 PM
> *To: *public-png@w3.org <public-png@w3.org>
> *Subject: *[EXTERNAL] Meeting topics for March 19th, 2023
>
> Hello everyone,
>
> I apologize for the late email. I had friends visiting this week and lost
> track of time.
>
> Topics for our March 19th meeting:
>
>    - Friday, March 24th is when the PNG patent disclosure period ends.
>    Our next step will be Candidate Recommendation, which requires us to close issues
>    marked blocking-3rd-edition-cr
>    <https://urldefense.com/v3/__https:/github.com/w3c/PNG-spec/issues?q=is*3Aissue*is*3Aopen*label*3Ablocking-3rd-edition-cr__;JSslKyU!!PIZeeW5wscynRQ!pRT_nke26r6RVrORfn4i-PEba9A9T_MjTfbZH3QHOuHEYSpEMkANxzSDFgNcPXLpNY9UEUVqEVL8BF9AZhAo$> and
>    gathering implementation experience.
>
>
>    - We now have 2 WPT tests live
>       <https://urldefense.com/v3/__https:/wpt.fyi/results/png?label=master&label=experimental&aligned&view=subtest&q=png__;!!PIZeeW5wscynRQ!pRT_nke26r6RVrORfn4i-PEba9A9T_MjTfbZH3QHOuHEYSpEMkANxzSDFgNcPXLpNY9UEUVqEVL8BOqHRzeE$>
>       .
>
>
>    - Although, it looks like the cicp test harness is now failing? I'll
>          investigate.
>
>
>    - We have reached to Mozilla
>       <https://urldefense.com/v3/__https:/bugzilla.mozilla.org/show_bug.cgi?id=1821750__;!!PIZeeW5wscynRQ!pRT_nke26r6RVrORfn4i-PEba9A9T_MjTfbZH3QHOuHEYSpEMkANxzSDFgNcPXLpNY9UEUVqEVL8BMjWsXgS$> and
>       libpng
>       <https://urldefense.com/v3/__https:/github.com/glennrp/libpng/issues/471__;!!PIZeeW5wscynRQ!pRT_nke26r6RVrORfn4i-PEba9A9T_MjTfbZH3QHOuHEYSpEMkANxzSDFgNcPXLpNY9UEUVqEVL8BF1z1bPW$>
>       to learn how they want to proceed with implementation.
>
>
>    - Acropalypse was announced.
>    <https://urldefense.com/v3/__https:/twitter.com/ItsSimonTime/status/1636857478263750656__;!!PIZeeW5wscynRQ!pRT_nke26r6RVrORfn4i-PEba9A9T_MjTfbZH3QHOuHEYSpEMkANxzSDFgNcPXLpNY9UEUVqEVL8BNACUwYI$>
>
>
>    - It works via cropping an image so it uses less data. When the newly
>       cropped image is saved, the file isn't truncated down to the smaller size.
>       This means data from the original, uncropped image is still in the file.
>       Using the Huffman table from the cropped image, parts of the uncropped
>       image can be reconstructed. (Or that is my understanding, at least.)
>       - We already have a bug open to warn about data stored after the
>       end of the image
>       <https://urldefense.com/v3/__https:/github.com/w3c/PNG-spec/issues/170__;!!PIZeeW5wscynRQ!pRT_nke26r6RVrORfn4i-PEba9A9T_MjTfbZH3QHOuHEYSpEMkANxzSDFgNcPXLpNY9UEUVqEVL8BG4KcpFB$>
>       .
>       - Should we encourage or require decoders to not display an image
>       with extra data? That might have helped people catch their mistake. But the
>       image is still valid and so not displaying it might be heavy handed.
>
>
>    - The Privacy IG has gotten back to us with suggested changes
>    <https://urldefense.com/v3/__https:/github.com/w3c/PNG-spec/issues/282__;!!PIZeeW5wscynRQ!pRT_nke26r6RVrORfn4i-PEba9A9T_MjTfbZH3QHOuHEYSpEMkANxzSDFgNcPXLpNY9UEUVqEVL8BC0vSUsM$>.
>    Would anyone be interested in mentioning these privacy concerns in the
>    privacy section of the spec?
>
>
> Thanks everyone!
> See you at the meeting tomorrow.
>