#4 Support piping from/to stdin/stdout

[blotch]

Please add support for piping like

pngoutput.exe | optipng - out.png

None of the png optimizers support this

[Matthew]

For what it's worth, actually pngout uses stdin/out if you give "-" as the relevant filename, e.g.
pngout - - < file1.png > file2.png

[Nobody/Anonymous]

Thanks for the tip!

[Cosmin Truta]

Hi,
Thanks for the suggestion. I will put this on the to-do list. It will probably not be done by the next release, and, if done, it will incur an overhead due to an extra image read/write operation (that is not done during processing of regular files); I cannot guarantee it, but I will at least look at it.

Best regards,
Cosmin

[Sindre Sorhus]

Any updates on this?

We need this for https://github.com/kevva/image-min so we can make it fully streaming.

[Cosmin Truta]

In OptiPNG-Hg there is currently the option -stdout, but no support for stdin yet.

[NRK]

I suppose this is still not implemented? Unfortunate. I wanted to be able to optimize my screenshots before stuffing them into the clipboard. Something like:

$ maim -s | optipng | xclip -selection clipboard -t image/png