Bug#1115339: explain `-rem alla` and `-rem allb` in the help and in the man pages

[xiao sheng wen(肖盛文)]

Control: severity -1 wishlist
Control: found -1 1.8.13-2

Hi,

Please use:

pngcrush -v --help

to get more information.

We may update the manual pages, use the output of "pngcrush -v --help".


在 2025/9/16 02:50, Peter Müller 写道:
> Package: pngcrush
> Version: 1.8.13-2~exp1
> 
> 
> The documentation leaves a small but rather curious gap: neither the manual pages (`man pngcrush`) nor the built-in help (`pngcrush --help`) explain what the mysterious arguments `alla` and `allb` mean when passed to the `-rem` option.
> 
> Examples:
>     pngcrush -rem alla input.png output.png
>     pngcrush -rem allb input.png output.png
> 
> Currently, the only way to discover their meaning seems to be consulting the Internet, or worse, reading the source code. It would be wonderful if users could instead learn this from the locally installed documentation, as with other options.
> 
> I do know an *Alla*, but I'm quite sure she wouldn't appreciate being removed from a PNG file. As for *Allb*, I've never met them, except, perhaps, an overweight Al(ex) heavy on lb . :-)
> 
> Gratefully,
> Peter
> 

Regards,
-- 
肖盛文 xiao sheng wen -- Debian Developer(atzlinux)
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