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Groups > comp.sys.mac.apps > #35385

Re: Graphic Converter

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Nelson <nelson@nowhere.com> wrote:
> On Sat, 23 Apr 2016 23:21:16 -0400, Jolly Roger wrote
> (in article <do2sdcFph4gU1@mid.individual.net>):
> 
>> Nelson <nelson@nowhere.com> wrote:
>>> On Sat, 23 Apr 2016 12:51:56 -0400, Király wrote
>>> 
>>> Extract the alpha channel to a new window.  Select that window and 
>>> change colors to 16 bit.  Invert.  Make black transparent.  Save as a 
>>> new png.
>> 
>> Picture > Invert > Normal seems way simpler. Try it out. It works great
>> here.
> 
> Yeah, that didn't work for me with the first example I tried.  I'm not 
> sure why.  I may have had the white point set wrong or the color bit 
> depth wrong or the transparency options wrong, or some other nonsense.  
> Anyway,  I just tried again and it works as you say.

Interesting...

> I'm not sure how transparency is implemented but it apparently requires 
> an Alpha channel and the simple inversion didn't work for me in some 
> cases.  Maybe it depends on the original color that was made 
> transparent.  The sample I made to test was black text on transparent 
> background to start with.
> 
> I don't have the time or interest to figure it out :)

Sounds like a plausible theory, anyway.

-- 
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I often ignore posts from Google. Use a real news client instead.

JR

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Thread

Graphic Converter me@home.spamsucks.ca (Király) - 2016-04-23 16:51 +0000
  Re: Graphic Converter Jolly Roger <jollyroger@pobox.com> - 2016-04-23 19:53 +0000
  Re: Graphic Converter Nelson <nelson@nowhere.com> - 2016-04-23 17:44 -0400
    Re: Graphic Converter Jolly Roger <jollyroger@pobox.com> - 2016-04-24 03:21 +0000
      Re: Graphic Converter Nelson <nelson@nowhere.com> - 2016-04-24 06:50 -0400
        Re: Graphic Converter Jolly Roger <jollyroger@pobox.com> - 2016-04-24 15:31 +0000
        Re: Graphic Converter me@home.spamsucks.ca (Király) - 2016-04-25 03:52 +0000
          Re: Graphic Converter Jolly Roger <jollyroger@pobox.com> - 2016-04-25 16:32 +0000
            Re: Graphic Converter Nelson <nelson@nowhere.com> - 2016-04-26 07:26 -0400

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