Path: csiph.com!fu-berlin.de!uni-berlin.de!individual.net!not-for-mail From: Jolly Roger Newsgroups: comp.sys.mac.apps Subject: Re: Graphic Converter Date: 24 Apr 2016 15:31:59 GMT Lines: 36 Message-ID: References: <0001HW.D34164FD0772F83AB02919BF@news.astraweb.com> <0001HW.D3421D1D079E1F59B02919BF@news.astraweb.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Trace: individual.net BGHIrM1b+CEguvdGfaQKCQwDCYwNhmnq5DuHXt0YLIc/7H/5t+ Cancel-Lock: sha1:a5EWl7B5dHlwvUyZJeheec7lhh4= sha1:JnyLrIBLfTcouoIdjvuILUR91zc= User-Agent: NewsTap/5.1.8 (iPhone/iPod Touch) Xref: csiph.com comp.sys.mac.apps:35385 Nelson wrote: > On Sat, 23 Apr 2016 23:21:16 -0400, Jolly Roger wrote > (in article ): > >> Nelson 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. -- E-mail sent to this address may be devoured by my ravenous SPAM filter. I often ignore posts from Google. Use a real news client instead. JR