Already assuming that you know which pixel you wish to modify, (like if you want to modify pixel 25 in pixel row 3, that would be pixel 75.. I think..) you would need to do something like the following..
--first, put the current alphadata into a variable. put the alphadata of img "myImg" into tAlpha -- then modify the alphadata for the pixel in question put numtochar(0) into char 75 of tAlpha -- 0 is transparent, 255 is completely opaque -- change all necessary pixels here then -- set the image to the new alphadata set the alphadata of img "myImg" to tAlpha On Wed, May 9, 2018 at 11:59 AM, jbv via use-livecode < use-livecode@lists.runrev.com> wrote: > On Wed, May 9, 2018 7:51 pm, Richmond Mathewson via use-livecode wrote: > > The inevitable question has to be why you are doing that in such a > > fiddly sort of way. > > > > Richmond. > > > > It would be too long to explain, but in short some users of a client > app will modify pixels of images that will then be exported as PNG to > a server and then displayed in a website. > I have successfully modified the alpha channel of images with php for > years, and am just wondering why this doesn't work in LC... > > > _______________________________________________ > use-livecode mailing list > use-livecode@lists.runrev.com > Please visit this url to subscribe, unsubscribe and manage your > subscription preferences: > http://lists.runrev.com/mailman/listinfo/use-livecode > _______________________________________________ use-livecode mailing list use-livecode@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-livecode
