On Wed, 4 Nov 2015 02:59:00 +0100 Wojciech Mamrak <[email protected]> wrote:
> I am afraid this is the property of dual source blending - your > background must be opaque. If you can't satisfy this condition your > only option is to store the three alpha channels obtained from FT and > blend them with background later, when it is opaque (and eventually it > will be), Then why to compute Da from your equations? If the background, is opaque, then Da will always be 1.0 (255). > or use normal alpha blending (one alpha channel). What you mean here? I am using "normal alpha blending" in the images. Or you mean to use non-pre-multiplied alpha? I can, if it will help. BTW, I tried to create some image with black text on transparent background with sub-pixel antialiasing and I was able to make it with LibreOffice Draw. See the attachment: BlackOnTransparent.png It is not the best quality, but at least does not appears as a black rectangles. -- http://fresh.flatassembler.net http://asm32.info John Found <[email protected]>
BlackOnTransparent.png
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