Non transparent PNGs

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   Hello,

if I use png pictures with only 3 channels (rgb), is it possible that this pictures are always invisible?
I wondering about following code in CXTPGraphicBitmapPng::ConvertToBitmap:

        for (xImg = 0; xImg < szImage.cx; xImg++)
        {
            r = *src++;
            g = *src++;
            b = *src++;
            *dst++ = b;
            *dst++ = g;
            *dst++ = r;
            a = 0;

            if (cImgChannels == 4)
            {
                a = *src++;
            }
            *dst++ = a;
        }

0 is treated as "fully transparent", is that right?
Should this value not be 255 (0xFF)?

Michael