marvel@cheops.cis.ohio-state.edu (Howard P Marvel) (07/15/89)
I have had a strange problem with HyperCard graphics. I am pasting pictures, generally from the clipboard, onto backgrounds that have art and fields. Once I position the information, I select "Opaque" from the Paint menu, obtaining the desired effect. The problem is that the effect is not permanent. A copy-card, paste card sequence leads to the new card layer being transparent, and going back to the original card finds that card's card layer transparent as well. This has happened to me numerous times when using either an SE or a CX. Needless to say, it is a major irritant. I'm using the latest system, 6.0.3, and HyperCard 1.2.2. Am I doing something wrong? If not, is this a known bug, and is there a workaround? I know that this does not always happen, and I am apparently leaving out a step that leads to the problem, as I cannot always duplicate the problem, but I'd sure appreciate some help in avoiding it in the future.
jdevoto@Apple.COM (Jeanne A. E. DeVoto) (07/16/89)
In article <54926@tut.cis.ohio-state.edu> Howard P Marvel <marvel@cis.ohio-state.edu> writes: > >I have had a strange problem with HyperCard graphics. I am pasting >pictures, generally from the clipboard, onto backgrounds that have art >and fields. Once I position the information, I select "Opaque" from >the Paint menu, obtaining the desired effect. The problem is that the >effect is not permanent. A copy-card, paste card sequence leads to >the new card layer being transparent, and going back to the original >card finds that card's card layer transparent as well. I have seen similar things happen in some of my own stacks. I believe what is happening is that HyperCard checks the card picture to see whether any opaque pixels cover a black pixel in the background graphic. If not, HyperCard will turn the card picture transparent, since doing so will not change the appearance of the card. The problem is that, apparently, the check is only made for black pixels in the background graphic, not for black pixels in background fields and buttons. This means that an opaque area that was covering up a button can be changed to transparent, letting the button show through. Since Hyp[erCard appears to only make this change when the entire card can be made transparent without showing a background black pixel, it can be worked around by making certain that there is always a black pixel in the background graphic that is covered by an opaque pixel in the card graphic. In other words, put a single black dot in a corner of the background picture, then make sure that for card pictures that need to stay partly or completely opaque, there is an opaque pixel over that black dot. This should block HyperCard from changing the transparency of card pictures. ====== jeanne a. e. devoto ================================================= Usenet: jdevoto@apple.com | You may not distribute this article under a jdevoto@well.UUCP | compilation copyright without my permission. ____________________________________________________________________________ Disclaimer: I doubt anyone in Apple Corporate | CI$ 72411,165 knows what Usenet is, let alone what I post. |