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text on transparent window

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Posted by Retnur   (9 posts)  [Biography] bio
Date Fri 19 Nov 2010 11:35 PM (UTC)  [ quote  ]
Message
I'm drawing text on a transparent layer. Because of blending with the color that's transparent the text looks a little off. Ie not solid color and doesn't blend well with the layer below the text.


Is there any reasonable solution to this other than drawing the text on lower layers or using a small background color?
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Posted by Twisol   USA  (2,229 posts)  [Biography] bio
Date Reply #1 on Fri 19 Nov 2010 11:53 PM (UTC)  [ quote  ]

Amended on Fri 19 Nov 2010 11:54 PM (UTC) by Twisol

Message
Could you post an image and/or code? It's a little difficult to visualize the problem from just what you've said.

May as well try a shot in the dark, though... Maybe you could try creating a fade mask according to the technique(s) described in this thread: http://www.gammon.com.au/forum/?id=10530
'Soludra' on Achaea

Blog: http://jonathan.com/
GitHub: http://github.com/Twisol
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Posted by Retnur   (9 posts)  [Biography] bio
Date Reply #2 on Sat 20 Nov 2010 04:29 AM (UTC)  [ quote  ]
Message
http://www.flickr.com/photos/56084432@N05/5191277774/
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Posted by Nick Gammon   Australia  (18,770 posts)  [Biography] bio   Forum Administrator
Date Reply #3 on Sat 20 Nov 2010 05:41 AM (UTC)  [ quote  ]
Message
I presume you are talking about the word "priest" or "test" or whatever it is in the middle?

How are you drawing it? Just straight text onto the window?
- Nick Gammon

www.gammon.com.au, www.mushclient.com
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Posted by Retnur   (9 posts)  [Biography] bio
Date Reply #4 on Sat 20 Nov 2010 06:08 AM (UTC)  [ quote  ]
Message
I have a transparent flagged window on top of the other layers for text. I'm using WindowText() on that layer. For various reasons I can't draw reliably on the layers under that. Yet I want the text legible. Is there any solution for this?
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Posted by Twisol   USA  (2,229 posts)  [Biography] bio
Date Reply #5 on Sat 20 Nov 2010 06:55 AM (UTC)  [ quote  ]
Message
Have you tried a dropshadow? Also, try applying a weak fade mask to the area right behind the text before you draw it.
'Soludra' on Achaea

Blog: http://jonathan.com/
GitHub: http://github.com/Twisol
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Posted by Nick Gammon   Australia  (18,770 posts)  [Biography] bio   Forum Administrator
Date Reply #6 on Sat 20 Nov 2010 06:58 AM (UTC)  [ quote  ]
Message
There is always a solution. However it may involve trade-offs. Speed. Memory. Complexity. Visibility. Coding time.

Drawing text on a busy background is always going to be a challenge. Personally I wouldn't have a transparent window on top of another one, I think that just adds a layer of complexity. For one thing, what if you want to move it? Also, the transparency is either on or off, giving you a sharp edge.

One approach would be to "punch out" the background, perhaps by drawing the text in white over the background, perhaps offset one pixel up and left, and then one pixel down and right. Then draw the black text on top in the middle.

Or, fade the background a bit with a blended in rectangle, lowering the intensity of the background. Or more simply, just block out the background with black, white, gray, yellow or whatever, and draw the text on that.

What could look nice is blending in a soft-edged rectangle onto the main window, giving a black background to the text, but without the hard borders.
- Nick Gammon

www.gammon.com.au, www.mushclient.com
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