There's a certain threshold for readability - one of the sources of  
visual confusion, a basic strategy for making captchas, is to have  
visual shapes of similar luminosity and similar size/shape overlaid  
on each other.  Ironically, it can hit humans harder than OCR  
programs, since computers can see as fine-grained differences as the  
image can store.  Having the opaque background completely eliminates  
the background noise, but it also eliminates the background info - it  
obstructs our view of the game map behind it, and of the context in  
which the unit is speaking; which is a useful reason to have these  
transparent (outside of the whole "looks cool" factor).

I saw a clever solution to this, recently - this is the same problem  
that transparent terminals always have (the parallels here are  
actually very strong, since in both wesnoth and trans terminals,  
we're reading text over a noisy background); having them transparent  
makes your desktop and underlying applications visible, but makes the  
terminal rather difficult to read.  A linux software package called  
beryl implemented the clever idea of blurring the background info  
that is seen through the window, which makes the window content much  
more visible.

http://www.beryl-project.org/images/blur_full.jpg


Unfortunately, I don't see us coding that here any time soon.

Without a blur, I'd gun for ~75% opacity in the interests of  
legibility.  If we ever code it and could display it with a blur, we  
could go as low as 50%, perhaps.

On Jun 13, 2007, at 4:02 PM, Nils Kneuper wrote:

> Eric S. Raymond schrieb:
>> We're tuning the degree of transparency in the popup transient
>> windows, and need artists' eyes for best judgment on what level looks
>> right.
>>
>> The SVN repo now has the following images:
>>
>>     images/dialogs/translucent-background_70.png
>>     images/dialogs/translucent-background_75.png
>>     images/dialogs/translucent-background_80.png
>>
>> Please link each of these in turn to images/dialogs/translucent- 
>> background.png
>> and tell us which version you think looks best.
>>
> I did also create some screenshots, though ingame it does look a  
> little
> "brighter" than on the screenshots. So please test it ingame. You can
> see the screenshots I made over here:
> http://www.wesnoth.org/files/transparancy_sshots/
>  From how it looks ingame I do vote for
> images/dialogs/translucent-background_80.png as image used to determin
> dialog transparancy.
> Cheers,
> Nils Kneuper aka Ivanovic
>
> _______________________________________________
> Wesnoth-dev mailing list
> [email protected]
> https://mail.gna.org/listinfo/wesnoth-dev


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