Xion Audio Player

Skin appears darker than inside of Photoshop

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Postby Lance » September 1st, 2013, 6:23 am

Long and boring story short, it's come to my attention that a skin applied to Xion is overall slightly darker in tones than when the skin is open in Photoshop. It's very subtle but it's easy to see if you screenshot your skin in use and layer it over top of the PSD. It's even easier to tell with dark skins.

I'm sure nearly everyone will say "so what", but it's actually becoming a bit of a nuisance for me. I wouldn't know where to begin in explaining why it's happening, only thought I have would be a difference in bitdepth? Is that even a factor for Xion? I'm using the standard 8bit RGB in PS.

Anyways, I've tested this with a bunch of skins from different authors and used a color picker to be certain. And nope, my Xion transparency isn't set to 99%.

Sgoingon?
I made the Xion Default skin. Ask me questions and stuff.

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Postby regener8ed » September 1st, 2013, 12:33 pm

interesting.

out of curiosity, i made some reference patches and it's not just a simple matter of darkening -- while Xion seldom renders a value of 255, it also seems to never render a value of zero.

(PSD): Xion
(255,255,255): 255,254,254
(255,0,0): 255,1,1
(255,255,0): 254,254,1
(0,255,0): 2,255,2
(0,255,255): 1,254,254
(0,0,255): 2,1,254
(255,0,255): 255,2,255
(0,0,0): 2,1,2
Image
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Postby SLoB » September 1st, 2013, 6:33 pm

Are you using CC Lance? As they are now using the GPU direct for rendering, that could explain some other subtle differences? Whereas Xion is still using software rendering until Cliff adds in the hardware rendering. There was a quick demo (not public demo version) of the hardware rendering a fair while back.
IF the above is the case then it will be the gfx card settings either ATI/Nvidia differences, possibly most notable dithering and vibrance?
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Postby SLoB » September 1st, 2013, 6:37 pm

Hmm, while I think of it, would be cool if Xion could make use of mapping images such as specular & bump maps to give some extra life to things ;)
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Postby Cliff Cawley » September 1st, 2013, 8:51 pm

Hi all,

This will be due to the optimizations used for rendering in software mode. There are some inaccuracies introduced which allow for greater speed.

I'll add this to the Todo list to verify, but I'm fairly sure this is the case.

Cliff :)
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Postby Lance » September 1st, 2013, 10:49 pm

Not using CC myself SLoB.

I toggled my Nvidia settings, namely the "let other other applications control color" but it makes no difference whether enabled or disabled.

Cliff seems to have explained it though so that's fine. Out of interest, how much of a speed difference is there without optimizing?
I made the Xion Default skin. Ask me questions and stuff.

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Postby Cliff Cawley » September 4th, 2013, 3:00 pm

A considerable different. It's the difference between float and int operations.

I'll take a look when a get a chance though, it's possible a bug has snuck in :)
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