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Author Topic: Image quality  (Read 8472 times)

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helios

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Image quality
« on: December 11, 2006, 05:59:02 PM »

Hi,

I am having problems with scene png quality. The png is really fine, the quality is as I would it to be, but when I run the game, it´s not that good. It´s like there is an "image export quality" that I am missing.

Is there anything like that? Any other idea why it should be happening?

Thanks,
Helios
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Mnemonic

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Re: Image quality
« Reply #1 on: December 11, 2006, 06:11:36 PM »

Hmm? Can you post some screenshot of what you mean? WME doesn't modify your images (other than scaling them when needed). The only known issue with PNG files is that the engine cannot read the gamma correction information some programs are saving, therefore some images may display lighter/darker than in the image editing program.
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SoundGuy

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Re: Image quality
« Reply #2 on: December 11, 2006, 07:56:39 PM »

Are you running your game in 16bit and not 32bit ?

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jlinam

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Re: Image quality
« Reply #3 on: December 11, 2006, 10:43:05 PM »

...The only known issue with PNG files is that the engine cannot read the gamma correction information some programs are saving, therefore some images may display lighter/darker than in the image editing program.

I'm curious to know: which graphics programs have had this issue? Is it just with .png's?

Thanks

PS - Sorry if this subject has been previously covered. I searched the forum for .png and found some info re: various programs having transparency issues,but nothing regarding gamma
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Mnemonic

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Re: Image quality
« Reply #4 on: December 11, 2006, 11:19:48 PM »

I'm curious to know: which graphics programs have had this issue? Is it just with .png's?
If I remember correctly this issue was found with Photoshop 8. Photoshop CS2 and Paint Shop Pro don't use the gamma correction tag (maybe odnorf will correct me).
The gamma correction tag can be removed using some PNG optimizer, such as this one.
And, yes, it only affects PNG files. It's caused by using an old version of libpng which cannot read the gamma info. There are other programs affected by this issue, for example Internet Explorer.
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jlinam

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Re: Image quality
« Reply #5 on: December 12, 2006, 12:18:09 AM »

That's useful information. Thanks!
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helios

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Re: Image quality
« Reply #6 on: December 12, 2006, 01:28:41 PM »

Hi Mnemonic,

I tried with jpg and it worked better, but I had some hard time with images that have shadows and need transparency. In the documentation I found this: "JPG images are only suitable for images without any transparent areas, i.e. you can use them to store solid background images, but DO NOT use them for sprites or other partially transparent graphics. It won't work." Anyway I tried and did not succeed.

So, my new question is, what are the tips for having maximum quality in images with effects like blurs, trasparency, shadows and gradient? What file format give more quality (having less limitations) and in what resolution (the game can handle)? As an example, Project Joe has good quality images with thos effects.


And, the images are created in Flash, so exported from there. And I´ll check that png software you told about :)


Soundguy, I am running under 32 bits. :)

Thanks,
Helios
« Last Edit: December 12, 2006, 01:35:53 PM by helios »
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Mnemonic

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Re: Image quality
« Reply #7 on: December 12, 2006, 01:39:32 PM »

I'd still like to see some screenshot, because I can't imagine what kind of problems with PNG you might possibly have. PNG format uses lossless compression, so the quality is always the same (unlike JPG).
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helios

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Re: Image quality
« Reply #8 on: December 12, 2006, 02:18:10 PM »

Ok, here it is:

The scene in the game (while running)



The png loaded to the scene.


Thanks,
Helios
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Mnemonic

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Re: Image quality
« Reply #9 on: December 12, 2006, 02:53:48 PM »

Umm, am I supposed to see any difference? Because I don't think I do :)
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metamorphium

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Re: Image quality
« Reply #10 on: December 12, 2006, 04:38:56 PM »

Mnemonic: there's a horse missing on the second image! ;)

the second has IMo higher gama correction value.
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McCoy

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Re: Image quality
« Reply #11 on: December 12, 2006, 06:05:37 PM »

I only notice a very slight brightness difference between the two. And it could be due to the gamma correction stuff Mnemonic already mentioned.

About sharpness, they both look exactly the same to my glassed eye.
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adonf

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Re: Image quality
« Reply #12 on: December 12, 2006, 06:27:05 PM »

In Mozilla the images are exactly the same, but with Internet Explorer one is slightly brighter. Not a lot but still noticeable.
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odnorf

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Re: Image quality
« Reply #13 on: December 12, 2006, 06:35:43 PM »

The two images you posted are exactly the same! The first one (the captured one) has a gamma tag but probably your screen capture program added that or you gpu drivers. That's what causing the slight brightness difference. If that's what you are meaning with "quality problems" then try to check your gpu drivers.
« Last Edit: December 12, 2006, 06:41:45 PM by odnorf »
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helios

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Re: Image quality
« Reply #14 on: December 12, 2006, 06:42:47 PM »

Metamorphium, you´re correct.
It´s really small difference, and I´ll send your replies to my project designer, who said the shadows in the ground have less quality and asked me about it.

Ok, thanks all for the help!
:)
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