IGUIImage converts good qualitiy into bad :(

Peter Müller · Post by **Peter Müller** » Thu Mar 25, 2004 8:40 pm

Look at these pictures:

Image:

Menu:

I loaded the picture with setImage().
Can I load also good qualitiy with IGUIImage?[/img]

saigumi · Post by **saigumi** » Thu Mar 25, 2004 9:06 pm

Use images in sizes of base2 or quality will go down as the texture is loaded into video memory.

It also looks like your getting some majorly poor diffusion. Irrlicht used to load all textures in 16 bit mode even when video was set to 32 bit. There is a fix floating around here to fix it in 0.5 , but I thought that Niko corrected it in 0.6.

Ranix · Post by **Ranix** » Fri Mar 26, 2004 7:18 am

I'm having the exact same problem. The texture quality doesn't change when I switch the video mode from 16 to 32 bit.

Any help would be appreciated.

Ranix · Post by **Ranix** » Fri Mar 26, 2004 7:30 am

It looks like the quality of loaded images (.jpg, .gif) degrades SEVERELY when rendered with DirextX but it's perfect with OpenGL. OpenGL hates fonts though! What's a guy to do?

Software rendering runs these 2d elements fine, though...

Peter Müller · Post by **Peter Müller** » Fri Mar 26, 2004 4:21 pm

@saigumi:

Use images in sizes of base2 or quality will go down as the texture is loaded into video memory.

How? Is it described in the documentation (I didn't look it up so far)?

Tyn · Post by **Tyn** » Fri Mar 26, 2004 8:32 pm

To the power of two, he means. 2x2, 2x2x2, 2x2x2x2 etc. The X and Y of your pic should be to the power of two because textures load better at that size. That's why most people jam loads of small images into a 256x256 texture.

Guest · Post by **Guest** » Fri Mar 26, 2004 8:46 pm

Oh, yea, I understand.
You mean textures with eg. 128x128, 256x256, 512x512 pixles? But do you real think, this will increase the quality?

But I'll trie it. Thanks!

Guest · Post by **Guest** » Sat Mar 27, 2004 9:22 am

Well, it definatly does. The optimum size is 256x256 or lower, you seem to lose quality when you use sizes of 512x512 or bigger, I don't know why. It's not a problem of Irrlicht, any textures you make for any game ( that I have seen ) need this, I think it is something to do with the way graphics are stored in the 3D cards memory.

Peter Müller · Post by **Peter Müller** » Sat Mar 27, 2004 2:04 pm

I got it!
You must set driver->setTextureCreationFlag(USE_ALWAYS_32BIT, true) und disable OPTIMIZE_FOR_SPEED and USE_ALWAYS_16BIT).

Thanks to all who helped me!

Cleves · Post by **Cleves** » Sat Mar 27, 2004 4:03 pm

Then what?
You can load every size you want without losing picture quailty?

rt · Post by rt » Sat Mar 27, 2004 5:14 pm

[subliminal message]use PNG images[/subliminal message]

http://irrlicht.sourceforge.net/phpBB2/ ... .php?t=517

Peter Müller · Post by **Peter Müller** » Sun Mar 28, 2004 11:43 am

@cleves:
I think it increased the quality, but I'm not sure. Perhaps I only thought it