[SOLVED]Problem with GIMP's PNG

weeix · Post by **weeix** » Sat Sep 04, 2010 4:47 am

I used GIMP 2.6.8 to export my logo (initially from Inkscape 0.47) into a *.png file. When I open it via an image viewer, it's fine, but when I use it in the game, the resolution just dropped. I tried to configure every PNG's settings, but none seems to work.

This is my original PNG:

But when I put it in my game, it appears like this:

Here is my code:

Code: Select all

gui::IGUIImage* gprogLogo = env->addImage(
	driver->getTexture("Resources/GprogLogo.png"),core::vector2d<s32>(446,10));

Help me please

EDIT: Problem solved by using width/height that is a power of two, e.g., 1, 2, 4, 8, 16, 32, 64, 128, etc.

Jake-GR · Post by **Jake-GR** » Sat Sep 04, 2010 5:51 am

not for sure it will help? but a friend recently had an issue with exporting png's from gimp as well (looked similar to yours)
fix was to change Image->Mode from RGB to Indexed (in gimp) before saving as png

weeix · Post by **weeix** » Sat Sep 04, 2010 7:03 am

It doesn't work. The resolution is still the same.

Anyhow, thank you!

REDDemon · Post by **REDDemon** » Sat Sep 04, 2010 7:51 am

there is no problem with your logo. i can see it pretty well in irrlicht helloworld,i replaced the irrlicht logo with this one

are you running the app with a 8 bit color depth?

if there is any problem is related to your machine or to your code.

weeix · Post by **weeix** » Sat Sep 04, 2010 8:45 am

Unfortunately, not for me.

After that, I replaced my "irrlichtlogo2.png" with the original one, and..

By the way, I don't see any logo in HelloWorld Tutorial. Which Irrlicht version did you use?

REDDemon · Post by **REDDemon** » Sat Sep 04, 2010 9:15 am

I use Irrlicht 1.7.1. try different compression level on your png. the default is 9 and on me work correctly.

xDan · Post by **xDan** » Sat Sep 04, 2010 9:18 am

Try ensuring the width and height are powers of two. Some graphics cards require it.

e.g. put it in a canvas of 256x128, with the unused area as transparent.

kazymjir · Post by **kazymjir** » Sat Sep 04, 2010 11:22 am

xDan wrote:Try ensuring the width and height are powers of two. Some graphics cards require it.

e.g. put it in a canvas of 256x128, with the unused area as transparent.

Yes, you should try this sholution.
Check this thread:
http://irrlicht.sourceforge.net/phpBB2/ ... hp?t=39752

weeix · Post by **weeix** » Sat Sep 04, 2010 2:32 pm

I'm using Mobile Intel® 945E Chipset, so POT solves my problem too.

Thank you everyone!

In addition, I found that numbers like 96 or 192 are also available too. I don't know why, but it works.