How to improve the picture quality?

Use blender to create a scene, but into the project, the picture is very fuzzy.
How to improve the picture quality.
thanks

From tutorial11:

Code:



   // The following instruction change the default mipmap
   // algorithm used for the images tagged to receive mipmapping
   //
   //   SIO2_IMAGE_NORMAL (no filtering)
   //   SIO2_IMAGE_LINEAR
   //   SIO2_IMAGE_BILINEAR
   //   SIO2_IMAGE_TRILINEAR
   //   SIO2_IMAGE_QUADLINEAR
   //
   sio2->tfilter = SIO2_IMAGE_BILINEAR;
   
   // Enable or disable anisotropic
   // filtering of your texture.
   //
   // SIO2_IMAGE_ISOTROPIC (no anisotropic filtering)
   // SIO2_IMAGE_ANISOTROPIC_1X
   // SIO2_IMAGE_ANISOTROPIC_2X
   sio2->afilter = SIO2_IMAGE_ANISOTROPIC_1X;



sio2interactive wrote:From tutorial11:

Code:



   // The following instruction change the default mipmap
   // algorithm used for the images tagged to receive mipmapping
   //
   //   SIO2_IMAGE_NORMAL (no filtering)
   //   SIO2_IMAGE_LINEAR
   //   SIO2_IMAGE_BILINEAR
   //   SIO2_IMAGE_TRILINEAR
   //   SIO2_IMAGE_QUADLINEAR
   //
   sio2->tfilter = SIO2_IMAGE_BILINEAR;
   
   // Enable or disable anisotropic
   // filtering of your texture.
   //
   // SIO2_IMAGE_ISOTROPIC (no anisotropic filtering)
   // SIO2_IMAGE_ANISOTROPIC_1X
   // SIO2_IMAGE_ANISOTROPIC_2X
   sio2->afilter = SIO2_IMAGE_ANISOTROPIC_1X;



thanks,but,In my project do not change. Sio2 engine in the most suitable map size is how much? 512x512?

thanks sio2,I have to try
Resolution of the picture which is more suitable. thank you !