Grayscale converting

Harry · 03-05-2010 05:30 PM

Is it possible to convert image in game to grayscale? Or should I convert all .gfx of mini map into bmp, then convert in eg PS to grayscale and again to gfx?

**Esenthel** · 03-05-2010 06:21 PM

yes you can lock image, change pixels, unlock
there is tutorial for manually creating images

Harry · 03-05-2010 07:22 PM

Ok. I make some changes in tutorial and now my image is convert to grayscale but only when I load gfx file without mipmaps and in A8R8G8B8 format. Is it possible to make convert with DXT5 files?

Code:

Color clr;

Flt color;

if(image.lock()) // in order to edit the texture we must first lock it

   {

      FREPD(y,image.y()) // iterate through all y's

      FREPD(x,image.x()) // iterate through all x's

      {

          clr=image.color(x,y);

          color=0.3*clr.r+0.5*clr.g+0.2*clr.b;

          image.color(x,y,Color(255,color,color,color)); // set image color at (x,y) coordinates

      }

      image.unlock(); // unlock

   }

**Esenthel** · 03-05-2010 11:32 PM

if you have source dxt image, you need to first convert it to a8r8g8b8 (Image::copy)
edit
to make mip maps work
you need to call updateMipMaps after unlock

Harry · 03-06-2010 11:23 AM

Thanks. Does convert from dxt to a8r8g8b8 and again to dxt after operations make image with lower quality than the source image?

**Esenthel** · 03-06-2010 01:47 PM

that depends on directx implementation, and if you modify the image a8r8g8b8
since your modifying the a8r8g8b8 to greyscale then the quality can get slightly worse

Harry · 03-06-2010 03:56 PM

Ok I understand, thanks.

Grayscale converting
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