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Thank you so.
I'm trying this:
for(x = 0; x < imagem->w; x++)
for(y = 0; y < imagem->h; y++){
matrizRgb[x][y].r = 0.299 * getr(matrizPixel[x][y]);
matrizRgb[x][y].g = 0.587 * getg(matrizPixel[x][y]);
matrizRgb[x][y].b = 0.114 * getb(matrizPixel[x][y]);
matrizPixel[x][y] = makecol(matrizRgb[x][y].r, matrizRgb[x][y].g, matrizRgb[x][y].b);
}
and after save the new picture in gray scale, but it isn't in gray scale...