1966      ping_background,  in ReadOnePNGImage()  local
2366   (void) png_get_bKGD(ping, ping_info, &ping_background);  in ReadOnePNGImage()
2759                         background.index=ping_background->index;  in ReadOnePNGImage()
2811         ping_background->red *= bkgd_scale;  in ReadOnePNGImage()
2812         ping_background->green *= bkgd_scale;  in ReadOnePNGImage()
2813         ping_background->blue *= bkgd_scale;  in ReadOnePNGImage()
2821                  ping_background->red,ping_background->green,  in ReadOnePNGImage()
2822                  ping_background->blue,  in ReadOnePNGImage()
2823                  bkgd_scale,ping_background->red,  in ReadOnePNGImage()
2824                  ping_background->green,ping_background->blue);  in ReadOnePNGImage()
2828             ScaleShortToQuantum(ping_background->red);  in ReadOnePNGImage()
2831             ScaleShortToQuantum(ping_background->green);  in ReadOnePNGImage()
2834           ScaleShortToQuantum(ping_background->blue);  in ReadOnePNGImage()
7928     ping_background,  in WriteOnePNGImage()  local
8091   ping_background.red = 0;  in WriteOnePNGImage()
8092   ping_background.green = 0;  in WriteOnePNGImage()
8093   ping_background.blue = 0;  in WriteOnePNGImage()
8094   ping_background.gray = 0;  in WriteOnePNGImage()
8095   ping_background.index = 0;  in WriteOnePNGImage()
8686                ping_background.index = i;  in WriteOnePNGImage()
8802          ping_background.index +=  in WriteOnePNGImage()
9572        ping_background.red=(png_uint_16)  in WriteOnePNGImage()
9575        ping_background.green=(png_uint_16)  in WriteOnePNGImage()
9578        ping_background.blue=(png_uint_16)  in WriteOnePNGImage()
9581        ping_background.gray=(png_uint_16) ping_background.green;  in WriteOnePNGImage()
9590           (int) ping_background.index);  in WriteOnePNGImage()
9673           if (IsPNGColorEqual(ping_background,image->colormap[i]))  in WriteOnePNGImage()
9676         ping_background.index=(png_byte) i;  in WriteOnePNGImage()
9682                  (int) ping_background.index);  in WriteOnePNGImage()
10183          ping_background.gray=(png_uint_16) ((maxval/65535.)*  in WriteOnePNGImage()
10192              (int) ping_background.index);  in WriteOnePNGImage()
10224         ping_background.index=(png_byte) i;  in WriteOnePNGImage()
10240                         (int) ping_background.red,  in WriteOnePNGImage()
10241                         (int) ping_background.green,  in WriteOnePNGImage()
10242                         (int) ping_background.blue);  in WriteOnePNGImage()
10677           png_set_bKGD(ping,ping_info,&ping_background);  in WriteOnePNGImage()
10684                         (int) ping_background.red,  in WriteOnePNGImage()
10685                         (int) ping_background.green,  in WriteOnePNGImage()
10686                         (int) ping_background.blue);  in WriteOnePNGImage()
10689                         (int) ping_background.index,  in WriteOnePNGImage()
10690                         (int) ping_background.gray);  in WriteOnePNGImage()