200       png_warning(png_ptr, msg);  in png_text_compress()
202       png_warning(png_ptr, "Unknown compression type");  in png_text_compress()
451       png_warning(png_ptr, "Invalid compression type specified");  in png_write_IHDR()
474       png_warning(png_ptr, "Invalid filter type specified");  in png_write_IHDR()
482       png_warning(png_ptr, "Invalid interlace type specified");  in png_write_IHDR()
596         png_warning(png_ptr, "Invalid number of colors in palette");  in png_write_PLTE()
603       png_warning(png_ptr,  in png_write_PLTE()
759          png_warning(png_ptr,  in png_write_sRGB()
793       png_warning(png_ptr, "Unknown compression type in iCCP chunk");  in png_write_iCCP()
807       png_warning(png_ptr,  in png_write_iCCP()
815       png_warning(png_ptr,  in png_write_iCCP()
823       png_warning(png_ptr,  in png_write_iCCP()
952          png_warning(png_ptr, "Invalid sBIT depth specified");  in png_write_sBIT()
964          png_warning(png_ptr, "Invalid sBIT depth specified");  in png_write_sBIT()
975          png_warning(png_ptr, "Invalid sBIT depth specified");  in png_write_sBIT()
1090          png_warning(png_ptr, "Invalid number of transparent colors specified");  in png_write_tRNS()
1102          png_warning(png_ptr,  in png_write_tRNS()
1117          png_warning(png_ptr,  in png_write_tRNS()
1125       png_warning(png_ptr, "Can't write tRNS with an alpha channel");  in png_write_tRNS()
1151          png_warning(png_ptr, "Invalid background palette index");  in png_write_bKGD()
1164          png_warning(png_ptr,  in png_write_bKGD()
1174          png_warning(png_ptr,  in png_write_bKGD()
1201       png_warning(png_ptr, "Invalid number of histogram entries specified");  in png_write_hIST()
1242       png_warning(png_ptr, "zero length keyword");  in png_check_keyword()
1251       png_warning(png_ptr, "Out of memory while procesing keyword");  in png_check_keyword()
1266          png_warning(png_ptr, msg);  in png_check_keyword()
1268          png_warning(png_ptr, "invalid character in keyword");  in png_check_keyword()
1283       png_warning(png_ptr, "trailing spaces removed from keyword");  in png_check_keyword()
1296       png_warning(png_ptr, "leading spaces removed from keyword");  in png_check_keyword()
1328       png_warning(png_ptr, "extra interior spaces removed from keyword");  in png_check_keyword()
1334       png_warning(png_ptr, "Zero length keyword");  in png_check_keyword()
1339       png_warning(png_ptr, "keyword length must be 1 - 79 characters");  in png_check_keyword()
1476       png_warning(png_ptr, "Empty language field in iTXt chunk");  in png_write_iTXt()
1552       png_warning(png_ptr, "Unrecognized unit type for oFFs chunk");  in png_write_oFFs()
1579       png_warning(png_ptr, "Unrecognized equation type for pCAL chunk");  in png_write_pCAL()
1684       png_warning(png_ptr, "Can't write sCAL (buffer too small)");  in png_write_sCAL_s()
1714       png_warning(png_ptr, "Unrecognized unit type for pHYs chunk");  in png_write_pHYs()
1742       png_warning(png_ptr, "Invalid time specified for tIME chunk");  in png_write_tIME()