PNG File Comments
PNG has MMX optimized code for load/save and supports comments as well. The following comments are supported:
| Value | Meaning | 
| CMNT_SZARTIST | [0] Person who created the image. | 
| CMNT_SZCOPYRIGHT | [1] Copyright notice. | 
| CMNT_SZDATETIME | [2] Date and time (YYYY:MM:DD HH:MM:SS). The field length is 20, counting the NULL terminator. | 
| CMNT_SZDESC | [3] Description of the image. | 
| CMNT_SZMAKE | [5] Manufacturer of the equipment used to create the image. | 
| CMNT_SZTITLE | [175] Title of the image. | 
| CMNT_SZSOFTWARE | [9] Name and version of software package used to create the image. | 
| CMNT_SZDISCLAIMER | [176] String containing the disclaimer of the software used to create the image. | 
| CMNT_SZWARNING | [177] Warning statement associated with the software that created the image. | 
| CMNT_MISC | [178] Miscellaneous information. |