. . . "ancillary chunks" . . . . . . "Portable Network Graphics" . . "PNG images" . . "PNG File format" . . . "Portable Network Graphics#Optimizing tools" . . . . . "PNG file format" . . . . . . . . . . "pngs" . . . . . . . "IDAT chunk" . "PNG format" . . . . "Png" . . "Portable Network Graphics (PNG)" . . . . . "PNG alpha channel" . . . "Portable Network Graphics" . . "PNG interlacing" . . . "chunks" . . . . "png" . . . "Portable Network Graphics: File header" . "PNGs" . . . "PNG files" . . . "PNG" . "Paeth filter" . . . . . "IDAT data stream" . . "PNG image" . ".png" . "Portable Network Graphics#Filtering" . "PNG8" . . . . . "portable network graphics" . . "PNG bKGD" . . . . . . ".PNG" . "png images" . . . . .