PngHeader

The first chunk in a PNG file is a header that contains this info

struct PngHeader {

ubyte compressionMethod;

ubyte filterMethod;

ubyte interlaceMethod;

}

Members

Variables

compressionMethod ubyte compressionMethod;: should be zero
depth ubyte depth;: This is bits per channel - per color for truecolor or grey and per pixel for palette.
filterMethod ubyte filterMethod;: should be zero
height uint height;: Height of the image, in pixels.
interlaceMethod ubyte interlaceMethod;: 0 is non interlaced, 1 if Adam7. No more are defined in the spec
type ubyte type;: Types from the PNG spec: 0 - greyscale 2 - truecolor 3 - indexed color 4 - grey with alpha 6 - true with alpha
width uint width;: Width of the image, in pixels.

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Source

See Implementation