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PNG format guide by Greg Roelofs (free!)

BMP file format @ fortunecity site

BMP file format pbourke

Organic Bit TGA file format ref

Note that although he has

typedef struct
{
    byte  identsize;          // size of ID field that follows 18 byte header (0 usually)
    byte  colourmaptype;      // type of colour map 0=none, 1=has palette
    byte  imagetype;          // type of image 0=none,1=indexed,2=rgb,3=grey,+8=rle packed

    short colourmapstart;     // first colour map entry in palette
    short colourmaplength;    // number of colours in palette
    byte  colourmapbits;      // number of bits per palette entry 15,16,24,32

    short xstart;             // image x origin
    short ystart;             // image y origin
    short width;              // image width in pixels
    short height;             // image height in pixels
    byte  bits;               // image bits per pixel 8,16,24,32
    byte  descriptor;         // image descriptor bits (vh flip bits)
    
    // pixel data follows header
    
} TGA_HEADER;

MOST COMPILERS make it:
typedef struct
{
    byte  identsize;          // size of ID field that follows 18 byte header (0 usually)
    byte  colourmaptype;      // type of colour map 0=none, 1=has palette
    byte  imagetype;          // type of image 0=none,1=indexed,2=rgb,3=grey,+8=rle packed
    byte __UNNAMED_PADDING_1;  // make next member start on 2 byte boundary

    short colourmapstart;     // first colour map entry in palette
    short colourmaplength;    // number of colours in palette
    byte  colourmapbits;      // number of bits per palette entry 15,16,24,32
    byte __UNNAMED_PADDING_2;  // make next member start on 2 byte boundary

    short xstart;             // image x origin
    short ystart;             // image y origin
    short width;              // image width in pixels
    short height;             // image height in pixels
    byte  bits;               // image bits per pixel 8,16,24,32
    byte  descriptor;         // image descriptor bits (vh flip bits)
    
    // pixel data follows header
    
} TGA_HEADER;

making the total size 20 bytes.  watch out for this in your code.
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