NAME

PDF::Builder::Resource::XObject::Image::PNG - support routines for PNG image library. Inherits from PDF::Builder::Resource::XObject::Image

$res = PDF::Builder::Resource::XObject::Image::PNG->new($pdf, $file, $name, %opts)

$res = PDF::Builder::Resource::XObject::Image::PNG->new($pdf, $file, $name)

$res = PDF::Builder::Resource::XObject::Image::PNG->new($pdf, $file)

Returns a PNG-image object. $pdf is the PDF object being added to, $file is the input PNG file, and the optional $name of the new parent image object defaults to PxAAA.

opts: -notrans

No transparency -- ignore tRNS chunk if provided, ignore Alpha channel
if provided.

Supported PNG types

(0) Gray scale of depth 1, 2, 4, or 8 bits per pixel (2, 4, 16, or 256 gray
    levels). 16 bps is not currently supported. Transparency via the tRNS
    chunk is allowed, unless the -notrans option is given.

(2) RGB 24-bit truecolor with 8 bits per sample (16.7 million colors). 
    16 bps is not currently supported. Transparency via the tRNS chunk is
    allowed, unless the -notrans option is given.

(3) Palette color with 1, 2, 4, or 8 bits per pixel depth (2, 4, 16, or
    256 color table entries). 16 bpp is not currently supported. Transparency
    via the tRNS chunk is allowed, unless the -notrans option is given.

(4) Gray scale of depth 8 bits per pixel plus 8 bit Alpha channel (256
    gray levels and 256 levels of transparency). 16 bpp is not currently
    supported. The Alpha channel is ignored if the -notrans option is
    given. The tRNS chunk is not permitted.

(6) RGB 24-bit truecolor with 8 bits per sample (16.7 million colors) plus
    8 bit Alpha channel (256 levels of transparency). 16 bps is not 
    currently supported. The Alpha channel is ignored if the -notrans
    option is given. The tRNS chunk is not permitted.