I can't find a (reasonably) fast method to create an image from scratch by supplying it an array of raw RGB values (or permutations of A,R,G,B). (note: the array of raw RGB can be modified to suit the scheme supported by the method). The best I could achieve was with Imager but setpixel takes ages obviously:

my $W = 100;
my $H = 100;
# $result is a 1D array of rgb values for $Wx$H
# rgb values may actually be ARGB or RGBA etc. but I can transform
# this to suit a module
my $imager = Imager-> new(
    xsize => $W,
    ysize => $H,
    channels => 3,
) or die "called to Imager-> new() has failed.";
for my $x (0..$W){
  for my $y (0..$H){
    my $rgb = $result->[$x + $y * $W];
    next unless defined $rgb;
    # ARGB here, or any other scheme
    my $R = ($rgb & 0x00FF0000) >> 16;
    my $G = ($rgb & 0x0000FF00) >> 8;
    my $B = ($rgb & 0x000000FF);
    $imager->setpixel(x=>$x, y=>$y, color => [$R, $G, $B]);
  }
}
$imager-> write(file => 'out.png', type=>'png')

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Edit: Ideally, I would like a method which just takes in an array of RGB values and creates the image (fastly).

In reply to How to create and save an image from RGB values by bliako

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