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Than you could simply:

curl https://i.sstatic.net/xvbHP.png |
  perl -e 'use GD;GD::Image->trueColor(1);$i=GD::Image->newFromPng(
      STDIN);my($x,$y)=$i->getBounds();for my$k(0..$x-1){for my$l(0
      ..$y-1){$_.=pack"UUU",$i->rgb($i->getPixel($k,$l))};};eval'

You could simply:

curl https://i.sstatic.net/xvbHP.png |
  perl -e 'use GD;GD::Image->trueColor(1);$i=GD::Image->newFromPng(
      STDIN);my($x,$y)=$i->getBounds();for my$k(0..$x-1){for my$l(0
      ..$y-1){$_.=pack"UUU",$i->rgb($i->getPixel($k,$l))};};eval'

or, with arguments (You have to add -s switch to perl command):

wget -O - http://fhauri.cartou.ch/ascii-clock/ascii-clock.png |
  perl -se 'use GD;GD::Image->trueColor(1);$i=GD::Image->newFromPng(
      STDIN);my($x,$y)=$i->getBounds();for my$k(0..$x-1){for my$l(0
      ..$y-1){$_.=pack"UUU",$i->rgb($i->getPixel($k,$l))};};eval' -- -a 18

Let another perl version!!!

Ok, this require having gd2-perl installed. But you could replace curl by wget -O - ;-)

One more another perl version!!!

This require having gd2-perl installed! (You could replace curl by wget -O - ;-)

This version is strongly linked to this other answer, with the main advantage: You could run this quietly, for a while! So you could find an upgraded version there or on this ascii-clock for geeks web page.

This version is strongly linked to this other answer, with the main advantage: You could run this quietly, for a while! So you could find an upgraded version there or on this ascii-clock for geeks web page.