2 deleted 17 characters in body
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This seems to work as well:

img = Import["https://i.stack.imgur.com/Epzrz.png"];
highlighted = ColorReplace[img, White -> Yellow, $MachineEpsilon]

Mathematica graphics

I tried checked whether it worked by running

Binarize[img, 1 - $MachineEpsilon]; + highlighted

after which all the yellow pixels were washed out (became white), which I think shows that the right pixels were highlighted.

This seems to work as well:

img = Import["https://i.stack.imgur.com/Epzrz.png"];
highlighted = ColorReplace[img, White -> Yellow, $MachineEpsilon]

Mathematica graphics

I tried checked whether it worked by running

Binarize[img, 1 - $MachineEpsilon]; + highlighted

after which all the yellow pixels were washed out (became white), which I think shows that the right pixels were highlighted.

This seems to work as well:

img = Import["https://i.stack.imgur.com/Epzrz.png"];
highlighted = ColorReplace[img, White -> Yellow, $MachineEpsilon]

Mathematica graphics

1
source | link

This seems to work as well:

img = Import["https://i.stack.imgur.com/Epzrz.png"];
highlighted = ColorReplace[img, White -> Yellow, $MachineEpsilon]

Mathematica graphics

I tried checked whether it worked by running

Binarize[img, 1 - $MachineEpsilon]; + highlighted

after which all the yellow pixels were washed out (became white), which I think shows that the right pixels were highlighted.