Let explain in new conference to ease retrieval.

0. create the directory SmathFile in C:\
1. download the *.bmp [Doublet]
2. save the Doublet.bmp in C:\SmathFile\Doublet

At this point, the Image READ COLOR SmathGraph should read Doublet in same document.
Observe how the Doublet is saved and recovered in the 1/1 ratio.
It is saved the same in the PDF ... Adobe opens the *.PDF in default zoom 85%.
You can zoom down [10%, 20% ...] and observe just smaller look.
Zoom 100% ... 1/1 original Smath.

The story starts here: zoom up [200%, 300%, 400% ...]
that corresponds to pixelation factors [(2,2), (3,3), (4,4) ...]
This is duplicate/triplicate/quadruplicate ... pixels population.
That is the only thing Adobe can do as a freeware.

If you would want the image zoomed in the Photoshop style, Adobe needs
a minimalist Fourier system. All that to say Smath has nothing to do
back in reading an *.PDF document. To understand what is simple pixelation,
the attached document demonstrates it, but in 20 minutes my laptop is still
pedaling in the butter.
For your interest, I have an Smath document that illustrates/explains the
Fourier zoom RGB. There are other techniques not demonstrable in Smath.

Please, do not hesitate for any question. Adobe supports zoom up/down
letters, glyphes ... else that are HTML coded, thus the nice zoomed up
Smath equations, program modules.

Image READ COLOR SamthGraph.sm (53 KiB) downloaded 68 time(s).