Part 3:
So I called back to thank the techies for helping me to ‘kill two birds w/ one stone’ (sorry bird huggers

): ridding the carpal tunnel threat and magnifying w/o the mouse.
Then while only the phone with this sincere gratitude call, this other tech. taught me an even neater and quicker way to enlarge and reduce pixel count dimensions:
2) a. Since I personally like even further extreme magnifications for other projects besides knives, I now just hold down the Ctrl key while tapping the + key next to the 'backspace' key. This way quickly gives ‘many’ more levels of 'increased' magnifications; the mouse got booted from the house without any toxic chemicals

.
2) b. Holding down the Ctrl key while tapping the - key will likewise quickly 'reduce' the size to the next lower magnification(s) ... etc
These Ctrl key, +/- taps actually enlarge/shrink the 'entire' page which, in and of itself, can be extremely useful for other somewhat related applications besides only the.jpg section of the page.