I import the photo into an illustrating program called CorelDraw. Adobe Illustrator is another...there are all kinds of freeware versions out there as well. Once the photo is imported then I can draw anything I want on top as well as create and size text. It's probably not the most practical program to use but I have it on my computer and use it for other stuff so it's already familiar to me.
New injectors are undeniably "crisper"... even my wife noticed it after I did the swap. You can hear the solenoids snapping under the valve covers (it's like a perpetual buzz test), which I find interesting: Anytime you can hear the solenoids over the injector, the injector noise is under control. That being said, I still have one loud injector I'm going to swap out with my 9th injector. They all run beautifully, but the truck is so quiet I can easily pin down a single injector knock - and where it's at (#7) with the valve covers on.
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