Instead of using an image editor I’m just resizing the UV map and have the image texture node set to Extension: Clip.
How can I change the black area outside of the image to be white?
You should be able to use image’s Alpha channel - it’s all black outside the bounds:
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Doesn’t Alpha output of image give you exact mask?
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…i needed some time to understand this… ( and so i just post this here to memorize this better 
).So basicly the clipped area is also producing a mask… which can be used to mix with any other shader or texture… or color…
Usually the alpha channel of any decal (object) is used to mix with a trasnparent shader (and then maybe backed)… but for some simple “just add this here”–use case this is… just simpler…
…really nnnice … 
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I don’t know why I have to look at this post every other week to remember this 
Save the material setup into your startup file. Once you have it right there easily available, you will be able to remember it anyway…
lol… Hoomans 
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give it a nice name like : UDA
write it down on a stickers note on your monitor, you will see it for a while even if you don’t need it and think why you did that, it will stick in your memory
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