The source for the statement that it's disrespectful is Taz, Orach Chaim 621:2 (and from there in Kitzur Shulchan Aruch 6:3). He writes:


  ועוד יש ללמוד מדברים הנזכרים כאן
  דבמקום שאין אנו רוצים להזכיר שם של
  אדנות י"ל השם, ולא כמ"ש המון עם אדושם,
  כי אין זה דרך כבוד של מעלה, אלא י"ל
  כלשון התנא השם


So it sounds like he's saying that the only acceptable substitute is "Hashem," as found in the Mishnah (Yoma 3:8, 4:2, 6:2) and in the Yom Kippur Avodah. If I understand his reasoning correctly, the point is that the substitute word itself has to somehow express respect for the Divine Name, as "Hashem" does (since it means "the Name [which we are not allowed to say in this context]." By contrast, a word like "Adoshem," while it avoids the problem of saying G-d's Name in vain, isn't a respectful substitute, since it has no meaning.

According to that, then, "Amonai" might also be problematic.

What's wrong with using "Adoshem" for the name of G-d when singing?
I have an image with a few shades of grey in it. I need to change some of those shades into white. Is there anything more efficient than going through each pixel one by one and check its RGB values? Is it perhaps possible to somehow posterize the image with some built-in function?
