[Hue vs Paint Bucket]

For Example - Changing the text colours of a word that is on a transparent background to a specific hex value using the paint bucket will more often than not distort part of the text. But if you go to Adjustments > Hue / Saturation you can change the colours "without the distortion"

So my question is there a way to set the hex color there, because at the moment you have 3 settings to work with Hue / Saturation / Lightness, and you can change that to come very close to the color that you want, but not always.

 

I hope this makes sense - Although it may be a dumb question (Sorry I am a newbie)

[Bending (Curve) part of an image]

Good Day

 

I will appreciate if someone can explain to me how to do this in Paint.net (if it is possible at all), or maybe suggest a plugin that will help me out.

 

Image A is the "original" and I want to curve part of the image so that the end result looks something like Image B.

 

Sorry if this is a stupid question, I am a Paint.net newbie