GIMP transparency seems to behave differently from transparency after being exported to a png file.
If you take a look at the attachment. When creating a circle shaped white gradient, and creating a background layer with the left half being grey and the right half being fully transparent.
Then export to a png file and display in front of the same grey background, you get a different result. 
Is there a colour option or setting that can be changed to "fix" this behaviour?
I have also tried in Paint.net and it behaves the same as png alpha.

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I would like to know how to resize my photos of my artwork so that their true shape (some are tall and narrow or long and narrow landscapes) fit into the Instagram 4x5 image ratio (I think that's what you call it) I would not mind if there would be white borders on the sides of my images. Without re-scaling my images, Instagram crops or reshapes them. Thank you for any info you can offer me.

I have a large pile of color slides, most taken 45-50 years ago, on either Ektachrome or Fujichrome.

although they've been stored in boxes that keep them in the dark, the colors of many have faded, the amount seems rather variable. (there is also a good bit of dust/dirt, that I'm not going to mess with unless I can also improve the image's colors to something closer to original.)

I'm looking for ways t try to return at least some of the vitality they had when new, but am sufficiently ignorant of complex photo processing that I haven't a clue where to start.

I've tried messing with curves, contrast, hue/ etc but can't get anything I like the looks of.

Can any of you suggest things I could (learn to) do to retain at least some of the original verve?

I'm attaching an example of one of the slides.

Fredex

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Sorry, super basic question here.

I'm trying to make an animated brush. When I export in Grayscale mode, I'm able to change the color, but it fills in the background so I get a bunch of different-sized squares. When I export in RGB mode, I get my images just fine but of course I can't change the brush color.

All the tutorials I can find cover either animated brushes OR color changing but not both, lol. How do I fix this?

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 I am not sure what I have done here.  I was attempting to remove some very faint graph marks on an image.  I used the select by color.  I then tried to delete what I had selected.  Instead I got this kind of ghost image.  I tried to move it and indeed it appeared to be a outline of what I was trying to get rid of.  But now it won't go away.   I even shut the program completely down, but it is still there.   I have attached a screen shot and the actual file.

I am new to the forum and to Gimp.  
I am trying to create a printable grid.  I found the pattern grid but its units are only in pixels.  I know that in my drawing an 1/8th inch is 37.5 pixels.  But fractions are not allowed.  Is there a way to create a printable 1/8th inch grid?  I suppose a half of a pixel may not be worth effort, but I'd like to know if there is another way to do this.

Thanks!

Pos

Say
1. I want to change the area in white to red (the action)
2. *except* the selected square
I know how to do 1. with "By color select", but not 1. and 2. combined. Could someone make a suggestion?

More generally, how can I exclude a selection from an action?

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CanNot Move object (Mouse Action Blocked)
via mouse cursor
 Rotate Icon
(Did not ask for)

OK... see attached file below, then (sigh)

How the heck do I get rid of it?

What did I do (so I do NOT do it again)

Thanks, folks!
PS
Any other gotchyas I need to know,
before I encounter
 & lose my mind?

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So this is a simplified command that is having the same issue 

It runs the gimp-console executable but it does not seem to actually run any of the code inside -b argument.

This line below simply attempts to close the gimp console window but it simply hangs at "batch command executed successfully"

Any help would be appreciated!

Update Below

Hi. I'm sorta new using GIMP. I've run into an issue that I was hoping someone with more experience could shed some light on. I am trying to curve text to a circle. This has worked excellent until recently. I am running GIMP 2.10.20 on a Windows 10 64-bit machine. I'm 1) creating a circle, 2) select to path, 3) creating the text (Sans-Serif, 29 px) and 4) text along path. Changing font doesn't seem to help much. Any suggestions or answers as to why this is happening is welcome. 

Thx,
Gary J.