Addendum at 3:59pm gmt -5
I just found this link to a tutorial which seems to be helping me:
Here is the passage which helps me to understand:
Some common rules for tools and selections
With the comand “ctrl + i” (or with the menu selection -> invert) you can invert a selection.
You can make a selection invisible while keeping it active, very practical because you won’t be distracted by the dotted line and you can concentrate on the retouch. Use the command “ctrl+t”
You can shrink a selection: hold down ctrl and define the section you want to remove with any of the drawing tools. The defined section will be removed from the original selection
Much in the same way, you can add to a selection by holding down the “shift”. (both of these work with the fuzzy selection tool)
You can “unselect” everyting with the command “ctrl + shift + a”.
You can move a selection with the “alt” key pressed, otherwise you cut the picture.
You can modify a selection, enlarge it, reduce it, soften it, refine it…
I just successfully posted the following to GIMPtricks tutorial on GIMP
Yesterday, Youtube would not allow me to post for some reason. I think it is necessary for me to view COMMENTS and then to post from there.
MY BIGGEST PROBLEM AT THIS VERY MOMENT IS UNDERSTANDING HOW TO TELL GIMP TO STOP doing whatever I had been doing with ellipse or lasso select and to simply revert to the way it is when I first open it (other than closing all abandoning changes and then reopening.)
I feel confident that if I persistently bang my head against this GIMP wall for enough hours, days, weeks, months, I shall eventually assemble the set of basic skills and understandings to begin to make some progress.
I viewed this yesterday in hopes of learning how to MOVE AND RESIZE a colored circle after I have created it. My chief difficulty is understanding how properly SELECT the circle. Yesterday youtube would not let me post comment. I see that I can move and rotate the LAYER itself and wonder if that is the answer to moving the image or should one seek to move image WITHIN the layer. But still I wonder if there is an easy way to RESIZE. Thanks!
Another problem I notice is that once I select a tool such as LASSO free select, I have no idea how to UNSELECT everything and stop the little line from following the cursor about (I have no idea how to UNSELECT DESELECT the tool other than to close all and discard changes and then reopen).
PERHAPS THIS LINK WILL OFFER ME SOME HELP.
I cannot understand how to UNSELECT all tools once I have something selected. My only recourse is to close all , abandoning changes, and then reopen.
I start by loading the full-sized image into gimp. But I’ll need
to work with both the full sized version and a scaled-down copy,
so the first step is Image->Duplicate to make a second copy.
(Of course, I could also use cp in the shell, then open that
file in gimp.) Then I scale the copy much smaller, 550 pixels wide.
The next step is to go back to the original image and select the
kayakers. I’ll use the simplest selection tool for this: the
rectangular selection tool, the very first tool in the gimp toolbox.
(It’s probably already selected by default when you start gimp.)
Go to the large image, and select as though you were using the
Crop tool: start at the upper left of the area you want, mouse down,
and drag down to the lower right. Gimp will draw lines to show you
the box while you’re dragging out the selection, and when you release
the mouse button, the selection is shown by a black-and-white dashed
line where the blacks and whites continuously change. In gimp
parlance, this line is called the “marching ants”.
Gimp’s selection tools aren’t as smart as crop, so you can’t change
a selection’s size easily once you’ve made it. (You can move it;
I’ll talk about that later.) So if the selection you made isn’t quite
right, click somewhere outside the marching-ants box (this will cancel
the selection) then try again, until you get the selection where you
want it. (Be careful about clicking inside the selection: if you
click inside a selection then drag, gimp moves the contents of the
selection and leaves a white rectangle behind, which is almost never
what you want. If this happens accidentally, Undo will fix it.)
When you have a selection, lots of things act a little differently in
gimp. Most filters (for instance, the brightness tools discussed in
lesson 2) will only act on the selection, not the rest of the image;
and most drawing tools won’t draw outside the selection. We’ll use
that for some useful effects later.
For now, though, what I want to do is copy the selection from the
big image, then paste it into the small image. So I copy it:
Edit->Copy, or just ctrl-C.
Now I can go to the small image, and paste it: Edit->Paste, or ctrl-V.