selecting a fixed size rectangular area

[bwaggybear]

Hi, 
I'm using Gimp 3.0.2 revision 1 and I'm trying to produce something like a colour swatch like paint companies have.

I've got all my colour values (120 of them) and what I am trying to do now is select a fixed size rectangular area in varoius positions across the image.
I have found the menu related to the rectangular selection tool, that offers Fixed Aspect Ratio, Fixed Width, Fixed Height  and Fixed Size and ticked the box next to the fixed Size Option. 

The size to select that I have selected is 160px by 80 px. (It seems that this needs to be set before selecting the fixed size option) But when I try to do the selection by mouse it always reverts to a 100px by 100px square selection.

When I look at the other options in the menu they are all set as well. It seems I cannot set one without setting all the others. Am I doing something wrong?
Cheers
Andy

[Ofnuts]

Are you setting the fixed size at the right place?

   

[denzjos]

(04-18-2025, 01:39 PM)Ofnuts Wrote: Are you setting the fixed size at the right place?

Ofnuts, thanks for this tip. I never used it because I didn't know it could be done in Gimp. Always learning....

[bwaggybear]

(04-18-2025, 01:39 PM)Ofnuts Wrote: Are you setting the fixed size at the right place?

OK 
I was setting the size from the 2 size boxes, rather than the box immediately underneath the menu. I thought the numbers in this box were autogenerated. Now I know I can edit them, 
Thanks
btw what are the two separate size boxes lower down actually for?
Andy

[rich2005]

(10 hours ago)bwaggybear Wrote: ...snip...
btw what are the two separate size boxes lower down actually for?
Andy

...so you can accurately define a position and a size for your selection. The crop tool is the same.