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Cropping images
I am new to editing and am trying to crop a photo but cannot get it to resize to fill the screen. I am left with the cropped photo and then the cropped section just showing white.
I have tried the various options:- Current layer only; Delete cropped pixels;Allow growing;Expand from centre and shrink merged but still cannot get the cropped photo to resize to fill the screen.
When trying the various options I have to replace the previous photo exported with one of those options checked to see if the result is what I am trying to achieve.
How do I crop a photo so that the cropped image fills the screen?
Is there a way to preview the cropped photo without having to export it?
Thanks for your help
Probably more than a crop required, and also some unknowns.

1. Do you know the size of your computer screen in pixels ? You can get that from the computer/ monitor specification
Take a screenshot, open in Gimp the screensize is shown in the top bar:

2. You can set the crop tool to a fixed size and move the tool around for a best crop:

3. Chances are the image is either too large or too small. Scale the image so that one side is an exact fit and the other is larger than required: So this one, The target is 1920x1080 and I scale to 1920x1435 pix

4. Now I can make a best possible crop from the image:

5. PreView ? What will it look like as a desktop background ?
Make sure the image scale is set to 100% View -> Zoom -> 100%
The TAB key hides the docks
F11 (View -> Full Screen) does just that Still a bit of window decoration but close enough.
Back out with F11 then TAB

Edit: I might have gone over the top with that description Wink
In Gimp the crop tool has "Delete cropped pixels" off by default. Enable that.
Instead of Fixed Size set the crop tool to Fixed Aspect Ratio. Same setting as fixed size (say 1920x1080) but now the crop area is adjustable.
hit the Ctrl key and stay on it while mouse wheel up, the picture will get bigger, roll the mouse wheel down to smaller size
Or click that icon on the top right corner

Not sure I understand the question.

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