how to enlarge an image for cropping

[raymo]

Can somebody help this poor comp illiterate great grandpa find a simple way
to enlarge my images to bring the subject closer. I have some pics with sufficient resolution to keep a sharp image with the subject much closer.
I can downsize pixelwise in Irfanview, but the image retains the same physical dimensions, I want the subject larger.
raymo

[Nikolas]

If you use drizzling when combining and processing your images you have effectively enlarged them with decent resolution. Then you can crop what you don't need.

[raymo]

Hi Nikolas, I am no longer active in AP. It is just that I have a number of images [both astro and terrestrial] in my archives that are of high enough quality that I could enlarge them significantly and they would remain sharp.
raymo

[Merlin66]

Raymo,
Have you looked at upsizing the image in Irfanview, then cropping in 3D paint ( much easier than with Irfanview).

[Nikolas]

or try this online one https://www.photoenlarger.com/

[raymo]

Thank you both, given me something to have a go at.
raymo

[Startrek]

Raymo
I open Windows photo viewer , select image then open Paint ( not 3D paint ) crop and resize

Here’s my procedure in Windows 10

How to Crop and Resize an Image using Paint

1/ Select image in Windows Photo viewer
2/ Open image in Paint
3/ Go to frame size slider bottom right and slide to 50%
4/ On top tool bar left side , press dotted rectangle above “Select”
5/ Move mouse pointer over image and draw a square or rectangle over the area you want to crop
6/ Go to top tool bar and press “Crop”
7/ Image will be cropped but remain the same frame size
8/ To resize , press “Resize” and type in 50% for Horizontal and Vertical boxes
9/ Then select “Save As” , rename
and save in original folder
10/ Image will be cropped and resized ( same image size but smaller frame size )

Cheers
Martin

[raymo]

Hi Martin, I tried the link that Nikolas posted, and it works a treat, giving you
four images produced by different algorithms, so you can choose the one you like best, simple crop and download, and that's it.
cheers raymo