If you save your images to CD as regular data you will not modify the image in any way by copying it to CD. You are somehow making the image small in PSP.
I also use Irfanview as my default viewer, but it isn’t nearly as good a tool for what you are doing as PSP.
Select the crop tool. Click on “Presets” and select a standard print size. In the first example I selected 8 X 10 horizontal. You can also put any size in the width and height boxes if you don’t want a standard print size.
The crop box will maintain the proper proportions for your print. As you adjust your crop box the way you want it you will notice the resolution will change according to the size of the box. That tells you what quality print you can get. In the first screenshot my resolution for the particular 8 X 10 crop ended up as 252.16 pixels/inch. You will notice that changes as you resize the crop box.
I find you get a pretty good print at 150 PPI and I can’t see any improvement over about 240 PPI regardless of whether I use a photo printer or print commercially. With a little work in the image editor I have printed 120 PPI images that looked decent, but more resolution would give better prints. Some subject matter requires higher resolutions and prints that will not be viewed up close can have lower resolution. You need to learn to relate your requirements to the listed resolution.
The second attachment shows another way to use the crop tool. The boxes are showing the actual pixels in the crop area. The reason I show it is that the resolution shown in this display is meaningless and should be ignored. Many people are confused by this default resolution. The resolution is meaningless until you set a print size.
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How do I crop a picture or even save a picture that I can print out at sizes larger than a 4x6?
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Always save the original. You can also save modified and cropped images, but the original is your digital negative. If you are putting images on a CD to take to be printed you want them cropped to the proper proportions. But if you want to crop to a different size you should revert back to the original.