Have 600And400dpi Tif and Jpeg. Can I change to less dpi?

[SyncroScales]

Hi. Using PSPP X3 Ultimate.

I have some Tif files and jpeg files that are 600dpi and 400dpi. I scanned these images with my Canon CanoScan LiDE 700F scanner. Can i use my version of PSPP X3 Ultimate to change the dpi value? Is this stuck? I wanted to be able to get the 600 and 400 dpi image files (I have some 300dpi's too) down to the 100-250 range if I needed to. I see there are different export options and compression in PSPPX3Ultimate, but I'm not sure if this will do what I want.

I want to export as Tif and Jpeg again.

Are there any good third party photo and or video editors that I can batch edit this with? It's ok to mention pay programs (please say so) and I'd prefer good quality freeware if there is such a thing. I am sure that my Corel program can do the trick though. I just don't know how and don't want to rescan multiple dpi's every single time. I only need the archives and then get the smaller dpi when needed.

[teknisyan]

You can use the resize feature of PSP X3, you can go to IMAGE > RESIZE,

[SyncroScales]

Thank you very much Abiel Corel NA. It worked well.