Scanning period LW photos for digital archive

[Flying_pencil]

Some advice from the wise members here.

I am working on scanning in the photos I have collected over the years.
While I have scanned a portion, I want to make sure I am using best practices.


I use 2400 DPI scanners and scan to the maximum.
Afterward I re-sample down to 1200 DPI, as this produces more accurate 1200 DPI images instead of doing it 1200 (as the source has a finer details so the interpolation, the average area result, is more accurate, IIRC).
This is to save space and work times (big files, long action times).

I also save as PNG
JPEG is a "lossy" format, throws data away to reduce file size. Great for web, email, publishing, not good for archive of original.

I tried TIFF, but there is actually no standard, so certain file information is not understood or used by programs, causing problems.
I even use GIF in grey scale, it will have 256 shades of grey that make for great images and very small files (but on closeup the 256 pixelation does show a bit).

Easy comparison of files here

How Photoshop advises on re-sizing (scroll down 1/4 way)
see:

• Changing the pixel dimensions affects the physical size but not the resolution.
• Changing the resolution affects the pixel dimensions but not the physical size.
• Changing the physical size affects the pixel dimensions but not the resolution.

What do you do any why?