Re: Scanning Suggestions (Bookmarks & Colour)

[Paul Koning via cctalk]

> On Aug 27, 2021, at 8:32 PM, Paul Koning via cctalk <cctalk@classiccmp.org> 
> wrote:
> 
> ...
> 
>> It turns out though that if you drive it with a computer then you also get 
>> the choice of TIFF or PNG as additional choices. TIFF is likely to be quite 
>> a bit too big. I'll try PNG and see how big the files it generates are. I've 
>> no idea what the default compression is straight out of the software but as 
>> long as it's lossless I can hopefully post-process to squeeze things down if 
>> possible.
> 
> TIFF is (normally) lossless.  I think PNG also, or at least can be, but I 
> don't understand it as well.

I should have checked first, but at least now I know: yes, PNG is lossless, it 
uses Deflate compression.  And TIFF is also lossless, with a variety of 
compression schemes.  In particular, it is the way to go for bitonal images 
with the CCITT compression scheme, which is specifically optimized for that 
case.  

        paul