[magick-users] Photoshop "save for web" gif size

[Illtud Daniel]

Anthony,

I think you misunderstand. The 'dithering' is done by photoshop.
IM is acting exactly as I expect. Photoshop is doing something to
the image to make it much smaller than the .gif that IM can produce.

I was asking whether IM can so something similar - I'm guessing that
PS is increasing redundancy in the image to make LZW compress better.
In fact, going after that guess in Google comes up with this patent:

http://www.patentstorm.us/patents/7031540-description.html

"Transformation to increase the lempel-ziv compressibility of
images with minimal visual distortion"

...and I'm guessing that that's what PS is doing, and that IM
would have to find a different way of doing it if such a thing
were considered useful.

-- 
Illtud Daniel                                 illtud.daniel at llgc.org.uk
Uwch Ddadansoddwr Systemau                       Senior Systems Analyst
Llyfrgell Genedlaethol Cymru                  National Library of Wales
Yn siarad drosof fy hun, nid LlGC   -  Speaking personally, not for NLW