This image is 256 x 192 which is not an official Amstrad screen mode. It sounds like a SNES or GBA mode. Are we sure this is a CPC screenshot?
::No, take a look at https://goo.gl/images/UU9Ik6 in 256 the calculations are a lot of faster! -- [[User:Polluks|Polluks]] ([[User talk:Polluks|talk]]) 15:08, 6 May 2017 (EDT)