What about WEBP?
…https://www.garfnet.org.uk/cms/wp-content/gallery/00000000-test-gallery/BBC_Testcard_W_1080_Lines.png 714.9 kiB https://www.garfnet.org.uk/cms/wp-content/gallery/00000000-test-gallery/BBC_Testcard_W_1080_Lines_lo.jpg 215.5 kiB https://www.garfnet.org.uk/cms/wp-content/gallery/00000000-test-gallery/BBC_Testcard_W_1080_Lines.jpg 437.4 kiB https://www.garfnet.org.uk/cms/wp-content/gallery/00000000-test-gallery/BBC_Testcard_W_1080_Lines.webp 100.9 kiB https://www.garfnet.org.uk/cms/wp-content/gallery/00000000-test-gallery/BBC_Testcard_W_1080_Lines_lossless.webp 406.9 kiB Just to put this all into perspective: the file sizes of the above picture as…