Testing ImageMagick conversion rate for JPEG photos

Quality	Settings	300x200		900x600		1600x1067		1800x1200		total
Maximum (worst)		19444	%	124000	%	330333	%	398270	%	872047	%
75 ?	None	14505	25.40	90327	27.16	233731	29.24	280521	29.57	619084	27.84
75 ?	Interlace	14493	25.46	88843	28.35	232264	29.69	279510	29.82	615110	28.33
75 ?	Sampling factor	11432	41.21	70735	42.96	179709	45.60	215033	46.01	476909	43.95
75 ?	Sampling factor + Interlace	11356	41.60	69178	44.21	176552	46.55	211682	46.85	468768	44.80
80 ?	None	16520	15.04	103970	16.15	272595	17.48	327853	17.68	720938	16.59
80 ?	Interlace	16405	15.63	102143	17.63	270318	18.17	325550	18.26	714416	17.42
80 ?	Sampling factor	12875	33.78	80500	35.08	206295	37.55	247488	37.86	547158	36.07
80 ?	Sampling factor + Interlace	12697	34.70	78452	36.73	202499	38.70	243335	38.90	536983	37.26
85 ?	None	19444	0.00	124000	0.00	330333	0.00	398270	0.00	872047	0.00
85 ?	Interlace	19147	1.53	121638	1.90	326084	1.29	393819	1.12	860688	1.46
85 ?	Sampling factor	14872	23.51	94438	23.84	245593	25.65	295518	25.80	650421	24.70
85 ?	Sampling factor + Interlace	14610	24.86	91654	26.09	239804	27.41	288810	27.48	634878	26.46